151
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Yu H, Wang H, Zhang J, Lu J, Yuan Z, Xu W, Hultman L, Bakulin AA, Friend RH, Wang J, Liu XK, Gao F. Efficient and Tunable Electroluminescence from In Situ Synthesized Perovskite Quantum Dots. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2019; 15:e1804947. [PMID: 30690874 DOI: 10.1002/smll.201804947] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2018] [Revised: 01/09/2019] [Indexed: 05/21/2023]
Abstract
Semiconductor quantum dots (QDs) are among the most promising next-generation optoelectronic materials. QDs are generally obtained through either epitaxial or colloidal growth and carry the promise for solution-processed high-performance optoelectronic devices such as light-emitting diodes (LEDs), solar cells, etc. Herein, a straightforward approach to synthesize perovskite QDs and demonstrate their applications in efficient LEDs is reported. The perovskite QDs with controllable crystal sizes and properties are in situ synthesized through one-step spin-coating from perovskite precursor solutions followed by thermal annealing. These perovskite QDs feature size-dependent quantum confinement effect (with readily tunable emissions) and radiative monomolecular recombination. Despite the substantial structural inhomogeneity, the in situ generated perovskite QDs films emit narrow-bandwidth emission and high color stability due to efficient energy transfer between nanostructures that sweeps away the unfavorable disorder effects. Based on these materials, efficient LEDs with external quantum efficiencies up to 11.0% are realized. This makes the technologically appealing in situ approach promising for further development of state-of-the-art LED systems and other optoelectronic devices.
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Affiliation(s)
- Hongling Yu
- Department of Physics, Chemistry and Biology (IFM), Linköping University, Linköping, 58183, Sweden
| | - Heyong Wang
- Department of Physics, Chemistry and Biology (IFM), Linköping University, Linköping, 58183, Sweden
| | - Jiangbin Zhang
- Cavendish Laboratory, University of Cambridge, J. J. Thomson Avenue, Cambridge, CB3 0HE, UK
- Department of Chemistry, Imperial College London, London, SW7 2AZ, UK
| | - Jun Lu
- Department of Physics, Chemistry and Biology (IFM), Linköping University, Linköping, 58183, Sweden
| | - Zhongcheng Yuan
- Department of Physics, Chemistry and Biology (IFM), Linköping University, Linköping, 58183, Sweden
| | - Weidong Xu
- Department of Physics, Chemistry and Biology (IFM), Linköping University, Linköping, 58183, Sweden
- Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University, 30 South Puzhu Road, Nanjing, 211816, China
| | - Lars Hultman
- Department of Physics, Chemistry and Biology (IFM), Linköping University, Linköping, 58183, Sweden
| | - Artem A Bakulin
- Department of Chemistry, Imperial College London, London, SW7 2AZ, UK
| | - Richard H Friend
- Cavendish Laboratory, University of Cambridge, J. J. Thomson Avenue, Cambridge, CB3 0HE, UK
| | - Jianpu Wang
- Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University, 30 South Puzhu Road, Nanjing, 211816, China
| | - Xiao-Ke Liu
- Department of Physics, Chemistry and Biology (IFM), Linköping University, Linköping, 58183, Sweden
- Cavendish Laboratory, University of Cambridge, J. J. Thomson Avenue, Cambridge, CB3 0HE, UK
| | - Feng Gao
- Department of Physics, Chemistry and Biology (IFM), Linköping University, Linköping, 58183, Sweden
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152
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Li W, Song W, Chen B, Matcher SJ. Superparamagnetic graphene quantum dot as a dual-modality contrast agent for confocal fluorescence microscopy and magnetomotive optical coherence tomography. JOURNAL OF BIOPHOTONICS 2019; 12:e201800219. [PMID: 30191684 DOI: 10.1002/jbio.201800219] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/2018] [Accepted: 09/04/2018] [Indexed: 05/03/2023]
Abstract
A magnetic graphene quantum dot (MGQD) nanoparticle, synthesized by hydrothermally reducing and cutting graphene oxide-iron oxide sheet, was demonstrated to possess the capabilities of simultaneous confocal fluorescence and magnetomotive optical coherence tomography (MMOCT) imaging. This MGQD shows low toxicity, significant tunable blue fluorescence and superparamagnetism, which can thus be used as a dual-modality contrast agent for confocal fluorescence microscopy (CFM) and MMOCT. The feasibility of applying MGQD as a tracer of cells is shown by imaging and visualizing MGQD labeled cells using CFM and our in-house MMOCT. Since MMOCT and CFM can offer anatomical structure and intracellular details, respectively, the MGQD for cell tracking could provide a more comprehensive diagnosis.
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Affiliation(s)
- Wei Li
- Department of Electronic and Electrical Engineering, The University of Sheffield, Sheffield, UK
| | - Wenxing Song
- Department of Chemical and Biological Engineering, The University of Sheffield, Sheffield, UK
| | - Biqiong Chen
- School of Mechanical and Aerospace Engineering, Queen's University Belfast, Belfast, UK
| | - Stephen J Matcher
- Department of Electronic and Electrical Engineering, The University of Sheffield, Sheffield, UK
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153
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154
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Altintas Y, Quliyeva U, Gungor K, Erdem O, Kelestemur Y, Mutlugun E, Kovalenko MV, Demir HV. Highly Stable, Near-Unity Efficiency Atomically Flat Semiconductor Nanocrystals of CdSe/ZnS Hetero-Nanoplatelets Enabled by ZnS-Shell Hot-Injection Growth. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2019; 15:e1804854. [PMID: 30701687 DOI: 10.1002/smll.201804854] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2018] [Revised: 12/31/2018] [Indexed: 05/24/2023]
Abstract
Colloidal semiconductor nanoplatelets (NPLs) offer important benefits in nanocrystal optoelectronics with their unique excitonic properties. For NPLs, colloidal atomic layer deposition (c-ALD) provides the ability to produce their core/shell heterostructures. However, as c-ALD takes place at room temperature, this technique allows for only limited stability and low quantum yield. Here, highly stable, near-unity efficiency CdSe/ZnS NPLs are shown using hot-injection (HI) shell growth performed at 573 K, enabling routinely reproducible quantum yields up to 98%. These CdSe/ZnS HI-shell hetero-NPLs fully recover their initial photoluminescence (PL) intensity in solution after a heating cycle from 300 to 525 K under inert gas atmosphere, and their solid films exhibit 100% recovery of their initial PL intensity after a heating cycle up to 400 K under ambient atmosphere, by far outperforming the control group of c-ALD shell-coated CdSe/ZnS NPLs, which can sustain only 20% of their PL. In optical gain measurements, these core/HI-shell NPLs exhibit ultralow gain thresholds reaching ≈7 µJ cm-2 . Despite being annealed at 500 K, these ZnS-HI-shell NPLs possess low gain thresholds as small as 25 µJ cm-2 . These findings indicate that the proposed 573 K HI-shell-grown CdSe/ZnS NPLs hold great promise for extraordinarily high performance in nanocrystal optoelectronics.
