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Chuang YT, Lin TY, Tan GH, Jan PE, Lin HC, Chen HM, Hsiao KY, Chen BH, Lu CH, Lee CH, Pao CW, Yang SD, Lu MY, Lin HW. Highly Efficient MAPbI 3-Based Quantum Dots Exhibiting Unusual Nonblinking Single Photon Emission at Room Temperature. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024; 20:e2308676. [PMID: 38072780 DOI: 10.1002/smll.202308676] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2023] [Revised: 11/17/2023] [Indexed: 05/03/2024]
Abstract
Highly emissive semiconductor nanocrystals, or so-called quantum dots (QDs) possess a variety of applications from displays and biology labeling, to quantum communication and modern security. Though ensembles of QDs have already shown very high photoluminescent quantum yields (PLQYs) and have been widely utilized in current optoelectronic products, QDs that exhibit high absorption cross-section, high emission intensity, and, most important, nonblinking behavior at single-dot level have long been desired and not yet realized at room temperature. In this work, infrared-emissive MAPbI3-based halide perovskite QDs is demonstrated. These QDs not only show a ≈100% PLQY at the ensemble level but also, surprisingly, at the single-dot level, display an extra-large absorption cross-section up to 1.80 × 10-12 cm2 and non-blinking single photon emission with a high single photon purity of 95.3%, a unique property that is extremely rare among all types of quantum emitters operated at room temperature. An in-depth analysis indicates that neither trion formation nor band-edge carrier trapping is observed in MAPbI3 QDs, resulting in the suppression of intensity blinking and lifetime blinking. Fluence-dependent transient absorption measurements reveal that the coexistence of non-blinking behavior and high single photon purity in these perovskite QDs results from a significant repulsive exciton-exciton interaction, which suppresses the formation of biexciton, and thus greatly reduces photocharging. The robustness of these QDs is confirmed by their excellent stability under continuous 1 h electron irradiation in high-resolution transmission electron microscope inspection. It is believed that these results mark an important milestone in realizing nonblinking single photon emission in semiconductor QDs.
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Affiliation(s)
- Yung-Tang Chuang
- Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, 30013, Taiwan
| | - Tzu-Yu Lin
- Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, 30013, Taiwan
| | - Guang-Hsun Tan
- Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, 30013, Taiwan
| | - Pei-En Jan
- Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, 30013, Taiwan
| | - Hao-Cheng Lin
- Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, 30013, Taiwan
| | - Hung-Ming Chen
- Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, 30013, Taiwan
| | - Kai-Yuan Hsiao
- Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, 30013, Taiwan
| | - Bo-Han Chen
- Institute of Photonics Technologies, National Tsing Hua University, Hsinchu, 30013, Taiwan
| | - Chih-Hsuan Lu
- Institute of Photonics Technologies, National Tsing Hua University, Hsinchu, 30013, Taiwan
| | - Chi-Hsuan Lee
- Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei, 106319, Taiwan
| | - Chun-Wei Pao
- Research Center for Applied Sciences, Academia Sinica, Taipei, 11529, Taiwan
| | - Shang-Da Yang
- Institute of Photonics Technologies, National Tsing Hua University, Hsinchu, 30013, Taiwan
| | - Ming-Yen Lu
- Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, 30013, Taiwan
| | - Hao-Wu Lin
- Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, 30013, Taiwan
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2
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Shulenberger KE, Sherman SJ, Jilek MR, Keller HR, Pellows LM, Dukovic G. Exciton and biexciton transient absorption spectra of CdSe quantum dots with varying diameters. J Chem Phys 2024; 160:014708. [PMID: 38174790 DOI: 10.1063/5.0179129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2023] [Accepted: 12/04/2023] [Indexed: 01/05/2024] Open
Abstract
Transient absorption (TA) spectroscopy of semiconductor nanocrystals (NCs) is often used for excited state population analysis, but recent results suggest that TA bleach signals associated with multiexcitons in NCs do not scale linearly with exciton multiplicity. In this manuscript, we probe the factors that determine the intensities and spectral positions of exciton and biexciton components in the TA spectra of CdSe quantum dots (QDs) of five diameters. We find that, in all cases, the peak intensity of the biexciton TA spectrum is less than 1.5 times that of the single exciton TA spectrum, in stark contrast to a commonly made assumption that this ratio is 2. The relative intensities of the biexciton and exciton TA signals at each wavelength are determined by at least two factors: the TA spectral intensity and the spectral offset between the two signals. We do not observe correlations between either of these factors and the particle diameter, but we find that both are strongly impacted by replacing the native organic surface-capping ligands with a hole-trapping ligand. These results suggest that surface trapping plays an important role in determining the absolute intensities of TA features for CdSe QDs and not just their decay kinetics. Our work highlights the role of spectral offsets and the importance of surface trapping in governing absolute TA intensities. It also conclusively demonstrates that the biexciton TA spectra of CdSe QDs at the band gap energy are less than twice as intense as those of the exciton.
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Affiliation(s)
| | - Skylar J Sherman
- Department of Chemistry, University of Colorado Boulder, 215 UCB, Boulder, Colorado 80309, USA
| | - Madison R Jilek
- Department of Chemistry, University of Colorado Boulder, 215 UCB, Boulder, Colorado 80309, USA
| | - Helena R Keller
- Materials Science and Engineering, University of Colorado Boulder, 613 UCB, Boulder, Colorado 80303, USA
| | - Lauren M Pellows
- Department of Chemistry, University of Colorado Boulder, 215 UCB, Boulder, Colorado 80309, USA
| | - Gordana Dukovic
- Department of Chemistry, University of Colorado Boulder, 215 UCB, Boulder, Colorado 80309, USA
- Materials Science and Engineering, University of Colorado Boulder, 613 UCB, Boulder, Colorado 80303, USA
- Renewable and Sustainable Energy Institute (RASEI), University of Colorado Boulder, 027 UCB, Boulder, Colorado 80309, USA
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Dou H, Yuan C, Zhu R, Li L, Zhang J, Weng TC. Impact of Surface Trap States on Electron and Energy Transfer in CdSe Quantum Dots Studied by Femtosecond Transient Absorption Spectroscopy. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 14:34. [PMID: 38202489 PMCID: PMC10780555 DOI: 10.3390/nano14010034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2023] [Revised: 10/30/2023] [Accepted: 10/30/2023] [Indexed: 01/12/2024]
Abstract
The presence of surface trap states (STSs) is one of the key factors to affect the electronic and optical properties of quantum dots (QDs), however, the exact mechanism of how STSs influence QDs remains unclear. Herein, we demonstrated the impact of STSs on electron transfer in CdSe QDs and triplet-triplet energy transfer (TTET) from CdSe to surface acceptor using femtosecond transient absorption spectroscopy. Three types of colloidal CdSe QDs, each containing various degrees of STSs as evidenced by photoluminescence and X-ray photoelectron spectroscopy, were employed. Time-resolved emission and transient absorption spectra revealed that STSs can suppress band-edge emission effectively, resulting in a remarkable decrease in the lifetime of photoelectrons in QDs from 17.1 ns to 4.9 ns. Moreover, the investigation of TTET process revealed that STSs can suppress the generation of triplet exciton and effectively inhibit band-edge emission, leading to a significant decrease in TTET from CdSe QDs to the surface acceptor. This work presented evidence for STSs influence in shaping the optoelectronic properties of QDs, making it a valuable point of reference for understanding and manipulating STSs in diverse QDs-based optoelectronic applications involving electron and energy transfer.
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Affiliation(s)
- Hongbin Dou
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China; (H.D.); (L.L.); (J.Z.)
- Center for Transformative Science, ShanghaiTech University, Shanghai 201210, China
| | - Chunze Yuan
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China; (H.D.); (L.L.); (J.Z.)
- Center for Transformative Science, ShanghaiTech University, Shanghai 201210, China
| | - Ruixue Zhu
- Center for Transformative Science, ShanghaiTech University, Shanghai 201210, China
| | - Lin Li
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China; (H.D.); (L.L.); (J.Z.)
- Center for Transformative Science, ShanghaiTech University, Shanghai 201210, China
| | - Jihao Zhang
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China; (H.D.); (L.L.); (J.Z.)
- Center for Transformative Science, ShanghaiTech University, Shanghai 201210, China
| | - Tsu-Chien Weng
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China; (H.D.); (L.L.); (J.Z.)
- Center for Transformative Science, ShanghaiTech University, Shanghai 201210, China
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Cai J, Liu AA, Shi XH, Fu H, Zhao W, Xu L, Kuang H, Xu C, Pang DW. Enhancing Circularly Polarized Luminescence in Quantum Dots through Chiral Coordination-Mediated Growth at the Liquid/Liquid Interface. J Am Chem Soc 2023; 145:24375-24385. [PMID: 37883809 DOI: 10.1021/jacs.3c09448] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2023]
Abstract
Here, we develop a novel methodology for synthesizing chiral CdSe@ZnS quantum dots (QDs) with enhanced circularly polarized luminescence (CPL) by incorporating l-/d-histidine (l-/d-His) ligands during ZnS shell growth at the water/oil interface. The resulting chiral QDs exhibit exceptional absolute photoluminescence quantum yield of up to 67.2%, surpassing the reported limits of 40.0% for chiral inorganic QDs, along with absorption dissymmetry factor (|gabs|) and luminescence dissymmetry factor (|glum|) values of 10-2, exceeding the range of 10-5-10-3 and 10-4-10-2, respectively. Detailed investigations of the synthetic pathway reveal that the interface, as a binary synthetic environment, facilitates the coordinated ligand exchange and shell growth mediated by chiral His-Zn2+ coordination complexes, leading to a maximum fluorescent brightness and chiroptical activities. The growth process, regulated by the His-Zn2+ coordination complex, not only reduces trap states on the CdSe surface, thereby enhancing the fluorescence intensity, but also significantly promotes the orbital hybridization between QDs and chiral ligands, effectively overcoming the shielding effect of the wide bandgap shell and imparting pronounced chirality. The proposed growth pathway elucidates the origin of chirality and provides insights into the regulation of the CPL intensity in chiral QDs. Furthermore, the application of CPL QDs in multilevel anticounterfeiting systems overcomes the limitations of replication in achiral fluorescence materials and enhances the system's resistance to counterfeiting, thus opening new opportunities for chiral QDs in optical anticounterfeiting and intelligent information encryption.
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Affiliation(s)
- Jiarong Cai
- State Key Laboratory of Medicinal Chemical Biology, Tianjin Key Laboratory of Biosensing and Molecular Recognition, Frontiers Science Center for New Organic Matter, Research Center for Analytical Sciences, College of Chemistry, Frontiers Science Center for Cell Responses, Engineering Research Center of Thin Film Optoelectronics Technology, Ministry of Education, School of Materials Science and Engineering, Smart Sensing Interdisciplinary Science Center, Haihe Laboratory of Sustainable Chemical Transformations, Nankai University, Tianjin 300071, China
| | - An-An Liu
- State Key Laboratory of Medicinal Chemical Biology, Tianjin Key Laboratory of Biosensing and Molecular Recognition, Frontiers Science Center for New Organic Matter, Research Center for Analytical Sciences, College of Chemistry, Frontiers Science Center for Cell Responses, Engineering Research Center of Thin Film Optoelectronics Technology, Ministry of Education, School of Materials Science and Engineering, Smart Sensing Interdisciplinary Science Center, Haihe Laboratory of Sustainable Chemical Transformations, Nankai University, Tianjin 300071, China
| | - Xue-Hui Shi
- State Key Laboratory of Medicinal Chemical Biology, Tianjin Key Laboratory of Biosensing and Molecular Recognition, Frontiers Science Center for New Organic Matter, Research Center for Analytical Sciences, College of Chemistry, Frontiers Science Center for Cell Responses, Engineering Research Center of Thin Film Optoelectronics Technology, Ministry of Education, School of Materials Science and Engineering, Smart Sensing Interdisciplinary Science Center, Haihe Laboratory of Sustainable Chemical Transformations, Nankai University, Tianjin 300071, China
| | - Haohao Fu
- State Key Laboratory of Medicinal Chemical Biology, Tianjin Key Laboratory of Biosensing and Molecular Recognition, Frontiers Science Center for New Organic Matter, Research Center for Analytical Sciences, College of Chemistry, Frontiers Science Center for Cell Responses, Engineering Research Center of Thin Film Optoelectronics Technology, Ministry of Education, School of Materials Science and Engineering, Smart Sensing Interdisciplinary Science Center, Haihe Laboratory of Sustainable Chemical Transformations, Nankai University, Tianjin 300071, China
| | - Wei Zhao
- State Key Laboratory of Medicinal Chemical Biology, Tianjin Key Laboratory of Biosensing and Molecular Recognition, Frontiers Science Center for New Organic Matter, Research Center for Analytical Sciences, College of Chemistry, Frontiers Science Center for Cell Responses, Engineering Research Center of Thin Film Optoelectronics Technology, Ministry of Education, School of Materials Science and Engineering, Smart Sensing Interdisciplinary Science Center, Haihe Laboratory of Sustainable Chemical Transformations, Nankai University, Tianjin 300071, China
| | - Liguang Xu
- State Key Laboratory of Food Science and Technology, International Joint Research Laboratory for Biointerface and Biodetection, School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, China
| | - Hua Kuang
- State Key Laboratory of Food Science and Technology, International Joint Research Laboratory for Biointerface and Biodetection, School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, China
| | - Chuanlai Xu
- State Key Laboratory of Food Science and Technology, International Joint Research Laboratory for Biointerface and Biodetection, School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, China
| | - Dai-Wen Pang
- State Key Laboratory of Medicinal Chemical Biology, Tianjin Key Laboratory of Biosensing and Molecular Recognition, Frontiers Science Center for New Organic Matter, Research Center for Analytical Sciences, College of Chemistry, Frontiers Science Center for Cell Responses, Engineering Research Center of Thin Film Optoelectronics Technology, Ministry of Education, School of Materials Science and Engineering, Smart Sensing Interdisciplinary Science Center, Haihe Laboratory of Sustainable Chemical Transformations, Nankai University, Tianjin 300071, China
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5
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Sun H, Zhou P, Su B. Electrochemiluminescence of Semiconductor Quantum Dots and Its Biosensing Applications: A Comprehensive Review. BIOSENSORS 2023; 13:708. [PMID: 37504107 PMCID: PMC10377090 DOI: 10.3390/bios13070708] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Revised: 06/26/2023] [Accepted: 07/03/2023] [Indexed: 07/29/2023]
Abstract
Electrochemiluminescence (ECL) is the chemiluminescence triggered by electrochemical reactions. Due to the unique excitation mode and inherent low background, ECL has been a powerful analytical technique to be widely used in biosensing and imaging. As an emerging ECL luminophore, semiconductor quantum dots (QDs) have apparent advantages over traditional molecular luminophores in terms of luminescence efficiency and signal modulation ability. Therefore, the development of an efficient ECL system with QDs as luminophores is of great significance to improve the sensitivity and detection flux of ECL biosensors. In this review, we give a comprehensive summary of recent advances in ECL using semiconductor QDs as luminophores. The luminescence process and ECL mechanism of semiconductor QDs with various coreactants are discussed first. Specifically, the influence of surface defects on ECL performance of semiconductor QDs is emphasized and several typical ECL enhancement strategies are summarized. Then, the applications of semiconductor QDs in ECL biosensing are overviewed, including immunoassay, nucleic acid analysis and the detection of small molecules. Finally, the challenges and prospects of semiconductor QDs as ECL luminophores in biosensing are featured.
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Affiliation(s)
- Hui Sun
- Key Laboratory of Excited-State Materials of Zhejiang Province, Institute of Analytical Chemistry, Department of Chemistry, Zhejiang University, Hangzhou 310058, China
| | - Ping Zhou
- Key Laboratory of Excited-State Materials of Zhejiang Province, Institute of Analytical Chemistry, Department of Chemistry, Zhejiang University, Hangzhou 310058, China
| | - Bin Su
- Key Laboratory of Excited-State Materials of Zhejiang Province, Institute of Analytical Chemistry, Department of Chemistry, Zhejiang University, Hangzhou 310058, China
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Karmakar S, Das TK, Kalarikkal N, Saha A. A Simplified Approach for the Aqueous Synthesis of Luminescent CdSe/ZnS Core/Shell Quantum Dots and Their Applications in Ultrasensitive Determination of the Biomarker 3-Nitro-l-tyrosine. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:15995-16003. [PMID: 36512759 DOI: 10.1021/acs.langmuir.2c02459] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
In contrast to the hot-injection organometallic routes, synthesizing stable and highly luminescent core/shell nanocrystals with encapsulation of biocompatible groups through an aqueous route is a long-standing challenge. In recent years, relatively high quantum efficiency and unique properties of core/shell nanostructured materials (quantum dots) have contributed toward enhancement in sensing capability. The present work reports a facile aqueous synthesis process of core/shell CdSe/ZnS quantum dots (QDs) with encapsulation of glutathione (GSH). The optimal conditions for the synthesis of the most stable particles were ascertained, and the different experimental analyses suggest that the stable core/shell QDs in question have good crystallinity with a size around 4.7 nm with a shell thickness of 0.7 nm and a photoluminescence quantum yield of about 35%. Further, it is demonstrated that the as-synthesized material has great potential in detecting as low as 0.28 nM 3-nitro-l-tyrosine (3-NT), an important marker for oxidative stress, the level of which in our body signals several chronically diseased conditions. The enthalpy-driven interactions of CdSe/ZnS-GSH QDs with 3-NT were characterized through steady-state and time-resolved luminescence spectroscopy and isothermal microcalorimetry. The devised method of probing 3-NT was further validated with human serum samples. Thus, the proposed strategy may provide a protocol for selective determination of 3-NT under different pathological conditions.
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Affiliation(s)
- Sudip Karmakar
- UGC-DAE Consortium for Scientific Research, Kolkata Centre, III/LB-8 Bidhannagar, Kolkata700106, India
| | - Tushar Kanti Das
- UGC-DAE Consortium for Scientific Research, Kolkata Centre, III/LB-8 Bidhannagar, Kolkata700106, India
| | - Nandakumar Kalarikkal
- School of Pure and Applied Physics, Mahatma Gandhi University, Kottayam686560, Kerala, India
| | - Abhijit Saha
- UGC-DAE Consortium for Scientific Research, Kolkata Centre, III/LB-8 Bidhannagar, Kolkata700106, India
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7
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Duncan TV, Bajaj A, Gray PJ. Surface defects and particle size determine transport of CdSe quantum dots out of plastics and into the environment. JOURNAL OF HAZARDOUS MATERIALS 2022; 439:129687. [PMID: 36104913 DOI: 10.1016/j.jhazmat.2022.129687] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2022] [Revised: 07/22/2022] [Accepted: 07/25/2022] [Indexed: 05/26/2023]
Abstract
Polymers incorporating quantum dots (QDs) have attracted interest as components of next-generation consumer products, but there is uncertainty about how these potentially hazardous materials may impact human health and the environment. We investigated how the transport (migration) of QDs out of polymers and into the environment is linked to their size and surface characteristics. Cadmium selenide (CdSe) QDs with diameters ranging from 2.15 to 4.63 nm were incorporated into low-density polyethylene (LDPE). Photoluminescence was used as an indicator of QD surface defect density. Normalized migration of QDs into 3% acetic acid over 15 days ranged from 13.1 ± 0.6-452.5 ± 31.9 ng per cm2 of polymer surface area. Migrated QD mass was negatively correlated to QD diameter and was also higher when QDs had photoluminescence consistent with larger surface defect densities. The results imply that migration is driven by oxidative degradation of QDs originating at surface defect sites and transport of oxidation products along concentration gradients. A semi-empirical framework was developed to model the migration data. The model supports this mechanism and suggests that QD surface reactivity also drives the relationship between QD size and migration, with specific surface area playing a less important role.
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Affiliation(s)
- Timothy V Duncan
- Center for Food Safety and Applied Nutrition, US Food and Drug Administration, Bedford Park, IL 60501, USA.
| | - Akhil Bajaj
- Illinois Institute of Technology, Bedford Park, IL 60501, USA
| | - Patrick J Gray
- Center for Food Safety and Applied Nutrition, US Food and Drug Administration, Bedford Park, IL 60501, USA
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Rosner T, Pavlopoulos NG, Shoyhet H, Micheel M, Wächtler M, Adir N, Amirav L. The Other Dimension-Tuning Hole Extraction via Nanorod Width. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:nano12193343. [PMID: 36234471 PMCID: PMC9565346 DOI: 10.3390/nano12193343] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2022] [Revised: 09/14/2022] [Accepted: 09/21/2022] [Indexed: 05/10/2023]
Abstract
Solar-to-hydrogen generation is a promising approach to generate clean and renewable fuel. Nanohybrid structures such as CdSe@CdS-Pt nanorods were found favorable for this task (attaining 100% photon-to-hydrogen production efficiency); yet the rods cannot support overall water splitting. The key limitation seems to be the rate of hole extraction from the semiconductor, jeopardizing both activity and stability. It is suggested that hole extraction might be improved via tuning the rod's dimensions, specifically the width of the CdS shell around the CdSe seed in which the holes reside. In this contribution, we successfully attain atomic-scale control over the width of CdSe@CdS nanorods, which enables us to verify this hypothesis and explore the intricate influence of shell diameter over hole quenching and photocatalytic activity towards H2 production. A non-monotonic effect of the rod's diameter is revealed, and the underlying mechanism for this observation is discussed, alongside implications towards the future design of nanoscale photocatalysts.
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Affiliation(s)
- Tal Rosner
- Schulich Faculty of Chemistry, The Russell Berrie Nanotechnology Institute, The Nancy and Stephen Grand Technion Energy Program, Technion−Israel Institute of Technology, Haifa 32000, Israel
| | - Nicholas G. Pavlopoulos
- Schulich Faculty of Chemistry, The Russell Berrie Nanotechnology Institute, The Nancy and Stephen Grand Technion Energy Program, Technion−Israel Institute of Technology, Haifa 32000, Israel
| | - Hagit Shoyhet
- Schulich Faculty of Chemistry, The Russell Berrie Nanotechnology Institute, The Nancy and Stephen Grand Technion Energy Program, Technion−Israel Institute of Technology, Haifa 32000, Israel
| | - Mathias Micheel
- Department Functional Interfaces, Leibniz Institute of Photonic Technology Jena, Albert-Einstein-Straße 9, 07745 Jena, Germany
| | - Maria Wächtler
- Department Functional Interfaces, Leibniz Institute of Photonic Technology Jena, Albert-Einstein-Straße 9, 07745 Jena, Germany
- Institute of Physical Chemistry and Abbe Center of Photonics, Friedrich Schiller University Jena, Helmholtzweg 4, 07743 Jena, Germany
- Correspondence: (M.W.); (N.A.); (L.A.)
| | - Noam Adir
- Schulich Faculty of Chemistry, The Russell Berrie Nanotechnology Institute, The Nancy and Stephen Grand Technion Energy Program, Technion−Israel Institute of Technology, Haifa 32000, Israel
- Correspondence: (M.W.); (N.A.); (L.A.)
| | - Lilac Amirav
- Schulich Faculty of Chemistry, The Russell Berrie Nanotechnology Institute, The Nancy and Stephen Grand Technion Energy Program, Technion−Israel Institute of Technology, Haifa 32000, Israel
- Correspondence: (M.W.); (N.A.); (L.A.)
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9
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Gogoi H, Pathak SS, Dasgupta S, Panchakarla LS, Nath S, Datta A. Exciton Dynamics in Colloidal CdS Quantum Dots with Intense and Stokes Shifted Photoluminescence in a Single Decay Channel. J Phys Chem Lett 2022; 13:6770-6776. [PMID: 35853205 DOI: 10.1021/acs.jpclett.2c01623] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
CdS quantum dots (QDs), synthesized by a sol-gel method, exhibit significantly Stokes shifted bright photoluminescence (PL), predominantly from the trap states. Surprisingly, the PL decay at the emission maximum is single-exponential. This is an unusual observation for as-prepared QDs and indicates a narrow distribution in the nature of trap states. A closer look reveals an additional fast component for the decays at shorter emission wavelengths, presumably due to the band edge emission, which remains elusive in the steady-state spectra. Indeed, a significantly narrower and blue-shifted emission band is observed in the decay-associated spectra. The contribution of this component to the steady-state PL intensity is shown to be overwhelmed by that of the significantly stronger trap emission. Exciton dynamics in the quantum dots is elucidated using transient absorption spectra, in which the stimulated emission is observed even at low pump power.
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Affiliation(s)
- Hemen Gogoi
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Sushil Swaroop Pathak
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Souradip Dasgupta
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | | | - Sukhendu Nath
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
- Homi Bhabha National Institute, Training School Complex, Anushaktinagar, Mumbai 400 094, India
| | - Anindya Datta
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
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10
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Marino E, Bharti H, Xu J, Kagan CR, Murray CB. Nanocrystal Superparticles with Whispering-Gallery Modes Tunable through Chemical and Optical Triggers. NANO LETTERS 2022; 22:4765-4773. [PMID: 35649039 DOI: 10.1021/acs.nanolett.2c01011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Whispering-gallery microresonators have the potential to become the building blocks for optical circuits. However, encoding information in an optical signal requires on-demand tuning of optical resonances. Tuning is achieved by modifying the cavity length or the refractive index of the microresonator. Due to their solid, nondeformable structure, conventional microresonators based on bulk materials are inherently difficult to tune. In this work, we fabricate irreversibly tunable optical microresonators by using semiconductor nanocrystals. These nanocrystals are first assembled into colloidal spherical superparticles featuring whispering-gallery modes. Exposing the superparticles to shorter ligands changes the nanocrystal surface chemistry, decreasing the cavity length of the microresonator by 20% and increasing the refractive index by 8.2%. Illuminating the superparticles with ultraviolet light initiates nanocrystal photo-oxidation, providing an orthogonal channel to decrease the refractive index of the microresonator in a continuous fashion. Through these approaches, we demonstrate optical microresonators tunable by several times their free spectral range.