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Affiliation(s)
- Yemliha Altintas
- Department of Electrical and Electronics Engineering and Department of Physics, UNAM - Institute of Materials Science and Nanotechnology, Bilkent University, Ankara, 06800, Turkey
- Department of Materials Science and Nanotechnology and Department of Electrical-Electronics Engineering, Abdullah Gül University, Kayseri, TR-38080, Turkey
| | - Ulviyya Quliyeva
- Department of Electrical and Electronics Engineering and Department of Physics, UNAM - Institute of Materials Science and Nanotechnology, Bilkent University, Ankara, 06800, Turkey
| | - Kivanc Gungor
- Department of Electrical and Electronics Engineering and Department of Physics, UNAM - Institute of Materials Science and Nanotechnology, Bilkent University, Ankara, 06800, Turkey
| | - Onur Erdem
- Department of Electrical and Electronics Engineering and Department of Physics, UNAM - Institute of Materials Science and Nanotechnology, Bilkent University, Ankara, 06800, Turkey
| | - Yusuf Kelestemur
- Department of Electrical and Electronics Engineering and Department of Physics, UNAM - Institute of Materials Science and Nanotechnology, Bilkent University, Ankara, 06800, Turkey
- Department of Chemistry and Applied Biosciences, ETH Zürich, Zürich, CH-8093, Switzerland
- Empa-Swiss Federal Laboratories for Material Science and Technology, Dübendorf, CH-8600, Switzerland
| | - Evren Mutlugun
- Department of Materials Science and Nanotechnology and Department of Electrical-Electronics Engineering, Abdullah Gül University, Kayseri, TR-38080, Turkey
| | - Maksym V Kovalenko
- Department of Chemistry and Applied Biosciences, ETH Zürich, Zürich, CH-8093, Switzerland
- Empa-Swiss Federal Laboratories for Material Science and Technology, Dübendorf, CH-8600, Switzerland
| | - Hilmi Volkan Demir
- Department of Electrical and Electronics Engineering and Department of Physics, UNAM - Institute of Materials Science and Nanotechnology, Bilkent University, Ankara, 06800, Turkey
- Luminous! Center of Excellence for Semiconductor Lighting and Displays, School of Electrical and Electronic Engineering, School of Physical and Mathematical Sciences, School of Materials Science and Nanotechnology, Nanyang Technological University, Singapore, 639798, Singapore
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155
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Xu D, Zou W, Du Z, Wang H, Liu B, Zhang C. Novel Synthesis of CdSe Quantum Dots in a Confined Space by Using a High Internal Phase Emulsion and Their Application in Fluorescent Labeling. ChemistrySelect 2019. [DOI: 10.1002/slct.201803228] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Dawei Xu
- Key Laboratory of Carbon Fiber and Functional Polymers (Beijing University of Chemical Technology); Ministry of Education; College of Materials Science and Engineering; Beijing University of Chemical Technology; Beijing 100029 PR China
| | - Wei Zou
- Key Laboratory of Carbon Fiber and Functional Polymers (Beijing University of Chemical Technology); Ministry of Education; College of Materials Science and Engineering; Beijing University of Chemical Technology; Beijing 100029 PR China
- Changzhou Institute of Advanced Materials; Beijing University of Chemical Technology; Jiangsu 213164 PR China
| | - Zhongjie Du
- Changzhou Institute of Advanced Materials; Beijing University of Chemical Technology; Jiangsu 213164 PR China
| | - Hong Wang
- Key Laboratory of Carbon Fiber and Functional Polymers (Beijing University of Chemical Technology); Ministry of Education; College of Materials Science and Engineering; Beijing University of Chemical Technology; Beijing 100029 PR China
| | - Bin Liu
- Key Laboratory of Carbon Fiber and Functional Polymers (Beijing University of Chemical Technology); Ministry of Education; College of Materials Science and Engineering; Beijing University of Chemical Technology; Beijing 100029 PR China
| | - Chen Zhang
- Key Laboratory of Carbon Fiber and Functional Polymers (Beijing University of Chemical Technology); Ministry of Education; College of Materials Science and Engineering; Beijing University of Chemical Technology; Beijing 100029 PR China
- Changzhou Institute of Advanced Materials; Beijing University of Chemical Technology; Jiangsu 213164 PR China
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156
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Synthesis of Cu₂O/CuO Nanocrystals and Their Application to H₂S Sensing. SENSORS 2019; 19:s19010211. [PMID: 30626139 PMCID: PMC6339020 DOI: 10.3390/s19010211] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/13/2018] [Revised: 12/28/2018] [Accepted: 01/07/2019] [Indexed: 02/05/2023]
Abstract
Semiconducting metal oxide nanocrystals are an important class of materials that have versatile applications because of their useful properties and high stability. Here, we developed a simple route to synthesize nanocrystals (NCs) of copper oxides such as Cu2O and CuO using a hot-soap method, and applied them to H2S sensing. Cu2O NCs were synthesized by simply heating a copper precursor in oleylamine in the presence of diol at 160 °C under an Ar flow. X-ray diffractometry (XRD), dynamic light scattering (DLS), and transmission electron microscopy (TEM) results indicated the formation of monodispersed Cu2O NCs having approximately 5 nm in crystallite size and 12 nm in colloidal size. The conversion of the Cu2O NCs to CuO NCs was undertaken by straightforward air oxidation at room temperature, as confirmed by XRD and UV-vis analyses. A thin film Cu2O NC sensor fabricated by spin coating showed responses to H2S in dilute concentrations (1–8 ppm) at 50–150 °C, but the stability was poor because of the formation of metallic Cu2S in a H2S atmosphere. We found that Pd loading improved the stability of the sensor response. The Pd-loaded Cu2O NC sensor exhibited reproducible responses to H2S at 200 °C. Based on the gas sensing mechanism, it is suggested that Pd loading facilitates the reaction of adsorbed oxygen with H2S and suppresses the irreversible formation of Cu2S.