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Affiliation(s)
- Emanuele Marino
- Department of Chemistry, University of Pennsylvania, 231 S. 34th Street, Philadelphia, Pennsylvania 19104, United States
| | - Harshit Bharti
- Department of Materials Science and Engineering, University of Pennsylvania, 3231 Walnut Street, Philadelphia, Pennsylvania 19104, United States
| | - Jun Xu
- Department of Materials Science and Engineering, University of Pennsylvania, 3231 Walnut Street, Philadelphia, Pennsylvania 19104, United States
| | - Cherie R Kagan
- Department of Chemistry, University of Pennsylvania, 231 S. 34th Street, Philadelphia, Pennsylvania 19104, United States
- Department of Materials Science and Engineering, University of Pennsylvania, 3231 Walnut Street, Philadelphia, Pennsylvania 19104, United States
- Department of Electrical and Systems Engineering, University of Pennsylvania, 200 S. 33rd Street, Philadelphia, Pennsylvania 19104 United States
| | - Christopher B Murray
- Department of Chemistry, University of Pennsylvania, 231 S. 34th Street, Philadelphia, Pennsylvania 19104, United States
- Department of Materials Science and Engineering, University of Pennsylvania, 3231 Walnut Street, Philadelphia, Pennsylvania 19104, United States
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11
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Jaiswal K, Girish YR, Behera P, De M. Dual Role of MoS 2 Quantum Dots in a Cross-Dehydrogenative Coupling Reaction. ACS ORGANIC & INORGANIC AU 2022; 2:205-213. [PMID: 36855472 PMCID: PMC9955124 DOI: 10.1021/acsorginorgau.1c00040] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Modern day research focuses on the development of greener and eco-friendlier protocols to fabricate biologically relevant targets with minimal waste generation. C-C bond formation reactions are of prime importance in this regard. In a typical photocatalytic hydrogen evolution reaction, three components are used, viz, catalyst, photosensitizer, and sacrificial amine donor. Among these, the photosensitizer and sacrificial amine donors are wasted at the end of the reaction. Considering these drawbacks, in this work, we have developed a methodology targeted at the utilization of sacrificial amine donors for C-H functionalization with MoS2 quantum dots (QDs) as the catalyst as well as the photosensitizer. QDs indeed emerged to be an active participant in the heterogeneous electron transfer process. This concept opens up new possibilities in the field of nanomaterial-based photomediated organic transformations without the aid of any external photosensitizers via a clean and sustainable protocol with no side product.
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Affiliation(s)
- Komal Jaiswal
- Department
of Organic Chemistry, Indian Institute of
Science, Bangalore, Karnataka 560 012, India
| | - Yarabahally R. Girish
- Centre
for Research and Innovation, School of Natural Sciences, Adichunchanagiri University, BGSIT Campus, B.G. Nagara, Mandya 571448, India
| | - Pradipta Behera
- Department
of Organic Chemistry, Indian Institute of
Science, Bangalore, Karnataka 560 012, India
| | - Mrinmoy De
- Department
of Organic Chemistry, Indian Institute of
Science, Bangalore, Karnataka 560 012, India
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12
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Suri M, Mohamed Z, Bint E Naser SF, Mao X, Chen P, Daniel S, Hanrath T. Bioelectronic Platform to Investigate Charge Transfer between Photoexcited Quantum Dots and Microbial Outer Membranes. ACS APPLIED MATERIALS & INTERFACES 2022; 14:15799-15810. [PMID: 35344337 DOI: 10.1021/acsami.1c25032] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Photosynthetic semiconductor biohybrids (PSBs) convert light energy to chemical energy through photo-driven charge transfer from nanocrystals to microorganisms that perform bioreactions of interest. Initial proof-of-concept PSB studies with an emphasis on enhanced CO2 conversion have been encouraging; however, bringing the broad prospects of PSBs to fruition is contingent on establishing a firm fundamental understanding of underlying interfacial charge transfer processes. We introduce a bioelectronic platform that reduces the complexity of PSBs by focusing explicitly on interactions between colloidal quantum dots (QDs), microbial outer membranes, and native, small-molecule redox mediators. Our model platform employs a standard three-electrode electrochemical cell with supported outer membranes of Pseudomonas aeruginosa, pyocyanin redox mediators, and semiconducting CdSe QDs dispersed in an aqueous electrolyte. We present a comprehensive electrochemical analysis of this platform via electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), and chronoamperometry (CA). EIS reveals the formation and electronic properties of supported outer membrane films. CV reveals the electrochemically active surface area of P. aeruginosa outer membranes and that pyocyanin is the sole species that performs redox with these outer membranes under sweeping applied potential. CA demonstrates that photoexcited charge transfer in this system is driven by the reduction of pyocyanin at the QD surface followed by diffusion of reduced pyocyanin through the outer membrane. The broad applicability of this platform across many bacterial species, QD architectures, and controlled environmental conditions affords the possibility to define design principles for future PSB systems to synergistically integrate concurrent advances in genetically engineered organisms and inorganic nanomaterials.
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Affiliation(s)
- Mokshin Suri
- Robert F. Smith School of Chemical and Biomolecular Engineering, Cornell University, Ithaca, New York 14853, United States
- Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853, United States
| | - Zeinab Mohamed
- Meinig School of Biomedical Engineering, Cornell University, Ithaca, New York 14853, United States
| | - Samavi Farnush Bint E Naser
- Robert F. Smith School of Chemical and Biomolecular Engineering, Cornell University, Ithaca, New York 14853, United States
| | - Xianwen Mao
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, United States
| | - Peng Chen
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, United States
| | - Susan Daniel
- Robert F. Smith School of Chemical and Biomolecular Engineering, Cornell University, Ithaca, New York 14853, United States
- Meinig School of Biomedical Engineering, Cornell University, Ithaca, New York 14853, United States
| | - Tobias Hanrath
- Robert F. Smith School of Chemical and Biomolecular Engineering, Cornell University, Ithaca, New York 14853, United States
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13
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Gutierrez IZ, Gerke C, Shen Y, Ximendes E, Silvan MM, Marin R, Jaque D, Calderón OG, Melle S, Rubio-Retama J. Boosting the Near-Infrared Emission of Ag 2S Nanoparticles by a Controllable Surface Treatment for Bioimaging Applications. ACS APPLIED MATERIALS & INTERFACES 2022; 14:4871-4881. [PMID: 35049282 PMCID: PMC8815038 DOI: 10.1021/acsami.1c19344] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Affiliation(s)
- Irene Zabala Gutierrez
- Departamento de Química en Ciencias Farmacéuticas, Universidad Complutense de Madrid, Madrid 28040, Spain
| | - Christoph Gerke
- Departamento de Química en Ciencias Farmacéuticas, Universidad Complutense de Madrid, Madrid 28040, Spain
- Nanobiology Group, Instituto Ramón y Cajal de Investigación Sanitaria, IRYCIS, Madrid 28034, Spain
| | - Yingli Shen
- NanoBIG, Facultad de Ciencias, Departamento de Física de Materiales,Universidad Autónoma de Madrid, Madrid 28049, Spain
| | - Erving Ximendes
- NanoBIG, Facultad de Ciencias, Departamento de Física de Materiales,Universidad Autónoma de Madrid, Madrid 28049, Spain
- Nanobiology Group, Instituto Ramón y Cajal de Investigación Sanitaria, IRYCIS, Madrid 28034, Spain
| | - Miguel Manso Silvan
- Facultad de Ciencias, Departamento de Física Aplicada, Universidad Autónoma de Madrid, Madrid 28049, Spain
| | - Riccardo Marin
- NanoBIG, Facultad de Ciencias, Departamento de Física de Materiales,Universidad Autónoma de Madrid, Madrid 28049, Spain
| | - Daniel Jaque
- NanoBIG, Facultad de Ciencias, Departamento de Física de Materiales,Universidad Autónoma de Madrid, Madrid 28049, Spain
- Nanobiology Group, Instituto Ramón y Cajal de Investigación Sanitaria, IRYCIS, Madrid 28034, Spain
| | - Oscar G Calderón
- Departamento de Óptica, Universidad Complutense de Madrid, Madrid 28037, Spain
| | - Sonia Melle
- Departamento de Óptica, Universidad Complutense de Madrid, Madrid 28037, Spain
| | - Jorge Rubio-Retama
- Departamento de Química en Ciencias Farmacéuticas, Universidad Complutense de Madrid, Madrid 28040, Spain
- Nanobiology Group, Instituto Ramón y Cajal de Investigación Sanitaria, IRYCIS, Madrid 28034, Spain
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14
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Lubin G, Yaniv G, Kazes M, Ulku AC, Antolovic IM, Burri S, Bruschini C, Charbon E, Yallapragada VJ, Oron D. Resolving the Controversy in Biexciton Binding Energy of Cesium Lead Halide Perovskite Nanocrystals through Heralded Single-Particle Spectroscopy. ACS NANO 2021; 15:19581-19587. [PMID: 34846120 PMCID: PMC8717625 DOI: 10.1021/acsnano.1c06624] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Understanding exciton-exciton interaction in multiply excited nanocrystals is crucial to their utilization as functional materials. Yet, for lead halide perovskite nanocrystals, which are promising candidates for nanocrystal-based technologies, numerous contradicting values have been reported for the strength and sign of their exciton-exciton interaction. In this work, we unambiguously determine the biexciton binding energy in single cesium lead halide perovskite nanocrystals at room temperature. This is enabled by the recently introduced single-photon avalanche diode array spectrometer, capable of temporally isolating biexciton-exciton emission cascades while retaining spectral resolution. We demonstrate that CsPbBr3 nanocrystals feature an attractive exciton-exciton interaction, with a mean biexciton binding energy of 10 meV. For CsPbI3 nanocrystals, we observe a mean biexciton binding energy that is close to zero, and individual nanocrystals show either weakly attractive or weakly repulsive exciton-exciton interaction. We further show that, within ensembles of both materials, single-nanocrystal biexciton binding energies are correlated with the degree of charge-carrier confinement.
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Affiliation(s)
- Gur Lubin
- Department
of Physics of Complex Systems, Weizmann
Institute of Science, Rehovot 7610001, Israel
| | - Gili Yaniv
- Department
of Molecular Chemistry and Materials Science, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Miri Kazes
- Department
of Molecular Chemistry and Materials Science, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Arin Can Ulku
- School
of Engineering, École polytechnique
fédérale de Lausanne (EPFL), Neuchâtel 2002, Switzerland
| | - Ivan Michel Antolovic
- School
of Engineering, École polytechnique
fédérale de Lausanne (EPFL), Neuchâtel 2002, Switzerland
| | - Samuel Burri
- School
of Engineering, École polytechnique
fédérale de Lausanne (EPFL), Neuchâtel 2002, Switzerland
| | - Claudio Bruschini
- School
of Engineering, École polytechnique
fédérale de Lausanne (EPFL), Neuchâtel 2002, Switzerland
| | - Edoardo Charbon
- School
of Engineering, École polytechnique
fédérale de Lausanne (EPFL), Neuchâtel 2002, Switzerland
| | - Venkata Jayasurya Yallapragada
- Department
of Physics of Complex Systems, Weizmann
Institute of Science, Rehovot 7610001, Israel
- Department
of Physics, Indian Institute of Technology
Kanpur, Kanpur 208016, India
- (V.J.Y.)
| | - Dan Oron
- Department
of Molecular Chemistry and Materials Science, Weizmann Institute of Science, Rehovot 7610001, Israel
- (D.O.)
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15
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Frazier J, Cavey K, Coil S, Hamo H, Zhang M, Van Patten PG. Rapid and Sensitive Identification and Discrimination of Bound/Unbound Ligands on Colloidal Nanocrystals via Direct Analysis in Real-Time Mass Spectrometry. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:14703-14712. [PMID: 34879204 DOI: 10.1021/acs.langmuir.1c02548] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Direct analysis in real-time mass spectrometry (DART-MS) has been applied to the characterization of colloidal nanocrystal surface ligands. The nanocrystals (NCs) in colloidal suspension were purified and deposited onto a solid substrate, and the solvent was allowed to evaporate. Ligand desorption was thermally stimulated using a temperature ramp from 30 °C up to 530 °C, and the desorbed ligands were introduced into a DART-MS instrument where metastable He atoms provide energy for ionization and fragmentation through the reaction with ambient vapors including O2 and H2O. The method allows the identification of ligand species with various functional groups, even in complex, mixed-ligand samples. Bound and unbound molecules can be distinguished based on the desorption temperature. In ideal cases, the desorption profile for a given molecule can be analyzed according to methods adapted from thermal desorption spectroscopy (TDS) to estimate desorption activation energy for NC-bound ligands. Results are presented and discussed for different nanocrystal and ligand types. The method is a promising complement to the range of existing tools for NC ligand analysis.