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157
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Plant-Mediated Green Synthesis of Nanostructures: Mechanisms, Characterization, and Applications. INTERFACE SCIENCE AND TECHNOLOGY 2019. [DOI: 10.1016/b978-0-12-813586-0.00006-7] [Citation(s) in RCA: 48] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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158
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Schnee VP, Bright CJ. Contact Printing of a Quantum Dot and Polymer Cross-Reactive Array Sensor. Methods Mol Biol 2019; 2027:61-73. [PMID: 31309472 DOI: 10.1007/978-1-4939-9616-2_5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The incorporation of organic polymeric materials into chemical sensors and electro-optic devices has the potential to greatly advance these fields. A major challenge to their incorporation is the fabrication of thin films due to their intolerance of thermal deposition methods and solvent compatibility challenges. Here, a method for contact printing of quantum dot (QD) and organic polymer (OP) composites for the production of thin-film chemical sensors is described. The method described here allows for the repeatable, low-cost, and relatively simple production of thin films of QD/OP composites for use in chemical sensor arrays by a dry transfer process of the polymer on an elastomer stamp to the sensor substrate.
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Affiliation(s)
- Vincent P Schnee
- U.S Army Combat Capabilities Development Command, C5ISR Center, Fort Belvoir, VA, USA.
| | - Collin J Bright
- U.S Army Combat Capabilities Development Command, C5ISR Center, Fort Belvoir, VA, USA
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159
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160
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Khan MD, Aamir M, Akhtar J, Malik MA, Revaprasadu N. Metal selenobenzoate complexes: Novel single source precursors for the synthesis of metal selenide semiconductor nanomaterials. ACTA ACUST UNITED AC 2019. [DOI: 10.1016/j.matpr.2019.02.190] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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161
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Zhao N, Yan L, Zhao X, Chen X, Li A, Zheng D, Zhou X, Dai X, Xu FJ. Versatile Types of Organic/Inorganic Nanohybrids: From Strategic Design to Biomedical Applications. Chem Rev 2018; 119:1666-1762. [DOI: 10.1021/acs.chemrev.8b00401] [Citation(s) in RCA: 229] [Impact Index Per Article: 38.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Nana Zhao
- State Key Laboratory of Chemical Resource Engineering, Beijing Laboratory of Biomedical Materials, Key Laboratory of Carbon Fiber and Functional Polymers (Beijing University of Chemical Technology), Ministry of Education, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Liemei Yan
- State Key Laboratory of Chemical Resource Engineering, Beijing Laboratory of Biomedical Materials, Key Laboratory of Carbon Fiber and Functional Polymers (Beijing University of Chemical Technology), Ministry of Education, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Xiaoyi Zhao
- State Key Laboratory of Chemical Resource Engineering, Beijing Laboratory of Biomedical Materials, Key Laboratory of Carbon Fiber and Functional Polymers (Beijing University of Chemical Technology), Ministry of Education, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Xinyan Chen
- State Key Laboratory of Chemical Resource Engineering, Beijing Laboratory of Biomedical Materials, Key Laboratory of Carbon Fiber and Functional Polymers (Beijing University of Chemical Technology), Ministry of Education, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Aihua Li
- College of Materials Science and Engineering, Institute for Graphene Applied Technology Innovation, Laboratory of Fiber Materials and Modern Textiles, Growing Base for State Key Laboratory, Collaborative Innovation Center for Marine Biomass Fibers Materials and Textiles of Shandong Province, Qingdao University, Qingdao 266071, China
| | - Di Zheng
- State Key Laboratory of Chemical Resource Engineering, Beijing Laboratory of Biomedical Materials, Key Laboratory of Carbon Fiber and Functional Polymers (Beijing University of Chemical Technology), Ministry of Education, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Xin Zhou
- State Key Laboratory of Chemical Resource Engineering, Beijing Laboratory of Biomedical Materials, Key Laboratory of Carbon Fiber and Functional Polymers (Beijing University of Chemical Technology), Ministry of Education, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Xiaoguang Dai
- State Key Laboratory of Chemical Resource Engineering, Beijing Laboratory of Biomedical Materials, Key Laboratory of Carbon Fiber and Functional Polymers (Beijing University of Chemical Technology), Ministry of Education, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Fu-Jian Xu
- State Key Laboratory of Chemical Resource Engineering, Beijing Laboratory of Biomedical Materials, Key Laboratory of Carbon Fiber and Functional Polymers (Beijing University of Chemical Technology), Ministry of Education, Beijing University of Chemical Technology, Beijing, 100029, China
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162
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Sun H, Wang F, Buhro WE. Tellurium Precursor for Nanocrystal Synthesis: Tris(dimethylamino)phosphine Telluride. ACS NANO 2018; 12:12393-12400. [PMID: 30452232 DOI: 10.1021/acsnano.8b06468] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Preparations of CdTe quantum platelets, magic-size (CdTe)13 nanoclusters, and CdTe quantum wires are described using (Me2N)3PTe (with (Me2N)3P) as a Te precursor. The (Me2N)3PTe/(Me2N)3P precursor mixture is shown to be more reactive than mixtures of trialkylphosphine tellurides and the corresponding trialkylphosphines, R3PTe/R3P, which are commonly employed in nanocrystal syntheses. For syntheses conducted in primary amine solvents, (Me2N)3PTe and (Me2N)3P undergo a transamination reaction, affording (Me2N) x(RHN)3- xPTe and (Me2N) x(RHN)3- xP (R = n-octyl or oleyl). The transaminated (Me2N) x(RHN)3- xPTe derivatives are shown to be the likely Te precursors under those conditions. The enhanced reactivities of the tris(amino)phosphine tellurides are ascribed to increased nucleophilicity due to the amino-N lone pairs.