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Affiliation(s)
- Jared Frazier
- Department of Chemistry, Middle Tennessee State University, Murfreesboro, Tennessee 37132, United States
| | - Kevin Cavey
- Department of Chemistry, Middle Tennessee State University, Murfreesboro, Tennessee 37132, United States
| | - Sydney Coil
- Department of Chemistry, Middle Tennessee State University, Murfreesboro, Tennessee 37132, United States
| | - Helene Hamo
- Department of Chemistry, Middle Tennessee State University, Murfreesboro, Tennessee 37132, United States
| | - Mengliang Zhang
- Department of Chemistry, Middle Tennessee State University, Murfreesboro, Tennessee 37132, United States
| | - P Gregory Van Patten
- Department of Chemistry, Middle Tennessee State University, Murfreesboro, Tennessee 37132, United States
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16
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Meirovich MM, Bachar O, Nandi R, Amdursky N, Yehezkeli O. Tailoring Quantum Dot Sizes for Optimal Photoinduced Catalytic Activation of Nitrogenase. CHEMSUSCHEM 2021; 14:5410-5416. [PMID: 34612599 DOI: 10.1002/cssc.202101676] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2021] [Revised: 09/30/2021] [Indexed: 06/13/2023]
Abstract
Many efforts have been directed towards elucidating the nitrogenase structure, its biocatalytic activity, and methods to artificially activate it by external stimuli. Here, we investigated how semiconductor nanoparticles (NPs) with sizes ranging between 2.3-3.5 nm form nano-biohybrids with the nitrogenase enzyme and enable its photoinduced biocatalytic activity. We examined two homogenously synthesized quantum dots (QDs), CdS, CdSe, and two nitrogenase variants, the wild-type and a cysteine-mutated. We show that the cysteine-mutated variant does not enhance the hydrogen generation amounts, as compared with the wild type. Nevertheless, we show that the 2.3 nm-sized CdSe NPs facilitate an eightfold increase compared with larger CdSe NPs. The obtained results were investigated using electrochemical techniques, transmission electron microscopy, and further confirmed by time-resolved spectroscopic measurements, which allow us to determine the electron tranfer rate constant (kET ) of the different configurations.
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Affiliation(s)
- Matan M Meirovich
- Department of Biotechnology and Food Engineering, Technion-Israel Institute of Technology, 3200003, Haifa, Israel
| | - Oren Bachar
- Department of Biotechnology and Food Engineering, Technion-Israel Institute of Technology, 3200003, Haifa, Israel
| | - Ramesh Nandi
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, 3200003, Haifa, Israel
| | - Nadav Amdursky
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, 3200003, Haifa, Israel
| | - Omer Yehezkeli
- Department of Biotechnology and Food Engineering, Technion-Israel Institute of Technology, 3200003, Haifa, Israel
- Russell Berrie Nanotechnology Institute, Technion-Israel Institute of Technology, 3200003, Haifa, Israel
- The Nancy and Stephen Grand Technion Energy Program, Technion-Israel Institute of Technology, 3200003, Haifa, Israel
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17
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Wen H, Xu X, Cheong S, Lo SC, Chen JH, Chang SLY, Dwyer C. Metrology of convex-shaped nanoparticles via soft classification machine learning of TEM images. NANOSCALE ADVANCES 2021; 3:6956-6964. [PMID: 36132371 PMCID: PMC9417281 DOI: 10.1039/d1na00524c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Accepted: 10/11/2021] [Indexed: 06/15/2023]
Abstract
The shape of nanoparticles is a key performance parameter for many applications, ranging from nanophotonics to nanomedicines. However, the unavoidable shape variations, which occur even in precision-controlled laboratory synthesis, can significantly impact on the interpretation and reproducibility of nanoparticle performance. Here we have developed an unsupervised, soft classification machine learning method to perform metrology of convex-shaped nanoparticles from transmission electron microscopy images. Unlike the existing methods, which are based on hard classification, soft classification provides significantly greater flexibility in being able to classify both distinct shapes, as well as non-distinct shapes where hard classification fails to provide meaningful results. We demonstrate the robustness of our method on a range of nanoparticle systems, from laboratory-scale to mass-produced synthesis. Our results establish that the method can provide quantitative, accurate, and meaningful metrology of nanoparticle ensembles, even for ensembles entailing a continuum of (possibly irregular) shapes. Such information is critical for achieving particle synthesis control, and, more importantly, for gaining deeper understanding of shape-dependent nanoscale phenomena. Lastly, we also present a method, which we coin the "binary DoG", which achieves significant progress on the challenging problem of identifying the shapes of aggregated nanoparticles.
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Affiliation(s)
- Haotian Wen
- School of Materials Science and Engineering, University of New South Wales Sydney NSW 2052 Australia
| | - Xiaoxue Xu
- School of Mathematical and Physical Sciences, University of Technology, Sydney Ultimo NSW 2007 Australia
| | - Soshan Cheong
- Electron Microscope Unit, Mark Wainwright Analytical Centre, University of New South Wales Sydney NSW 2052 Australia
| | - Shen-Chuan Lo
- Material and Chemical Research Laboratories, Industrial Technology Research Institute Hsinchu Taiwan
| | - Jung-Hsuan Chen
- Material and Chemical Research Laboratories, Industrial Technology Research Institute Hsinchu Taiwan
| | - Shery L Y Chang
- School of Materials Science and Engineering, University of New South Wales Sydney NSW 2052 Australia
- Electron Microscope Unit, Mark Wainwright Analytical Centre, University of New South Wales Sydney NSW 2052 Australia
| | - Christian Dwyer
- Electron Imaging and Spectroscopy Tools PO Box 506 Sans Souci NSW 2219 Australia
- Physics, School of Science, RMIT University Melbourne Victoria 3001 Australia
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18
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Schedel C, Strauß F, Kumar K, Maier A, Wurst KM, Michel P, Scheele M. Substrate Effects on the Bandwidth of CdSe Quantum Dot Photodetectors. ACS APPLIED MATERIALS & INTERFACES 2021; 13:47954-47961. [PMID: 34605623 DOI: 10.1021/acsami.1c13581] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
We investigate the time-resolved photocurrent response of CdSe quantum dot (QD) thin films sensitized with zinc β-tetraaminophthalocyanine (Zn4APc) (Kumar , ACS Appl. Mater. Interfaces, 2019, 11, 48271-48280) on three different substrates, namely, silicon with 230 nm SiO2 dielectric, glass, and polyimide. While Si/SiO2 (230 nm) is not suitable for any transient photocurrent characterization due to an interfering photocurrent response of the buried silicon, we find that polyimide substrates invoke the larger optical bandwidth with 85 kHz vs 67 kHz for the same quantum dot thin film on glass. Upon evaluation of the transient photocurrent, we find that the photoresponse of the CdSe quantum dot films can be described as a combination of carrier recombination and fast trapping within 2.7 ns followed by slower multiple trapping events. The latter are less pronounced on polyimide, which leads to the higher bandwidth. We show that all devices are resistance-capacitance (RC)-time limited and that improvements of photoresistance are the key to further increasing the bandwidth.
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Affiliation(s)
- Christine Schedel
- Institute for Physical and Theoretical Chemistry, University of Tübingen, Tübingen 72076, Germany
| | - Fabian Strauß
- Institute for Physical and Theoretical Chemistry, University of Tübingen, Tübingen 72076, Germany
| | - Krishan Kumar
- Institute for Physical and Theoretical Chemistry, University of Tübingen, Tübingen 72076, Germany
| | - Andre Maier
- Institute for Physical and Theoretical Chemistry, University of Tübingen, Tübingen 72076, Germany
| | - Kai M Wurst
- Institute for Physical and Theoretical Chemistry, University of Tübingen, Tübingen 72076, Germany
| | - Patrick Michel
- Institute for Physical and Theoretical Chemistry, University of Tübingen, Tübingen 72076, Germany
| | - Marcus Scheele
- Institute for Physical and Theoretical Chemistry, University of Tübingen, Tübingen 72076, Germany
- Center for Light-Matter Interaction, Sensors and Analytics LISA+, University of Tübingen, Tübingen 72076, Germany
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19
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Kang X, Chaperman L, Galeckas A, Ammar S, Mammeri F, Norby T, Chatzitakis A. Water Vapor Photoelectrolysis in a Solid-State Photoelectrochemical Cell with TiO 2 Nanotubes Loaded with CdS and CdSe Nanoparticles. ACS APPLIED MATERIALS & INTERFACES 2021; 13:46875-46885. [PMID: 34570462 DOI: 10.1021/acsami.1c13047] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
In this study, polyol-made CdS and CdSe crystalline nanoparticles (NPs) are loaded by impregnation on TiO2 nanotube arrays (TNTAs) for solar-simulated light-driven photoelectrochemical (PEC) water vapor splitting. For the first time, we introduce a safe way to utilize toxic, yet efficient photocatalysts by integration in solid-state PEC (SSPEC) cells. The enabling features of SSPEC cells are the surface protonic conduction mechanism on TiO2 and the use of polymeric electrolytes, such as Nafion instead of liquid ones, for operation with gaseous reactants, like water vapor from ambient humidity. Herein, we studied the effects of both the operating conditions in gaseous ambient atmospheres and the surface modifications of TNTAs-based photoanodes with well-crystallized CdS and CdSe NPs. We showed 3.6 and 2.5 times increase in the photocurrent density of defective TNTAs modified with CdS and CdSe, respectively, compared to the pristine TNTAs. Electrochemical impedance spectroscopy and structural characterizations attributed the improved performance to the higher conductivity induced by intrinsic defects as well as to the enhanced electron/hole separation at the TiO2/CdS heterojunction under gaseous operating conditions. The SSPEC cells were evaluated by cycling between high relative humidity (RH) (80%) and low RH levels (40%), providing direct evidence of the effect of RH and, in turn, adsorbed water, on the cell performance. Online mass spectrometry indicated the corresponding difference in the H2 production rate. In addition, a complete restoration of the SSPEC cell performance from low to high RH levels was also achieved. The presented system can be employed in off-grid, water depleted, and air-polluted areas for the production of hydrogen from renewable energy and provides a solution for the safe use of toxic, yet efficient photocatalysts.
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Affiliation(s)
- Xiaolan Kang
- Centre for Materials Science and Nanotechnology, Department of Chemistry, University of Oslo, Gaustadalléen 21, NO-0349 Oslo, Norway
| | - Larissa Chaperman
- Interfaces Traitements Organisation et Dynamique des Systèmes (ITODYS), Université de Paris, 15 Rue Jean-Antoine de Baïf, 75205 Paris, France
| | - Augustinas Galeckas
- Centre for Materials Science and Nanotechnology, Department of Physics, University of Oslo, P. O. Box 1048 Blindern, NO-0316 Oslo, Norway
| | - Souad Ammar
- Interfaces Traitements Organisation et Dynamique des Systèmes (ITODYS), Université de Paris, 15 Rue Jean-Antoine de Baïf, 75205 Paris, France
| | - Fayna Mammeri
- Interfaces Traitements Organisation et Dynamique des Systèmes (ITODYS), Université de Paris, 15 Rue Jean-Antoine de Baïf, 75205 Paris, France
| | - Truls Norby
- Centre for Materials Science and Nanotechnology, Department of Chemistry, University of Oslo, Gaustadalléen 21, NO-0349 Oslo, Norway
| | - Athanasios Chatzitakis
- Centre for Materials Science and Nanotechnology, Department of Chemistry, University of Oslo, Gaustadalléen 21, NO-0349 Oslo, Norway
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20
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Mir IA, Kumar S, Bhat MA, Yuelin X, Wani AA, Zhu L. Core@shell quantum dots as a fluorescent probe for the detection of cholesterol and heavy metal ions in aqueous media. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2021.127090] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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21
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Carulli F, Pinchetti V, Zaffalon ML, Camellini A, Rotta Loria S, Moro F, Fanciulli M, Zavelani-Rossi M, Meinardi F, Crooker SA, Brovelli S. Optical and Magneto-Optical Properties of Donor-Bound Excitons in Vacancy-Engineered Colloidal Nanocrystals. NANO LETTERS 2021; 21:6211-6219. [PMID: 34260252 PMCID: PMC8397387 DOI: 10.1021/acs.nanolett.1c01818] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/20/2021] [Revised: 06/30/2021] [Indexed: 06/13/2023]
Abstract
Controlled insertion of electronic states within the band gap of semiconductor nanocrystals (NCs) is a powerful tool for tuning their physical properties. One compelling example is II-VI NCs incorporating heterovalent coinage metals in which hole capture produces acceptor-bound excitons. To date, the opposite donor-bound exciton scheme has not been realized because of the unavailability of suitable donor dopants. Here, we produce a model system for donor-bound excitons in CdSeS NCs engineered with sulfur vacancies (VS) that introduce a donor state below the conduction band (CB), resulting in long-lived intragap luminescence. VS-localized electrons are almost unaffected by trapping, and suppression of thermal quenching boosts the emission efficiency to 85%. Magneto-optical measurements indicate that the VS are not magnetically coupled to the NC bands and that the polarization properties are determined by the spin of the valence-band photohole, whose spin flip is massively slowed down due to suppressed exchange interaction with the donor-localized electron.
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Affiliation(s)
- Francesco Carulli
- Dipartimento
di Scienza dei Materiali, Università
degli Studi di Milano-Bicocca, via Cozzi 55, IT-20125 Milano, Italy
| | - Valerio Pinchetti
- Dipartimento
di Scienza dei Materiali, Università
degli Studi di Milano-Bicocca, via Cozzi 55, IT-20125 Milano, Italy
| | - Matteo L. Zaffalon
- Dipartimento
di Scienza dei Materiali, Università
degli Studi di Milano-Bicocca, via Cozzi 55, IT-20125 Milano, Italy
| | - Andrea Camellini
- Dipartimento
di Energia, Politecnico di Milano, IT-20133 Milano, Italy
| | | | - Fabrizio Moro
- Dipartimento
di Scienza dei Materiali, Università
degli Studi di Milano-Bicocca, via Cozzi 55, IT-20125 Milano, Italy
| | - Marco Fanciulli
- Dipartimento
di Scienza dei Materiali, Università
degli Studi di Milano-Bicocca, via Cozzi 55, IT-20125 Milano, Italy
| | | | - Francesco Meinardi
- Dipartimento
di Scienza dei Materiali, Università
degli Studi di Milano-Bicocca, via Cozzi 55, IT-20125 Milano, Italy
| | - Scott A. Crooker
- National
High Magnetic Field Laboratory, Los Alamos
National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Sergio Brovelli
- Dipartimento
di Scienza dei Materiali, Università
degli Studi di Milano-Bicocca, via Cozzi 55, IT-20125 Milano, Italy
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22
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Ahanger FA, Nazir N, Lone MS, Afzal S, Dar AA. Emission Color Tuning and White Light Generation from a Trimolecular Cocktail in Cationic Micellar System with Promising Applicability in the Anticounterfeiting Technology. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:7730-7740. [PMID: 34128682 DOI: 10.1021/acs.langmuir.1c00785] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The development of photoluminescent (PL) systems, displaying multiple stimuli-responsive emission color tuning, has been the pressing priority in the recent times due to their huge role in contemporary lighting and anticounterfeiting technologies. Acknowledging this importance, we present a simple and eco-friendly PL system showing emission color tuning in response to different stimuli, that is, the composition of the system, pH, excitation wavelength, and the temperature with the plus point of getting significantly pure white light emission (WLE). The novel system is fabricated from the aqueous mixture of three organic fluorophores, umbelliferone (UMB), fluorescein (FLU), and Rhodamine-B (RB). By varying the fluorophore composition in the mixture at pH 12, nearly pure WLE with a Commission Internationale d'Eclairage (CIE) 1931 profile of (0.33, 0.33) was obtained at the excitation wavelength of 365 nm, the sustainability of which was ensured by employing the micellar self-assemblies of tetradecyltrimethylammonium bromide (TTAB) molecules. Similar WLE was obtained under mildly acidic conditions (pH 6) but at the excitation wavelength of 330 nm. By proper tuning of pH and the wavelengths of the system to use it as a fluorescent ink, we found a remarkable and highly applicable phenomenon observed for the first time, that is, triple-mode orthogonal emission color tuning with white light ON/OFF switching. We validate the vital applicability of this phenomenon in protecting the authenticity of the document with its hard-to-counterfeit property. The applicability of this phenomenon is also explored by synthesizing PVA-based fluorescent films from the tri-fluorophore mixture. Moreover, the emission color of the PL system was explored lucidly for its temperature dependence owing to the thermal responsiveness of RB emission, where the PL system proves to be a full-color RGB system.
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Affiliation(s)
- Firdaus Ahmad Ahanger
- Soft Matter Research Group, Physical Chemistry Section, Department of Chemistry, University of Kashmir, Hazratbal, Srinagar 190006, J&K, India
| | - Nighat Nazir
- Department of Chemistry, Islamia College of Science and Commerce, Hawal, Srinagar 190002, J&K, India
| | - Mohd Sajid Lone
- Soft Matter Research Group, Physical Chemistry Section, Department of Chemistry, University of Kashmir, Hazratbal, Srinagar 190006, J&K, India
| | - Saima Afzal
- Soft Matter Research Group, Physical Chemistry Section, Department of Chemistry, University of Kashmir, Hazratbal, Srinagar 190006, J&K, India
| | - Aijaz Ahmad Dar
- Soft Matter Research Group, Physical Chemistry Section, Department of Chemistry, University of Kashmir, Hazratbal, Srinagar 190006, J&K, India
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Hottechamps J, Noblet T, Erard M, Dreesen L. Quenched or alive quantum dots: The leading roles of ligand adsorption and photoinduced protonation. J Colloid Interface Sci 2021; 594:245-253. [PMID: 33765644 DOI: 10.1016/j.jcis.2021.02.116] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2020] [Revised: 02/23/2021] [Accepted: 02/25/2021] [Indexed: 10/22/2022]
Abstract
HYPOTHESIS The fluorescence emission of water-soluble CdTe quantum dots (QDs) capped with mercaptocarboxylic acids (MCAs) is known to be pH-dependent. However, this behaviour is quite different from a study to another, so that literature suffers from a lack of coherence. Here we assume that the QD fluorescence efficiency is actually driven by the acid-base equilibrium of MCA thiol groups, and that light-excited QDs open a non-radiative relaxation path through photoinduced protonation. EXPERIMENTS We address this issue by examining colloidal CdTe QDs with (time-resolved) fluorescence spectroscopy under various conditions of acidity and light excitation. FINDINGS It appears that the emission of QDs is quenched below a critical pH value of 6.87, and that light excitation power strengthens this quenching. We thus demonstrate the existence of an additional photochemical process and developed a mathematical modeling accounting for all our experimental results. With only three parameters, it is possible to accurately predict the fluorescence decay of QDs over time, at any pH. Further, we also related the critical pH value of 6.87 to QD surface properties, explaining why observations may differ from a study to another and making the literature much more coherent.
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Affiliation(s)
- Julie Hottechamps
- GRASP-Biophotonics, CESAM, University of Liege, Institute of Physics, Allée du 6 août 17, 4000 Liège, Belgium
| | - Thomas Noblet
- GRASP-Biophotonics, CESAM, University of Liege, Institute of Physics, Allée du 6 août 17, 4000 Liège, Belgium
| | - Marie Erard
- Université Paris-Saclay, CNRS, Institut de Chimie Physique, UMR 8000, 91405 Orsay, France
| | - Laurent Dreesen
- GRASP-Biophotonics, CESAM, University of Liege, Institute of Physics, Allée du 6 août 17, 4000 Liège, Belgium.
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Lei L, Huang D, Chen S, Zhang C, Chen Y, Deng R. Metal chalcogenide/oxide-based quantum dots decorated functional materials for energy-related applications: Synthesis and preservation. Coord Chem Rev 2021. [DOI: 10.1016/j.ccr.2020.213715] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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25
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Huang J, Ojambati OS, Chikkaraddy R, Sokołowski K, Wan Q, Durkan C, Scherman OA, Baumberg JJ. Plasmon-Induced Trap State Emission from Single Quantum Dots. PHYSICAL REVIEW LETTERS 2021; 126:047402. [PMID: 33576645 DOI: 10.1103/physrevlett.126.047402] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2020] [Accepted: 12/18/2020] [Indexed: 06/12/2023]
Abstract
Charge carriers trapped at localized surface defects play a crucial role in quantum dot (QD) photophysics. Surface traps offer longer lifetimes than band-edge emission, expanding the potential of QDs as nanoscale light-emitting excitons and qubits. Here, we demonstrate that a nonradiative plasmon mode drives the transfer from two-photon-excited excitons to trap states. In plasmonic cavities, trap emission dominates while the band-edge recombination is completely suppressed. The induced pathways for excitonic recombination not only shed light on the fundamental interactions of excitonic spins, but also open new avenues in manipulating QD emission, for optoelectronics and nanophotonics applications.
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Affiliation(s)
- Junyang Huang
- NanoPhotonics Centre, Cavendish Laboratory, Department of Physics, University of Cambridge, Cambridge CB3 0HE, United Kingdom
| | - Oluwafemi S Ojambati
- NanoPhotonics Centre, Cavendish Laboratory, Department of Physics, University of Cambridge, Cambridge CB3 0HE, United Kingdom
| | - Rohit Chikkaraddy
- NanoPhotonics Centre, Cavendish Laboratory, Department of Physics, University of Cambridge, Cambridge CB3 0HE, United Kingdom
| | - Kamil Sokołowski
- Melville Laboratory for Polymer Synthesis, Department of Chemistry, University of Cambridge, Cambridge CB2 1EW, United Kingdom
| | - Qifang Wan
- Nanoscience Center, University of Cambridge, 11 JJ Thomson Avenue, Cambridge CB3 0FF, United Kingdom
| | - Colm Durkan
- Nanoscience Center, University of Cambridge, 11 JJ Thomson Avenue, Cambridge CB3 0FF, United Kingdom
| | - Oren A Scherman
- Melville Laboratory for Polymer Synthesis, Department of Chemistry, University of Cambridge, Cambridge CB2 1EW, United Kingdom
| | - Jeremy J Baumberg
- NanoPhotonics Centre, Cavendish Laboratory, Department of Physics, University of Cambridge, Cambridge CB3 0HE, United Kingdom
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Dzhagan V, Stroyuk O, Raievska O, Isaieva O, Kapush O, Selyshchev O, Yukhymchuk V, Valakh M, Zahn DRT. Photoinduced Enhancement of Photoluminescence of Colloidal II-VI Nanocrystals in Polymer Matrices. NANOMATERIALS (BASEL, SWITZERLAND) 2020; 10:E2565. [PMID: 33371226 PMCID: PMC7766198 DOI: 10.3390/nano10122565] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/09/2020] [Revised: 12/11/2020] [Accepted: 12/19/2020] [Indexed: 01/03/2023]
Abstract
The environment strongly affects both the fundamental physical properties of semiconductor nanocrystals (NCs) and their functionality. Embedding NCs in polymer matrices is an efficient way to create a desirable NC environment needed for tailoring the NC properties and protecting NCs from adverse environmental factors. Luminescent NCs in optically transparent polymers have been investigated due to their perspective applications in photonics and bio-imaging. Here, we report on the manifestations of photo-induced enhancement of photoluminescence (PL) of aqueous colloidal NCs embedded in water-soluble polymers. Based on the comparison of results obtained on bare and core/shell NCs, NCs of different compounds (CdSe, CdTe, ZnO) as well as different embedding polymers, we conclude on the most probable mechanism of the photoenhancement for these sorts of systems. Contrary to photoenhancement observed earlier as a result of surface photocorrosion, we do not observe any change in peak position and width of the excitonic PL. Therefore, we suggest that the saturation of trap states by accumulated photo-excited charges plays a key role in the observed enhancement of the radiative recombination. This suggestion is supported by the unique temperature dependence of the trap PL band as well as by power-dependent PL measurement.
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Affiliation(s)
- Volodymyr Dzhagan
- V. Lashkaryov Institute of Semiconductors Physics, National Academy of Sciences of Ukraine, 01601 Kyiv, Ukraine; (O.I.); (O.K.); (V.Y.); (M.V.)
- Department of Physics, Taras Shevchenko National University of Kyiv, 64 Volodymyrs’ka St., 01601 Kyiv, Ukraine
| | - Oleksandr Stroyuk
- Forschungszentrum Julich GmbH, Helmholtz-Institut Erlangen Nürnberg für Erneuerbare Energien (HI ERN), Immerwahrstr. 2, 91058 Erlangen, Germany;
| | - Oleksandra Raievska
- Semiconductor Physics, Chemnitz University of Technology, D-09107 Chemnitz, Germany; (O.R.); (O.S.); (D.R.T.Z.)