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Affiliation(s)
- Haochen Sun
- Department of Chemistry and Institute of Materials Science and Engineering , Washington University , St. Louis , Missouri 63130-4899 , United States
| | - Fudong Wang
- Department of Chemistry and Institute of Materials Science and Engineering , Washington University , St. Louis , Missouri 63130-4899 , United States
| | - William E Buhro
- Department of Chemistry and Institute of Materials Science and Engineering , Washington University , St. Louis , Missouri 63130-4899 , United States
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163
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Wang L, Hui J, Tang J, Rowell N, Zhang B, Zhu T, Zhang M, Hao X, Fan H, Zeng J, Han S, Yu K. Precursor Self-Assembly Identified as a General Pathway for Colloidal Semiconductor Magic-Size Clusters. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2018; 5:1800632. [PMID: 30581693 PMCID: PMC6299716 DOI: 10.1002/advs.201800632] [Citation(s) in RCA: 49] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2018] [Revised: 07/30/2018] [Indexed: 05/29/2023]
Abstract
Little is known about the formation pathway of colloidal semiconductor magic-size clusters (MSCs). Here, the synthesis of the first single-ensemble ZnSe MSCs, which exhibit a sharp optical absorption singlet peaking at 299 nm, is reported; their formation is independent of Zn and Se precursors used. It is proposed that the formation of MSCs starts with precursor self-assembly followed by Zn and Se covalent bond formation to result in immediate precursors (IPs) which can transform into the MSCs. It is demonstrated that the IPs in cyclohexane appear transparent in optical absorption, and become visible as MSCs exhibiting one sharp optical absorption peak when a primary amine is added at room temperature. It is shown that when the preparation of the IP is controlled to be within the induction period, which occurs prior to nucleation and growth of conventional quantum dots (QDs), the resulting MSCs can be produced without the complication of the simultaneous coproduction of conventional QDs. The present study reveals the existence of precursor self-assembly which leads to the formation of colloidal semiconductor MSCs and provides insights into a multistep nucleation process in cluster science.
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Affiliation(s)
- Linxi Wang
- Institute of Atomic and Molecular PhysicsSichuan UniversityChengdu610065P. R. China
| | - Juan Hui
- Institute of Atomic and Molecular PhysicsSichuan UniversityChengdu610065P. R. China
| | - Junbin Tang
- Institute of Atomic and Molecular PhysicsSichuan UniversityChengdu610065P. R. China
| | - Nelson Rowell
- National Research Council of CanadaOttawaOntarioK1A 0R6Canada
| | - Baowei Zhang
- Institute of Atomic and Molecular PhysicsSichuan UniversityChengdu610065P. R. China
| | - Tingting Zhu
- Institute of Atomic and Molecular PhysicsSichuan UniversityChengdu610065P. R. China
| | - Meng Zhang
- Institute of Atomic and Molecular PhysicsSichuan UniversityChengdu610065P. R. China
| | - Xiaoyu Hao
- Institute of Atomic and Molecular PhysicsSichuan UniversityChengdu610065P. R. China
| | - Hongsong Fan
- Engineering Research Center in BiomaterialsSichuan UniversityChengdu610065P. R. China
| | - Jianrong Zeng
- Shanghai Synchrotron Radiation FacilityShanghai Institute of Applied PhysicsChinese Academy of SciencesShanghai201204P. R. China
| | - Shuo Han
- Institute of Atomic and Molecular PhysicsSichuan UniversityChengdu610065P. R. China
| | - Kui Yu
- Institute of Atomic and Molecular PhysicsSichuan UniversityChengdu610065P. R. China
- Engineering Research Center in BiomaterialsSichuan UniversityChengdu610065P. R. China
- School of Chemical EngineeringSichuan UniversityChengdu610065P. R. China
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164
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Wu M, Wang Y, Wang H, Wang H, Sui Y, Du F, Yang X, Zou B. Phosphine-free engineering toward the synthesis of metal telluride nanocrystals: the role of a Te precursor coordinated at room temperature. NANOSCALE 2018; 10:21928-21935. [PMID: 30431639 DOI: 10.1039/c8nr07595f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
A colloidal strategy offers opportunities for the rational design and synthesis of metal telluride nanocrystals (NCs) with the desired crystal structure, uniform geometry, and composition. However, it remains a challenge to use the paradigm to construct metal telluride NCs by a phosphine-free synthesis procedure for promising applications such as luminescence, photovoltaics and thermoelectricity. Here, we developed a new strategy for fabricating metal telluride nanocrystals, e.g. CdTe and PbTe NCs, by using a highly reactive phosphine-free Te precursor. The ability to reduce a TeO2 powder with dodecanethiol (DDT) has been achieved in the presence of oleylamine (OLA) to generate a soluble alkylammonium telluride at room temperature. We provide direct experimental evidence that the OLA-Te complexes were formed in an order of second magnitude kinetic process based on an in situ UV-vis absorption test. In the case of the CdTe NC system, the straightforward measurement of luminescence and the fabrication of LED devices are presented that can semiquantitatively assess the quality of preparation and the reactivity of this air-stable precursor. The proposed strategy highlights several unique features of this solution-based green chemistry that can be useful for synthesizing other metal telluride NCs to develop novel functional materials.