- Center for Materials, Architectures, and Integration of Nanomembranes (MAIN), Chemnitz University of Technology, 09107 Chemnitz, Germany
- L.V. Pysarzhevsky Institute of Physical Chemistry, National Academy of Sciences of Ukraine, 03028 Kyiv, Ukraine
| | - Oksana Isaieva
- V. Lashkaryov Institute of Semiconductors Physics, National Academy of Sciences of Ukraine, 01601 Kyiv, Ukraine; (O.I.); (O.K.); (V.Y.); (M.V.)
| | - Olga Kapush
- V. Lashkaryov Institute of Semiconductors Physics, National Academy of Sciences of Ukraine, 01601 Kyiv, Ukraine; (O.I.); (O.K.); (V.Y.); (M.V.)
| | - Oleksandr Selyshchev
- Semiconductor Physics, Chemnitz University of Technology, D-09107 Chemnitz, Germany; (O.R.); (O.S.); (D.R.T.Z.)
| | - Volodymyr Yukhymchuk
- V. Lashkaryov Institute of Semiconductors Physics, National Academy of Sciences of Ukraine, 01601 Kyiv, Ukraine; (O.I.); (O.K.); (V.Y.); (M.V.)
| | - Mykhailo Valakh
- V. Lashkaryov Institute of Semiconductors Physics, National Academy of Sciences of Ukraine, 01601 Kyiv, Ukraine; (O.I.); (O.K.); (V.Y.); (M.V.)
| | - Dietrich R. T. Zahn
- Semiconductor Physics, Chemnitz University of Technology, D-09107 Chemnitz, Germany; (O.R.); (O.S.); (D.R.T.Z.)
- Center for Materials, Architectures, and Integration of Nanomembranes (MAIN), Chemnitz University of Technology, 09107 Chemnitz, Germany
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27
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Utterback JK, Cline RP, Shulenberger KE, Eaves JD, Dukovic G. The Motion of Trapped Holes on Nanocrystal Surfaces. J Phys Chem Lett 2020; 11:9876-9885. [PMID: 33170725 DOI: 10.1021/acs.jpclett.0c02618] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
This Perspective discusses the phenomenon of trapped-hole diffusion in colloidal semiconductor nanocrystals. Surface charge-carrier traps are ubiquitous in nanocrystals and often dictate the fate of photoexcited carriers. New measurements and calculations are unveiling the nature of the nanocrystal surface, but many challenges to understanding the dynamics of trapped carriers remain. In contrast to the view that trapped holes are stationary, we have put forward a series of reports demonstrating that trapped holes on the surfaces of CdS and CdSe nanocrystals are mobile and move between traps in a sequence of hops. We summarize how these findings advance the understanding of carrier dynamics in colloidal nanocrystals and how they may impact a broad set of excited-state behaviors in these materials.
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Affiliation(s)
- James K Utterback
- Department of Chemistry, University of Colorado Boulder, Boulder, Colorado 80309, United States
| | - R Peyton Cline
- Department of Chemistry, University of Colorado Boulder, Boulder, Colorado 80309, United States
| | | | - Joel D Eaves
- Department of Chemistry, University of Colorado Boulder, Boulder, Colorado 80309, United States
| | - Gordana Dukovic
- Department of Chemistry, University of Colorado Boulder, Boulder, Colorado 80309, United States
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28
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Golovan LA, Elopov AV, Zaitsev VB, Ezhov AA, Zhigunov DM, Karpov ON, Shandryuk GA, Merekalov AS, Talroze RV. Photoluminescence of CdSe and CdSe/ZnS Quantum Dots in Amorphous and Liquid-Crystalline Polymer Matrices. POLYMER SCIENCE SERIES A 2020. [DOI: 10.1134/s0965545x20060048] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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29
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Ronchi A, Capitani C, Pinchetti V, Gariano G, Zaffalon ML, Meinardi F, Brovelli S, Monguzzi A. High Photon Upconversion Efficiency with Hybrid Triplet Sensitizers by Ultrafast Hole-Routing in Electronic-Doped Nanocrystals. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2020; 32:e2002953. [PMID: 32761660 DOI: 10.1002/adma.202002953] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/01/2020] [Revised: 06/18/2020] [Indexed: 06/11/2023]
Abstract
Low-power photon upconversion (UC) based on sensitized triplet-triplet annihilation (sTTA) is considered as the most promising upward wavelength-shifting technique to enhance the light-harvesting capability of solar devices. Colloidal nanocrystals (NCs) with conjugated organic ligands have been recently proposed to extend the limited light-harvesting capability of molecular absorbers. Key to their functioning is efficient energy transfer (ET) from the NC to the triplet state of the ligands that sensitize free annihilator moieties responsible for the upconverted luminescence. The ET efficiency is typically limited by parasitic processes, above all nonradiative hole-transfer to the ligand highest occupied molecular orbital (HOMO). Here, a new exciton-manipulation approach is demonstrated that enables loss-free ET by electronically doping CdSe NCs with gold impurities that introduce a hole-accepting intragap state above the HOMO energy of 9-anthracene acid ligands. Upon photoexcitation, the NC photoholes are rapidly routed to the Au-level, producing a long-lived bound exciton in perfect resonance with the ligand triplet. This hinders hole-transfer leading to ≈100% efficient ET that translates into an upconversion quantum yield as high as ≈12% (≈24% in the normalized definition), which is the highest performance for NC-based upconverters based on sTTA to date and approaches the record efficiency of optimized organic systems.
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Affiliation(s)
- Alessandra Ronchi
- Dipartimento di Scienza dei Materiali, Università degli Studi Milano Bicocca, via R. Cozzi 55, Milan, 20125, Italy
| | - Chiara Capitani
- Dipartimento di Scienza dei Materiali, Università degli Studi Milano Bicocca, via R. Cozzi 55, Milan, 20125, Italy
- Glass to Power SpA, Via Fortunato Zeni 8, Rovereto, I-38068, Italy
| | - Valerio Pinchetti
- Dipartimento di Scienza dei Materiali, Università degli Studi Milano Bicocca, via R. Cozzi 55, Milan, 20125, Italy
| | | | - Matteo L Zaffalon
- Dipartimento di Scienza dei Materiali, Università degli Studi Milano Bicocca, via R. Cozzi 55, Milan, 20125, Italy
| | - Francesco Meinardi
- Dipartimento di Scienza dei Materiali, Università degli Studi Milano Bicocca, via R. Cozzi 55, Milan, 20125, Italy
- Glass to Power SpA, Via Fortunato Zeni 8, Rovereto, I-38068, Italy
| | - Sergio Brovelli
- Dipartimento di Scienza dei Materiali, Università degli Studi Milano Bicocca, via R. Cozzi 55, Milan, 20125, Italy
- Glass to Power SpA, Via Fortunato Zeni 8, Rovereto, I-38068, Italy
| | - Angelo Monguzzi
- Dipartimento di Scienza dei Materiali, Università degli Studi Milano Bicocca, via R. Cozzi 55, Milan, 20125, Italy
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30
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Xu Z, Huang Z, Li C, Huang T, Evangelista FA, Tang ML, Lian T. Tuning the Quantum Dot (QD)/Mediator Interface for Optimal Efficiency of QD-Sensitized Near-Infrared-to-Visible Photon Upconversion Systems. ACS APPLIED MATERIALS & INTERFACES 2020; 12:36558-36567. [PMID: 32677433 DOI: 10.1021/acsami.0c10269] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Lead sulfide (PbS) quantum dots (QDs) have shown promising performance as a sensitizer in infrared-to-visible photon upconversion systems. To investigate the key design rules, we compare three PbS-sensitized upconversion systems using three mediator molecules with the same tetracene triplet acceptor at different distances from the QD. Using transient absorption spectroscopy, we directly measure the triplet energy-transfer rates and efficiencies from the QD to the mediator and from the mediator to the emitter. With increasing distance between the mediator and PbS QD, the efficiency of the first triplet energy transfer from the QD to the mediator decreases because of a decrease in the rate of this triplet energy-transfer step, while the efficiency of the second triplet energy transfer from the mediator to the emitter increases because of a reduction in the QD-induced mediator triplet state decay. The latter effect is a result of the slow rate constant of the second triplet energy-transfer process, which is 3 orders of magnitude slower than the diffusion-limited value. The combined results lead to a net decrease of the steady-state upconversion quantum yield with distance, which could be predicted by our kinetic model. Our result shows that the QD/mediator interface affects both the first and second triplet energy transfer processes in the photon upconversion system, and the QD/mediator distance has an opposite effect on the efficiencies of the first and second triplet energy transfer. These findings provide important insight for the further rational improvement of the overall efficiency of QD-based upconversion systems.
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Affiliation(s)
- Zihao Xu
- Department of Chemistry, Emory University, Atlanta, Georgia 30322, United States
| | - Zhiyuan Huang
- Department of Chemistry, University of California, Riverside, Riverside, California 92521, United States
| | - Chenyang Li
- Department of Chemistry, Emory University, Atlanta, Georgia 30322, United States
| | - Tingting Huang
- Department of Chemistry, University of California, Riverside, Riverside, California 92521, United States
| | | | - Ming L Tang
- Department of Chemistry, University of California, Riverside, Riverside, California 92521, United States
| | - Tianquan Lian
- Department of Chemistry, Emory University, Atlanta, Georgia 30322, United States
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31
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Singh A, Yumnam S, Kunwar A, Tripathi VS, Neogy S, Rath MC. One‐Pot, Rapid and Facile Synthesis of Thioglycolic Acid capped CdSe quantum dots: Tuning of Properties, Mechanistic Investigations by Cyclic Voltammetry and Cytotoxicity Studies. ChemistrySelect 2020. [DOI: 10.1002/slct.202000974] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Avinash Singh
- Department of Science & HumanitiesMLR Institute of Technology Dundigal Hyderabad India 500043
| | - Sujata Yumnam
- Department of Science & HumanitiesMLR Institute of Technology Dundigal Hyderabad India 500043
| | - Amit Kunwar
- Radiation and Photochemistry DivisionBhabha Atomic Research Centre Mumbai India 400085
| | - V. S. Tripathi
- Radiation and Photochemistry DivisionBhabha Atomic Research Centre Mumbai India 400085
| | - Suman Neogy
- Materials Science DivisionBhabha Atomic Research Centre Mumbai India 400085
| | - M. C. Rath
- Radiation and Photochemistry DivisionBhabha Atomic Research Centre Mumbai India 400085
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32
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Huang Z, Zeng Q, Bai Z, Qin S. Regulating the Fluorescence Emission of
CdSe
Quantum Dots Based on the Surface Ligand Exchange with
MAA. POLYM ADVAN TECHNOL 2020. [DOI: 10.1002/pat.4993] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Zhaoling Huang
- Guizhou University Guiyang Guizhou China
- Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences Shenzhen China
| | - Qi Zeng
- Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences Shenzhen China
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Ligand-Length Modification in CsPbBr 3 Perovskite Nanocrystals and Bilayers with PbS Quantum Dots for Improved Photodetection Performance. NANOMATERIALS 2020; 10:nano10071297. [PMID: 32630678 PMCID: PMC7408175 DOI: 10.3390/nano10071297] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Revised: 06/25/2020] [Accepted: 06/25/2020] [Indexed: 11/21/2022]
Abstract
Nanocrystals surface chemistry engineering offers a direct approach to tune charge carrier dynamics in nanocrystals-based photodetectors. For this purpose, we have investigated the effects of altering the surface chemistry of thin films of CsPbBr3 perovskite nanocrystals produced by the doctor blading technique, via solid state ligand-exchange using 3-mercaptopropionic acid (MPA). The electrical and electro-optical properties of photovoltaic and photoconductor devices were improved after the MPA ligand exchange, mainly because of a mobility increase up to 5 × 10−3cm2/Vs. The same technology was developed to build a tandem photovoltaic device based on a bilayer of PbS quantum dots (QDs) and CsPbBr3 perovskite nanocrystals. Here, the ligand exchange was successfully carried out in a single step after the deposition of these two layers. The photodetector device showed responsivities around 40 and 20 mA/W at visible and near infrared wavelengths, respectively. This strategy can be of interest for future visible-NIR cameras, optical sensors, or receivers in photonic devices for future Internet-of-Things technology.
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34
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Mrad R, Poggi M, Ben Chaâbane R, Negrerie M. Role of surface defects in colloidal cadmium selenide (CdSe) nanocrystals in the specificity of fluorescence quenching by metal cations. J Colloid Interface Sci 2020; 571:368-377. [DOI: 10.1016/j.jcis.2020.03.058] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2020] [Revised: 03/11/2020] [Accepted: 03/16/2020] [Indexed: 12/27/2022]
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35
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Pramanik S, Roy S, Bhandari S. Luminescence Enhancement based Sensing of L-Cysteine by Doped Quantum Dots. Chem Asian J 2020; 15:1948-1952. [PMID: 32351051 DOI: 10.1002/asia.202000466] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2020] [Revised: 04/24/2020] [Indexed: 11/11/2022]
Abstract
The interaction of a presynthesized orange emitting Mn2+ -doped ZnS quantum dots (QDs) with L-Cysteine (L-Cys) led to enhance emission intensity (at 596 nm) and quantum yield (QY). Importantly, the Mn2+ -doped ZnS QDs exhibited high sensitivity towards L-Cys, with a limit of detection of 0.4±0.02 μM (in the linear range of 3.3-13.3 μM) and high selectivity in presence of interfering amino acids and metal ions. The association constant of L-Cys was determined to be 0.36×105 M-1 . The amplified passivation of the surface of Mn2+ -doped ZnS QDs following the incorporation and binding of L-Cys is accounted for the enhancement in their luminescence features. Moreover, the luminescence enhancement-based detection will bring newer dimension towards sensing application.
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Affiliation(s)
- Sabyasachi Pramanik
- Department of Chemistry, National Institute of Technology Sikkim, Sikkim, 737139, India
| | - Shilaj Roy
- Centre for Nanotechnology, Indian Institute of Technology Guwahati, Assam, 781039, India
| | - Satyapriya Bhandari
- Physics Discipline, Indian Institute of Technology Gandhinagar, Gujrat, 382355, India
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36
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Yamauchi M, Masuo S. Self-Assembly of Semiconductor Quantum Dots using Organic Templates. Chemistry 2020; 26:7176-7184. [PMID: 32101343 DOI: 10.1002/chem.201905807] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2019] [Revised: 02/18/2020] [Indexed: 12/12/2022]
Abstract
Colloidal semiconductor nanocrystals, known as quantum dots (QDs), are regarded as brightly photoluminescent nanomaterials possessing outstanding photophysical properties, such as high photodurability and tunable absorption and emission wavelengths. Therefore, QDs have great potential for a wide range of applications, such as in photoluminescent materials, biosensors and photovoltaic devices. Since the development of synthetic methods for accessing high-quality QDs with uniform morphology and size, various types of QDs have been designed and synthesized, and their photophysical properties dispersed in solutions and at the single QD level have been reported in detail. In contrast to dispersed QDs, the photophysical properties of assembled QDs have not been revealed, although the structures of the self-assemblies are closely related to the device performance of the solid-state QDs. Therefore, creating and controlling the self-assembly of QDs into well-defined nanostructures is crucial but remains challenging. In this Minireview, we discuss the notable examples of assembled QDs such as dimers, trimers and extended QD assemblies achieved using organic templates. This Minireview should facilitate future advancements in materials science related to the assembled QDs.
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Affiliation(s)
- Mitsuaki Yamauchi
- Department of Applied Chemistry for Environment, Kwansei Gakuin University, 2-1 Gakuen, Sanda, Hyogo, 669-1337, Japan
| | - Sadahiro Masuo
- Department of Applied Chemistry for Environment, Kwansei Gakuin University, 2-1 Gakuen, Sanda, Hyogo, 669-1337, Japan
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Atomic Sulfur Passivation Improves the Photoelectrochemical Performance of ZnSe Nanorods. NANOMATERIALS 2020; 10:nano10061081. [PMID: 32486475 PMCID: PMC7353383 DOI: 10.3390/nano10061081] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/23/2020] [Revised: 05/20/2020] [Accepted: 05/21/2020] [Indexed: 01/09/2023]
Abstract
We introduced atomic sulfur passivation to tune the surface sites of heavy metal-free ZnSe nanorods, with a Zn2+-rich termination surface, which are initially capped with organic ligands and under-coordinated with Se. The S2− ions from a sodium sulfide solution were used to partially substitute a 3-mercaptopropionic acid ligand, and to combine with under-coordinated Zn termination atoms to form a ZnS monolayer on the ZnSe surface. This treatment removed the surface traps from the ZnSe nanorods, and passivated defects formed during the previous ligand exchange process, without sacrificing the efficient hole transfer. As a result, without using any co-catalysts, the atomic sulfur passivation increased the photocurrent density of TiO2/ZnSe photoanodes from 273 to 325 μA/cm2. Notably, without using any sacrificial agents, the photocurrent density for sulfur-passivated TiO2/ZnSe nanorod-based photoanodes remained at almost 100% of its initial value after 300 s of continuous operation, while for the post-deposited ZnS passivation layer, or those based on ZnSe/ZnS core–shell nanorods, it declined by 28% and 25%, respectively. This work highlights the advantages of the proper passivation of II-VI semiconductor nanocrystals as an efficient approach to tackle the efficient charge transfer and stability of photoelectrochemical cells based thereon.
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Li G, Fei X, Liu H, Gao J, Nie J, Wang Y, Tian Z, He C, Wang JL, Ji C, Oron D, Yang G. Fluorescence and Optical Activity of Chiral CdTe Quantum Dots in Their Interaction with Amino Acids. ACS NANO 2020; 14:4196-4205. [PMID: 32298573 PMCID: PMC7467813 DOI: 10.1021/acsnano.9b09101] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2019] [Accepted: 04/16/2020] [Indexed: 05/21/2023]
Abstract
Ligand-induced chirality in semiconducting nanocrystals has been the subject of extensive study in the past few years and shows potential applications in optics and biology. Yet, the origin of the chiroptical effect in semiconductor nanoparticles is still not fully understood. Here, we examine the effect of the interaction with amino acids on both the fluorescence and the optical activity of chiral semiconductor quantum dots (QDs). A significant fluorescence enhancement is observed for l/d-Cys-CdTe QDs upon interaction with all the tested amino acids, indicating suppression of nonradiative pathways as well as the passivation of surface trap sites brought via the interaction of the amino group with the CdTe QDs' surface. Heterochiral amino acids are shown to weaken the circular dichroism (CD) signal, which may be attributed to a different binding configuration of cysteine molecules on the QDs' surface. Furthermore, a red shift of both CD and fluorescence signals in l/d-Cys-CdTe QDs is only observed upon adding cysteine, while other tested amino acids do not exhibit such an effect. We speculate that the thiol group induces orbital hybridization of the highest occupied molecular orbital (HOMOs) of cysteine and the valence band of CdTe QDs, leading to the decrease of the energy band gap and a concomitant red shift of CD and fluorescence spectra. This is further verified by density functional theory calculations. Both the experimental and theoretical findings indicate that the addition of ligands that do not "directly" interact with the valence band (VB) of the QD (noncysteine moieties) changes the QD photophysical properties, as it probably modifies the way cysteine is bound to the surface. Hence, we conclude that it is not only the chemistry of the amino acid ligand that affects both CD and PL but also the exact geometry of binding that modifies these properties. Understanding the relationship between the QD's surface and chiral amino acid thus provides an additional perspective on the fundamental origin of induced chiroptical effects in semiconductor nanoparticles, potentially enabling us to optimize the design of chiral semiconductor QDs for chiroptic applications.
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Affiliation(s)
- Guangmin Li
- College
of Science, Tianjin Chengjian University, Tianjin 300384, China
- E-mail: ;
| | - Xuening Fei
- College
of Science, Tianjin Chengjian University, Tianjin 300384, China
- E-mail:
| | - Hongfei Liu
- College
of Science, Tianjin Chengjian University, Tianjin 300384, China
| | - Jing Gao
- College
of Science, Tianjin Chengjian University, Tianjin 300384, China
| | - Jiayang Nie
- College
of Science, Tianjin Chengjian University, Tianjin 300384, China
| | - Yuanbo Wang
- College
of Science, Tianjin Chengjian University, Tianjin 300384, China
| | - Zhaodong Tian
- College
of Science, Tianjin Chengjian University, Tianjin 300384, China
| | - Caicai He
- College
of Science, Tianjin Chengjian University, Tianjin 300384, China
| | - Jiang-Long Wang
- Hebei
Key Lab of Optic-Electronic Information and Materials, College of
Physics Science and Technology, Hebei University, Baoding 071002, China
| | - Chao Ji
- Key
Laboratory of Catalysis, Center Tech Tianjin
Chemical Research and Design Institute Co., Ltd., Tianjin 300131, China
| | - Dan Oron
- Department
of Physics of Complex Systems, Weizmann
Institute of Science, Rehovot 76100, Israel
| | - Gaoling Yang
- Department
of Physics of Complex Systems, Weizmann
Institute of Science, Rehovot 76100, Israel
- E-mail:
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39
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Mrad M, Ben Chaabane T, Rinnert H, Lavinia B, Jasniewski J, Medjahdi G, Schneider R. Aqueous Synthesis for Highly Emissive 3-Mercaptopropionic Acid-Capped AIZS Quantum Dots. Inorg Chem 2020; 59:6220-6231. [DOI: 10.1021/acs.inorgchem.0c00347] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Maroua Mrad
- Université de Carthage, Faculté des Sciences de Bizerte, LR 18 ES11 Laboratoire des composés hétéro-organiques et des matériaux nanostructurés, 7021 Jarzouna, Bizerte, Tunisia
- Université de Lorraine, CNRS, LRGP, F-54000 Nancy, France
| | - Tahar Ben Chaabane
- Université de Carthage, Faculté des Sciences de Bizerte, LR 18 ES11 Laboratoire des composés hétéro-organiques et des matériaux nanostructurés, 7021 Jarzouna, Bizerte, Tunisia
| | - Hervé Rinnert
- Université de Lorraine, CNRS, IJL, F-54000 Nancy, France
| | - Balan Lavinia
- CEMHTI-UPR 3079 CNRS, Site Haute Température, 1D avenue de la Recherche Scientifique, 45071 Orléans, France
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40
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Purcell-Milton F, Curutchet A, Gun’ko Y. Electrophoretic Deposition of Quantum Dots and Characterisation of Composites. MATERIALS 2019; 12:ma12244089. [PMID: 31817844 PMCID: PMC6947596 DOI: 10.3390/ma12244089] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/25/2019] [Revised: 11/28/2019] [Accepted: 11/29/2019] [Indexed: 11/16/2022]
Abstract
Electrophoretic deposition (EPD) is an emerging technique in nanomaterial-based device fabrication. Here, we report an in-depth study of this approach as a means to deposit colloidal quantum dots (CQDs), in a range of solvents. For the first time, we report the significant improvement of EPD performance via the use of dichloromethane (DCM) for deposition of CQDs, producing a corresponding CQD-TiO2 composite with a near 10-fold increase in quantum dot loading relative to more commonly used solvents such as chloroform or toluene. We propose this effect is due to the higher dielectric constant of the solvent relative to more commonly used and therefore the stronger effect of EPD in this medium, though there remains the possibility that changes in zeta potential may also play an important role. In addition, this solvent choice enables the true universality of QD EPD to be demonstrated, via the sensitization of porous TiO2 electrodes with a range of ligand capped CdSe QDs and a range of group II-VI CQDs including CdS, CdSe/CdS, CdS/CdSe and CdTe/CdSe, and group IV-VI PbS QDs.
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Affiliation(s)
- Finn Purcell-Milton
- School of Chemistry, Trinity College Dublin, University of Dublin, Dublin 2, Ireland;
- BEACON, Bioeconomy Research Centre, University College Dublin, Dublin 4, Ireland
- Correspondence: (F.P.M.); (Y.G.)
| | - Antton Curutchet
- School of Chemistry, Trinity College Dublin, University of Dublin, Dublin 2, Ireland;
| | - Yurii Gun’ko
- School of Chemistry, Trinity College Dublin, University of Dublin, Dublin 2, Ireland;
- BEACON, Bioeconomy Research Centre, University College Dublin, Dublin 4, Ireland
- Correspondence: (F.P.M.); (Y.G.)