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Affiliation(s)
- Min Wu
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun, 130012, China.
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165
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Toufanian R, Piryatinski A, Mahler AH, Iyer R, Hollingsworth JA, Dennis AM. Bandgap Engineering of Indium Phosphide-Based Core/Shell Heterostructures Through Shell Composition and Thickness. Front Chem 2018; 6:567. [PMID: 30515380 PMCID: PMC6255924 DOI: 10.3389/fchem.2018.00567] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2018] [Accepted: 10/31/2018] [Indexed: 11/13/2022] Open
Abstract
The large bulk bandgap (1.35 eV) and Bohr radius (~10 nm) of InP semiconductor nanocrystals provides bandgap tunability over a wide spectral range, providing superior color tuning compared to that of CdSe quantum dots. In this paper, the dependence of the bandgap, photoluminescence emission, and exciton radiative lifetime of core/shell quantum dot heterostructures has been investigated using colloidal InP core nanocrystals with multiple diameters (1.5, 2.5, and 3.7 nm). The shell thickness and composition dependence of the bandgap for type-I and type-II heterostructures was observed by coating the InP core with ZnS, ZnSe, CdS, or CdSe through one to ten iterations of a successive ion layer adsorption and reaction (SILAR)-based shell deposition. The empirical results are compared to bandgap energy predictions made with effective mass modeling. Photoluminescence emission colors have been successfully tuned throughout the visible and into the near infrared (NIR) wavelength ranges for type-I and type-II heterostructures, respectively. Based on sizing data from transmission electron microscopy (TEM), it is observed that at the same particle diameter, average radiative lifetimes can differ as much as 20-fold across different shell compositions due to the relative positions of valence and conduction bands. In this direct comparison of InP/ZnS, InP/ZnSe, InP/CdS, and InP/CdSe core/shell heterostructures, we clearly delineate the impact of core size, shell composition, and shell thickness on the resulting optical properties. Specifically, Zn-based shells yield type-I structures that are color tuned through core size, while the Cd-based shells yield type-II particles that emit in the NIR regardless of the starting core size if several layers of CdS(e) have been successfully deposited. Particles with thicker CdS(e) shells exhibit longer photoluminescence lifetimes, while little shell-thickness dependence is observed for the Zn-based shells. Taken together, these InP-based heterostructures demonstrate the extent to which we are able to precisely tailor the material properties of core/shell particles using core/shell dimensions and composition as variables.
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Affiliation(s)
- Reyhaneh Toufanian
- Division of Materials Science and Engineering, Boston University, Boston, MA, United States
| | - Andrei Piryatinski
- Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM, United States
| | - Andrew H Mahler
- Department of Biomedical Engineering, Boston University, Boston, MA, United States
| | - Radhika Iyer
- Los Alamos National Laboratory, Materials Physics and Applications Division, Center for Integrated Nanotechnologies, Los Alamos, NM, United States
| | - Jennifer A Hollingsworth
- Los Alamos National Laboratory, Materials Physics and Applications Division, Center for Integrated Nanotechnologies, Los Alamos, NM, United States
| | - Allison M Dennis
- Division of Materials Science and Engineering, Boston University, Boston, MA, United States.,Department of Biomedical Engineering, Boston University, Boston, MA, United States
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166
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Liang X, Yuan Y, Han T, Cheng Y, Xiong C, Dong L. Encapsulation and solubilization of ultrastable quantum dots with multidentate bilayer ligands and rheological behaviour. NANOSCALE 2018; 10:20796-20803. [PMID: 30402650 DOI: 10.1039/c8nr04410d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Quantum dots with unique optical and chemical properties show great potential applications in biology and chemical and medical science. Nevertheless, their practical applications in various fields are greatly limited due to the presence of hydrophobic organic surfaces. In this paper, we report a simple and effective method based on ligand exchange and proton donor-receptor reaction to prepare ultrastable and amphiphilic quantum dots having bilayer ligands with ultidentate structure, which provide active sites for subsequent functional conjugation. Our results show that these quantum dots exhibit monodispersity, excellent stability and solvent-free fluidity. In addition, they maintain their optical properties in a chemical environment due to the large amount of amphiphilic amine salts as ligands, which also endow quantum dots with lower cytotoxicity and higher antibacterial activity. The synthesis strategy in this study provides a new insight into the design and fabrication of promising multifunctional materials for biology, medicine, and energy and display technologies.
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Affiliation(s)
- Xiao Liang
- Center for Smart Materials and Devices, State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China.
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167
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Abdellatif AA, Aldalaen SM, Faisal W, Tawfeek HM. Somatostatin receptors as a new active targeting sites for nanoparticles. Saudi Pharm J 2018; 26:1051-1059. [PMID: 30416362 PMCID: PMC6218373 DOI: 10.1016/j.jsps.2018.05.014] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2018] [Accepted: 05/22/2018] [Indexed: 12/11/2022] Open
Abstract
The delivery of nanoparticles through receptor-mediated cell interactions has nowadays a major attention in the area of drug targeting applications. This specific kind of targeting is mediated by localized receptors impeded into the target site with subsequent drugs internalization. Hence, this type of interaction would diminish side effects and enhance drug delivery efficacy to the target site. Somatostatin receptors (SSTRs) are one type of G protein-coupled receptors, which could be active targeted for various purposes. There are five SSTRs types (SSTR1-5) which are localized at various organs in the body and spread into different tissues. SSTRs could be considered as a promising target to various nanoparticles which is facilitated when nanoparticles are modified through specific ligand or coating to allow better binding. This review discusses the exploration of SSTRs for active targeting of nanoparticles with certain emphasize on their interaction at the cellular level.