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41
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Califano M, Skibinsky-Gitlin ES, Gómez-Campos FM, Rodríguez-Bolívar S. New strategies for colloidal-quantum-dot-based intermediate-band solar cells. J Chem Phys 2019; 151:154101. [DOI: 10.1063/1.5121360] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Affiliation(s)
- Marco Califano
- Pollard Institute, School of Electronic and Electrical Engineering, and Bragg Centre for Materials Research, University of Leeds, Leeds LS2 9JT, United Kingdom
| | - Erik S. Skibinsky-Gitlin
- Departamento de Electrónica y Tecnología de Computadores, Facultad de Ciencias, Universidad de Granada, 18071 Granada, Spain
| | - Francisco M. Gómez-Campos
- Departamento de Electrónica y Tecnología de Computadores, Facultad de Ciencias, Universidad de Granada, 18071 Granada, Spain
- CITIC-UGR, C/ Periodista Rafael Gómez Montero, n 2, Granada, Spain
| | - Salvador Rodríguez-Bolívar
- Departamento de Electrónica y Tecnología de Computadores, Facultad de Ciencias, Universidad de Granada, 18071 Granada, Spain
- CITIC-UGR, C/ Periodista Rafael Gómez Montero, n 2, Granada, Spain
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Wu X, Xie S, Liu C, Zhou C, Lin J, Kang J, Zhang Q, Wang Z, Wang Y. Ligand-Controlled Photocatalysis of CdS Quantum Dots for Lignin Valorization under Visible Light. ACS Catal 2019. [DOI: 10.1021/acscatal.9b02171] [Citation(s) in RCA: 79] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Xuejiao Wu
- State Key Laboratory of Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, National Engineering Laboratory for Green Chemical Productions of Alcohols, Ethers and Esters, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Shunji Xie
- State Key Laboratory of Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, National Engineering Laboratory for Green Chemical Productions of Alcohols, Ethers and Esters, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Chenxi Liu
- State Key Laboratory of Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, National Engineering Laboratory for Green Chemical Productions of Alcohols, Ethers and Esters, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Cheng Zhou
- State Key Laboratory of Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, National Engineering Laboratory for Green Chemical Productions of Alcohols, Ethers and Esters, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Jinchi Lin
- State Key Laboratory of Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, National Engineering Laboratory for Green Chemical Productions of Alcohols, Ethers and Esters, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Jincan Kang
- State Key Laboratory of Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, National Engineering Laboratory for Green Chemical Productions of Alcohols, Ethers and Esters, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Qinghong Zhang
- State Key Laboratory of Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, National Engineering Laboratory for Green Chemical Productions of Alcohols, Ethers and Esters, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Zhaohui Wang
- State Key Laboratory of Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, National Engineering Laboratory for Green Chemical Productions of Alcohols, Ethers and Esters, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Ye Wang
- State Key Laboratory of Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, National Engineering Laboratory for Green Chemical Productions of Alcohols, Ethers and Esters, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
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43
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Deng Y, Li D, Ning X, Zhang D, Zhang S, Zhang Z, Shan D, Wang Z, Liu D, Mao X, Lu X. Self-Assembly of Biocompatible FeSe Hollow Nanostructures and 2D CuFeSe Nanosheets with One- and Two-Photon Luminescence Properties. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2019; 15:e1900627. [PMID: 31192514 DOI: 10.1002/smll.201900627] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2019] [Revised: 05/31/2019] [Indexed: 06/09/2023]
Abstract
Transition metal chalcogenides are investigated for catalyst, intermediary agency, and particular optical properties because of their distinguished electron-vacancy-transfer (EVT) process toward different applications. In this work, one convenient approach for making pure-phased FeSe nanocrystals (NCs) and doped CuFeSe nanosheets (NSs) through a wet chemistry method in mixed solvents is illustrated. The surface modification of each product is realized by using a peptide molecule glutathione (GSH), in which the thiol group (-SH) is ascribed to be the in situ reducer and bonding agency between the crystalline surface and surfactant in whole constructing processes. Due to the functional groups in biological GSH, highly aggregated NCs are rebuilt in the form of an FeSe hollow structure through amino and carboxyl cross-linking functions through a spontaneous assembly procedure. Owing to the coupling procedure of Cu and Fe in the growth process, it generates enhanced EVT. Additionally, it shows the emission spectra of λEM-PL = 436 nm (FeSe) and 452 nm (CuFeSe) while λEX-PL = 356 nm, it also conveys two-photon phenomenon while λEX-PL = 720 nm. Moreover, it also shows strong off-resonant luminescence due to two-photon absorption, which should be valuable for biological applications.
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Affiliation(s)
- Yang Deng
- Tianjin Key Laboratory of Molecular Optoelectronic Science, Department of Chemistry School of Science, Tianjin University, Tianjin, 300072, P. R. China
| | - Dianqi Li
- College of Chemistry, Research Center for Analytical Sciences, State Key Laboratory of Medicinal Chemical Biology, and Tianjin Key Laboratory of Molecular Recognition and Biosensing, Nankai University, Tianjin, 300071, P. R. China
| | - Xingming Ning
- Tianjin Key Laboratory of Molecular Optoelectronic Science, Department of Chemistry School of Science, Tianjin University, Tianjin, 300072, P. R. China
| | - Dongxu Zhang
- Tianjin Key Laboratory of Molecular Optoelectronic Science, Department of Chemistry School of Science, Tianjin University, Tianjin, 300072, P. R. China
| | - Shouting Zhang
- Tianjin Key Laboratory of Molecular Optoelectronic Science, Department of Chemistry School of Science, Tianjin University, Tianjin, 300072, P. R. China
| | - Zhen Zhang
- Tianjin Key Laboratory of Molecular Optoelectronic Science, Department of Chemistry School of Science, Tianjin University, Tianjin, 300072, P. R. China
| | - Duoliang Shan
- Key Laboratory of Bioelectrochemistry & Environmental Analysis of Gansu Province, College of Chemistry & Chemical Engineering, Northwest Normal University, Lanzhou, 730070, P. R. China
| | - Zhenyu Wang
- College of Biomedical Engineering, Chongqing Medical University, Chongqing, 400016, China
| | - Dingbin Liu
- College of Chemistry, Research Center for Analytical Sciences, State Key Laboratory of Medicinal Chemical Biology, and Tianjin Key Laboratory of Molecular Recognition and Biosensing, Nankai University, Tianjin, 300071, P. R. China
| | - Xiang Mao
- College of Biomedical Engineering, Chongqing Medical University, Chongqing, 400016, China
| | - Xiaoquan Lu
- Tianjin Key Laboratory of Molecular Optoelectronic Science, Department of Chemistry School of Science, Tianjin University, Tianjin, 300072, P. R. China
- Key Laboratory of Bioelectrochemistry & Environmental Analysis of Gansu Province, College of Chemistry & Chemical Engineering, Northwest Normal University, Lanzhou, 730070, P. R. China
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44
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Utterback JK, Ruzicka JL, Hamby H, Eaves JD, Dukovic G. Temperature-Dependent Transient Absorption Spectroscopy Elucidates Trapped-Hole Dynamics in CdS and CdSe Nanorods. J Phys Chem Lett 2019; 10:2782-2787. [PMID: 31067408 DOI: 10.1021/acs.jpclett.9b00764] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Charge-carrier traps play a central role in the excited-state dynamics of semiconductor nanocrystals, but their influence is often difficult to measure directly. In CdS and CdSe nanorods of nonuniform width, spatially separated electrons and trapped holes display relaxation dynamics that follow a power-law function in time that is consistent with a recombination process limited by trapped-hole diffusion. However, power-law relaxation can originate from mechanisms other than diffusion. Here we report transient absorption spectroscopy measurements on CdS and CdSe nanorods recorded at temperatures ranging from 160 to 294 K. We find that the exponent of the power law is temperature-independent, which rules out several models based on stochastic activated processes and provides insights into the mechanism of diffusion-limited recombination in these structures. The data point to weak electronic coupling between trap states and suggest that surface-localized trapped holes couple strongly to phonons, leading to slow diffusion. Trap-to-trap hole hopping behaves classically near room temperature, while quantum aspects of phonon-assisted tunneling become observable at low temperatures.
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Affiliation(s)
- James K Utterback
- Department of Chemistry , University of Colorado Boulder , Boulder , Colorado 80309 , United States
| | - Jesse L Ruzicka
- Department of Chemistry , University of Colorado Boulder , Boulder , Colorado 80309 , United States
| | - Hayden Hamby
- Department of Chemistry , University of Colorado Boulder , Boulder , Colorado 80309 , United States
| | - Joel D Eaves
- Department of Chemistry , University of Colorado Boulder , Boulder , Colorado 80309 , United States
| | - Gordana Dukovic
- Department of Chemistry , University of Colorado Boulder , Boulder , Colorado 80309 , United States
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45
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Probing ligand removal and ordering at quantum dot surfaces using vibrational sum frequency generation spectroscopy. J Colloid Interface Sci 2019; 537:389-395. [DOI: 10.1016/j.jcis.2018.11.011] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2018] [Revised: 10/09/2018] [Accepted: 11/06/2018] [Indexed: 01/19/2023]
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46
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Ronchi A, Brazzo P, Sassi M, Beverina L, Pedrini J, Meinardi F, Monguzzi A. Triplet–triplet annihilation based photon up-conversion in hybrid molecule–semiconductor nanocrystal systems. Phys Chem Chem Phys 2019; 21:12353-12359. [DOI: 10.1039/c9cp01692a] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Photon up-conversion based on triplet–triplet annihilation (TTA) in a hybrid system exploits the annihilation of optically dark triplets of an organic emitter, sensitized by a semiconductor nanocrystal, to produce high-energy singlets that generate high energy emission.
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Affiliation(s)
- Alessandra Ronchi
- Dipartimento di Scienza dei Materiali
- Università degli Studi Milano Bicocca
- 20125 Milan
- Italy
| | - Paolo Brazzo
- Dipartimento di Scienza dei Materiali
- Università degli Studi Milano Bicocca
- 20125 Milan
- Italy
| | - Mauro Sassi
- Dipartimento di Scienza dei Materiali
- Università degli Studi Milano Bicocca
- 20125 Milan
- Italy
| | - Luca Beverina
- Dipartimento di Scienza dei Materiali
- Università degli Studi Milano Bicocca
- 20125 Milan
- Italy
| | - Jacopo Pedrini
- Dipartimento di Scienza dei Materiali
- Università degli Studi Milano Bicocca
- 20125 Milan
- Italy
| | - Francesco Meinardi
- Dipartimento di Scienza dei Materiali
- Università degli Studi Milano Bicocca
- 20125 Milan
- Italy
| | - Angelo Monguzzi
- Dipartimento di Scienza dei Materiali
- Università degli Studi Milano Bicocca
- 20125 Milan
- Italy
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47
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Shan B, Li TT, Brennaman MK, Nayak A, Wu L, Meyer TJ. Charge Transfer from Upconverting Nanocrystals to Semiconducting Electrodes: Optimizing Thermodynamic Outputs by Electronic Energy Transfer. J Am Chem Soc 2018; 141:463-471. [DOI: 10.1021/jacs.8b11110] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Bing Shan
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Ting-Ting Li
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
- Research Center of Applied Solid State Chemistry, Ningbo University, Ningbo, Zhejiang 315211, China
| | - M. Kyle Brennaman
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Animesh Nayak
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Lei Wu
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Thomas J. Meyer
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
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48
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Luo H, Kebede BA, McLaurin EJ, Chikan V. Rapid Induction and Microwave Heat-Up Syntheses of CdSe Quantum Dots. ACS OMEGA 2018; 3:5399-5405. [PMID: 31458747 PMCID: PMC6641973 DOI: 10.1021/acsomega.8b00096] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2018] [Accepted: 04/23/2018] [Indexed: 05/23/2023]
Abstract
The production of nanoparticles on an industrial scale requires an approach other than the widely used hot-injection method. In this work, two heat-up methods are applied to nanoparticle synthesis. The induction heating method produces CdSe quantum dots with ultrasmall properties in seconds. Initial flow-through experiments demonstrate that induction heating continuously produces quantum dots. These results are compared with those from microwave synthesis, which produces quantum dots on a longer timescale but provides fast, continuous heating. Both methods can produce quantum dots within seconds because of rapid heating. In addition, different precursors, single source and separate source, give different results, ultimately providing a handle to control quantum dot properties.
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49
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Akkerman Q, Abdelhady AL, Manna L. Zero-Dimensional Cesium Lead Halides: History, Properties, and Challenges. J Phys Chem Lett 2018; 9:2326-2337. [PMID: 29652149 PMCID: PMC5937914 DOI: 10.1021/acs.jpclett.8b00572] [Citation(s) in RCA: 102] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2018] [Accepted: 04/13/2018] [Indexed: 05/20/2023]
Abstract
Over the past decade, lead halide perovskites (LHPs) have emerged as new promising materials in the fields of photovoltaics and light emission due to their facile syntheses and exciting optical properties. The enthusiasm generated by LHPs has inspired research in perovskite-related materials, including the so-called "zero-dimensional cesium lead halides", which will be the focus of this Perspective. The structure of these materials is formed of disconnected lead halide octahedra that are stabilized by cesium ions. Their optical properties are dominated by optical transitions that are localized within the individual octahedra, hence the title "'zero-dimensional perovskites". Controversial results on their physical properties have recently been reported, and the true nature of their photoluminescence is still unclear. In this Perspective, we will take a close look at these materials, both as nanocrystals and as bulk crystals/thin films, discuss the contrasting opinions on their properties, propose potential applications, and provide an outlook on future experiments.
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Affiliation(s)
- Quinten
A. Akkerman
- Nanochemistry
Department, Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genova, Italy
- Dipartimento
di Chimica e Chimica Industriale, Università
degli Studi di Genova, Via Dodecaneso 31, 16146 Genova, Italy
| | - Ahmed L. Abdelhady
- Nanochemistry
Department, Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genova, Italy
- E-mail: (A.L.A.)
| | - Liberato Manna
- Nanochemistry
Department, Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genova, Italy
- E-mail: (L.M.)
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50
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Cui Y, Cui X, Zhang L, Xie Y, Yang M. Theoretical characterization on the size-dependent electron and hole trapping activity of chloride-passivated CdSe nanoclusters. J Chem Phys 2018; 148:134308. [DOI: 10.1063/1.5023408] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Affiliation(s)
- Yingqi Cui
- Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, People’s Republic of China
| | - Xianhui Cui
- Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, People’s Republic of China
| | - Li Zhang
- Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, People’s Republic of China
| | - Yujuan Xie
- Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, People’s Republic of China
| | - Mingli Yang
- Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, People’s Republic of China
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