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Affiliation(s)
- Ahmed A.H. Abdellatif
- Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Al-Azhar University, Assiut 71524, Egypt
- Department of Pharmaceutics, Faculty of Pharmacy, Qassim University, Buraydah, 51452 Al-Qassim, Kingdom of Saudi Arabia
| | - Sa'ed M. Aldalaen
- Department of Pharmaceutics and Pharmaceutical Technology, Faculty of Pharmacy, Mutah University, Mutah, Al-Karak 61710, Jordan
| | - Waleed Faisal
- Department of Pharmaceutics, Faculty of Pharmacy, Minia University, Minia, Egypt
- School of Pharmacy, University of College Cork, Cork, Ireland
| | - Hesham M. Tawfeek
- Department of Pharmaceutics and Pharmaceutical Technology, Faculty of Pharmacy, Mutah University, Mutah, Al-Karak 61710, Jordan
- Department of Industrial Pharmacy, Faculty of Pharmacy, Assiut University, Assiut 71526, Egypt
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168
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Salerno G, Scarano S, Mamusa M, Consumi M, Giuntini S, Macagnano A, Nativi S, Fragai M, Minunni M, Berti D, Magnani A, Nativi C, Richichi B. A small heterobifunctional ligand provides stable and water dispersible core-shell CdSe/ZnS quantum dots (QDs). NANOSCALE 2018; 10:19720-19732. [PMID: 30256371 DOI: 10.1039/c8nr05566a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
We describe a simple method to prepare water dispersible core-shell CdSe/ZnS quantum dots (QDs) 1 by capping QDs with a new thiol-containing heterobifunctional dicarboxylic ligand 4 (DHLA-EDADA). This ligand, obtained on a gram scale through a few synthetic steps, provides a compact layer on the QDs, whose hydrodynamic size in H2O is 15 nm ± 3 nm. The colloidal stability is dramatically enhanced with respect to the well-known (±) α-lipoic acid (DHLA). The ligand affinity towards QDs and the water dispersibility of nanocrystals 1 are addressed by the dithiol groups of DHLA, which chelate the zinc of the shell, and by the dicarboxylic groups of the ethylenediamine-N,N-diacetic acid (EDADA) residue, respectively. The effects of pH, buffer solutions, and biological medium on the stability of QDs 1 were assessed by monitoring the photoluminescence (PL) and hydrodynamic size over time. Highly fluorescent QD dispersions, stable over extended periods of time and over broad pH ranges and buffer types, were obtained. Furthermore, we show that the DHLA-EDADA ligand 4 also endows QDs with functional groups suitable for further conjugation and for metal ion detection. As a case study to illustrate the potential of our approach, we report the preparation and characterization of a highly luminescent orange light emitting polymer-QD 1 composite film.
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Affiliation(s)
- Gianluca Salerno
- Department of Chemistry 'Ugo Schiff', University of Florence, Via della Lastruccia 13, 50019 Sesto F.no, FI, Italy.
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169
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Alkuam E, Badradeen E, Guisbiers G. Influence of CdS Morphology on the Efficiency of Dye-Sensitized Solar Cells. ACS OMEGA 2018; 3:13433-13441. [PMID: 31458055 PMCID: PMC6645277 DOI: 10.1021/acsomega.8b01631] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/29/2018] [Accepted: 09/14/2018] [Indexed: 06/10/2023]
Abstract
Cadmium sulfide (CdS) used in dye-sensitized solar cells (DSSCs) is currently mainly synthesized by chemical bath deposition, vacuum evaporation, spray deposition, chemical vapor deposition, electrochemical deposition, sol-gel, solvothermal, radio frequency sputtering, and hydrothermal process. In this paper, CdS was synthesized by hydrothermal process and used with a mixture of titanium dioxide anatase and rutile (TiO2(A+R)) to build the photoanode, whereas the counter electrode was made of nanocomposites of conductive polymer polyaniline (PANI) and multiwalled carbon nanotubes (MWCNTs) deposited on a fluorine-doped tin oxide substrate. Two morphologies of CdS have been obtained by using hydrothermal process: branched nanorods (CdSBR) and straight nanorods (CdSNR). The present work indicates that controlling the morphology of CdS is crucial to enhance the efficiency of DSSCs device. Indeed, the higher power conversion energy of 1.71% was achieved for a cell CdSBR-TiO2(A+R)/PANI-MWCNTs under 100 mW/cm2, whereas the power conversion energy of 0.97 and 0.83% for CdSNR-TiO2(A+R)/PANI-MWCNTs and TiO2(A+R)/PANI-MWCNTs, respectively. Therefore, by increasing the surface to volume ratio of CdS nanostructures and the crystallite size into those structures opens the way to low-cost chemical production of solar cells.
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Affiliation(s)
- Entidhar Alkuam
- Department of Physics and
Astronomy, University of Arkansas at Little
Rock, 2801 South University Avenue, Little Rock, Arkansas 72204, United States
| | - Emad Badradeen
- Department of Physics and
Astronomy, University of Arkansas at Little
Rock, 2801 South University Avenue, Little Rock, Arkansas 72204, United States
| | - Grégory Guisbiers
- Department of Physics and
Astronomy, University of Arkansas at Little
Rock, 2801 South University Avenue, Little Rock, Arkansas 72204, United States
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170
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Chang Y, Yoon YJ, Li G, Xu E, Yu S, Lu CH, Wang Z, He Y, Lin CH, Wagner BK, Tsukruk VV, Kang Z, Thadhani N, Jiang Y, Lin Z. All-Inorganic Perovskite Nanocrystals with a Stellar Set of Stabilities and Their Use in White Light-Emitting Diodes. ACS APPLIED MATERIALS & INTERFACES 2018; 10:37267-37276. [PMID: 30338971 DOI: 10.1021/acsami.8b13553] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
We report a simple, robust, and inexpensive strategy to enable all-inorganic CsPbX3 perovskite nanocrystals (NCs) with a set of markedly improved stabilities, that is, water stability, compositional stability, phase stability, and phase segregation stability via impregnating them in solid organic salt matrices (i.e., metal stearate; MSt). In addition to acting as matrices, MSt also functions as the ligand bound to the surface of CsPbX3 NCs, thereby eliminating the potential damage of NCs commonly encountered during purification as in copious past work. Quite intriguingly, the resulting CsPbX3-MSt nanocomposites display an outstanding suite of stabilities. First, they retain high emission in the presence of water because of the insolubility of MSt in water, signifying their excellent water stability. Second, anion exchange between CsPbBr3-MSt and CsPbI3-MSt nanocomposites is greatly suppressed. This can be ascribed to the efficient coating of MSt, thus effectively isolating the contact between CsPbBr3 and CsPbI3 NCs, reflecting notable compositional stability. Third, remarkably, after being impregnated by MSt, the resulting CsPbI3-MSt nanocomposites sustain the cubic phase of CsPbI3 and high emission, manifesting the strikingly improved phase stability. Finally, phase segregation of CsPbBr1.5I1.5 NCs is arrested via the MSt encapsulation (i.e., no formation of the respective CsPbBr3 and CsPbI3), thus rendering pure and stable photoluminescence (i.e., demonstration of phase segregation stability). Notably, when assembled into typical white light-emitting diode architecture, CsPbBr1.5I1.5-MSt nanocomposites exhibit appealing performance, including a high color rendering index ( Ra) and a low color temperature ( Tc). As such, the judicious encapsulation of perovskite NCs into organic salts represents a facile and robust strategy for creating high-quality solid-state luminophores for use in optoelectronic devices.
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Affiliation(s)
- Yajing Chang
- School of Materials Science and Engineering , Hefei University of Technology , Hefei 230009 , P. R. China
| | | | - Guopeng Li
- School of Materials Science and Engineering , Hefei University of Technology , Hefei 230009 , P. R. China
| | - Enze Xu
- School of Materials Science and Engineering , Hefei University of Technology , Hefei 230009 , P. R. China
| | | | | | | | | | | | | | | | | | | | - Yang Jiang
- School of Materials Science and Engineering , Hefei University of Technology , Hefei 230009 , P. R. China
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171
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Salinas Y, Hoerhager C, García-Fernández A, Resmini M, Sancenón F, Matínez-Máñez R, Brueggemann O. Biocompatible Phenylboronic-Acid-Capped ZnS Nanocrystals Designed As Caps in Mesoporous Silica Hybrid Materials for on-Demand pH-Triggered Release In Cancer Cells. ACS APPLIED MATERIALS & INTERFACES 2018; 10:34029-34038. [PMID: 30272435 DOI: 10.1021/acsami.8b13698] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Biocompatible ZnS-based nanocrystals capped with 4-mercaptophenylboronic acid (ZnS@B) have been size-designed as excellent pH-responsive gatekeepers on mesoporous silica nanoparticles (MSNs), which encapsulate fluorophore safranin O (S2-Saf) or anticancer drug epirubicin hydrochloride (S2-Epi) for delivery applications in cancer cells. In this novel hybrid system, the gate mechanism consists of reversible pH-sensitive boronate ester moieties linking the nanocrystals directly to the alcohol groups from silica surface scaffold, avoiding tedious intermediate functionalization steps. The ∼3 nm size of the ZnS@B nanocrystals was tailored to allow efficient sealing of the pore voids and achieve a "zero premature cargo release" at neutral pH (7.4). The system selectively released the cargo in acidic conditions (pH 5.4 and 3.0) because of the hydrolysis of the boronate esters, which unblocked the pore voids. Delivery of the cargo by off-on cycles was demonstrated by changes in pH from 7.4 to 3.0, showing its potential pH-switching behavior. Cellular uptake of these nanocarriers within human cervix adenocarcinoma (HeLa) cells was achieved and the controlled release of the chemotherapeutic drug epirubicin was shown to occur within the endogenous endosomal/lysosomal acidified cancer cell microenvironment and further diffused into the cytosol. Cytotoxicity tests done on the mesoporous support without cargo and covalently linked with ZnS@B nanocrystals as caps were negative, suggesting that the proposed system is biocompatible and can be considered as a very promising drug nanocarrier.
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Affiliation(s)
- Yolanda Salinas
- Institute of Polymer Chemistry (ICP), Johannes Kepler University Linz , Altenberger Strasse 69 , Linz 4040 , Austria
| | - Carolin Hoerhager
- Institute of Polymer Chemistry (ICP), Johannes Kepler University Linz , Altenberger Strasse 69 , Linz 4040 , Austria
| | - Alba García-Fernández
- Instituto Interuniversitario de Investigación de Reconocimiento Molecular y Desarrollo Tecnológico (IDM) , Universitat Politécnica de València, Universitat de València , Valencia , Spain
- CIBER de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN) , Madrid , Spain
| | - Marina Resmini
- Department of Chemistry and Biochemistry, SBCS , Queen Mary University of London , Mile End Road , London E1 4NS , United Kingdom
| | - Félix Sancenón
- Instituto Interuniversitario de Investigación de Reconocimiento Molecular y Desarrollo Tecnológico (IDM) , Universitat Politécnica de València, Universitat de València , Valencia , Spain
- CIBER de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN) , Madrid , Spain
- Departamento de Química , Universidad Politécnica de Valencia , Camino de Vera s/n , Valencia E-46022 , Spain
| | - Ramón Matínez-Máñez
- Instituto Interuniversitario de Investigación de Reconocimiento Molecular y Desarrollo Tecnológico (IDM) , Universitat Politécnica de València, Universitat de València , Valencia , Spain
- CIBER de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN) , Madrid , Spain
- Departamento de Química , Universidad Politécnica de Valencia , Camino de Vera s/n , Valencia E-46022 , Spain
| | - Oliver Brueggemann
- Institute of Polymer Chemistry (ICP), Johannes Kepler University Linz , Altenberger Strasse 69 , Linz 4040 , Austria
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172
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Luan C, Gökçinar ÖÖ, Rowell N, Kreouzis T, Han S, Zhang M, Fan H, Yu K. Evolution of Two Types of CdTe Magic-Size Clusters from a Single Induction Period Sample. J Phys Chem Lett 2018; 9:5288-5295. [PMID: 30169042 DOI: 10.1021/acs.jpclett.8b02334] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
There are two types of colloidal semiconductor nanocrystals (NCs) that exhibit band gap absorption that is relatively sharp compared to conventional quantum dots (QDs). One type displays an absorption doublet, while the other displays an absorption singlet. Here, we report the evolution of the two types of NCs at room temperature from a single CdTe sample extracted during the induction period (IP) prior to nucleation and growth of conventional QDs. The resulting NCs exhibit band gap absorption peaking at ∼371 nm and are magic-size clusters (MSCs), labeled as dMSC-371 and sMSC-371 for the doublet and singlet cases, respectively. We demonstrate that dMSC-371 (with another peak at ∼350 nm) evolves when the sample is incubated. When the sample is dispersed without incubation into a toluene and octylamine mixture, dMSC-371 or sMSC-371 grows depending on the amine amount. We propose that dMSC-371 and sMSC-371 are a pair of polymorphs (with identical CdTe core compositions). The present study brings insight into the formation relationship between dMSCs and sMSCs.
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Affiliation(s)
- Chaoran Luan
- Engineering Research Center in Biomaterials , Sichuan University , Chengdu 610065 , P. R. China
| | - Ömür Ö Gökçinar
- Engineering Research Center in Biomaterials , Sichuan University , Chengdu 610065 , P. R. China
| | - Nelson Rowell
- National Research Council Canada , Ottawa , Ontario K1A 0R6 , Canada
| | - Theo Kreouzis
- School of Physics and Astronomy , Queen Mary University of London , London E14NS , U.K
| | - Shuo Han
- Institute of Atomic and Molecular Physics , Sichuan University , Chengdu 610065 , P. R. China
| | - Meng Zhang
- Institute of Atomic and Molecular Physics , Sichuan University , Chengdu 610065 , P. R. China
| | - Hongsong Fan
- Engineering Research Center in Biomaterials , Sichuan University , Chengdu 610065 , P. R. China
| | - Kui Yu
- Engineering Research Center in Biomaterials , Sichuan University , Chengdu 610065 , P. R. China
- Institute of Atomic and Molecular Physics , Sichuan University , Chengdu 610065 , P. R. China
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173
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Abstract
Point-of-care and in-field technologies for rapid, sensitive and selective detection of molecular biomarkers have attracted much interest. Rugged bioassay technology capable of fast detection of markers for pathogens and genetic diseases would in particular impact the quality of health care in the developing world, but would also make possible more extensive screening in developed countries to tackle problems such as those associated with water and food quality, and tracking of infectious organisms in hospitals and clinics. Literature trends indicate an increasing interest in the use of nanomaterials, and in particular luminescent nanoparticles, for assay development. These materials may offer attributes for development of assays and sensors that could achieve improvements in analytical figures of merit, and provide practical advantages in sensitivity and stability. There is opportunity for cost-efficiency and technical simplicity by implementation of luminescent nanomaterials as the basis for transduction technology, when combined with the use of paper substrates, and the ubiquitous availability of cell phone cameras and associated infrastructure for optical detection and transmission of results. Luminescent nanoparticles have been described for a broad range of bioanalytical targets including small molecules, oligonucleotides, peptides, proteins, saccharides and whole cells (e.g., cancer diagnostics). The luminescent nanomaterials that are described herein for paper-based bioassays include metal nanoparticles, quantum dots and lanthanide-doped nanocrystals. These nanomaterials often have broad and strong absorption and narrow emission bands that improve opportunity for multiplexed analysis, and can be designed to provide emission at wavelengths that are efficiently processed by conventional digital cameras. Luminescent nanoparticles can be embedded in paper substrates that are designed to direct fluid flow, and the resulting combination of technologies can offer competitive analytical performance at relatively low cost.
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Affiliation(s)
- Qiang Ju
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211816, P.R. China. and Chemical Sensors Group, Department of Chemical and Physical Sciences, University of Toronto Mississauga, 3359 Mississauga Road, ON, Canada L5L 1C6.
| | - M Omair Noor
- Chemical Sensors Group, Department of Chemical and Physical Sciences, University of Toronto Mississauga, 3359 Mississauga Road, ON, Canada L5L 1C6.
| | - Ulrich J Krull
- Chemical Sensors Group, Department of Chemical and Physical Sciences, University of Toronto Mississauga, 3359 Mississauga Road, ON, Canada L5L 1C6.
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174
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Li J, Wu H, Santana I, Fahlgren M, Giraldo JP. Standoff Optical Glucose Sensing in Photosynthetic Organisms by a Quantum Dot Fluorescent Probe. ACS APPLIED MATERIALS & INTERFACES 2018; 10:28279-28289. [PMID: 30058800 DOI: 10.1021/acsami.8b07179] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Glucose is a major product of photosynthesis and a key energy source for cellular respiration in organisms. Herein, we enable in vivo optical glucose sensing in wild-type plants using a quantum dot (QD) ratiometric approach. The optical probe is formed by a pair of QDs: thioglycolic acid-capped QDs which remain invariable to glucose (acting as an internal fluorescent reference control) and boronic acid (BA)-conjugated QDs (BA-QD) that quench their fluorescence in response to glucose. The fluorescence response of the QD probe is within the visible light window where photosynthetic tissues have a relatively low background. It is highly selective against other common sugars found in plants and can be used to quantify glucose levels above 500 μM in planta within the physiological range. We demonstrate that the QD fluorescent probe reports glucose from single chloroplast to algae cells ( Chara zeylanica) and plant leaf tissues ( Arabidopsis thaliana) in vivo via confocal microscopy and to a standoff Raspberry Pi camera setup. QD-based probes exhibit bright fluorescence, no photobleaching, tunable emission peak, and a size under plant cell wall porosity offering great potential for selective in vivo monitoring of glucose in photosynthetic organisms in situ.
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Affiliation(s)
- Jinming Li
- Department of Botany and Plant Sciences , University of California , Riverside , California 92521 , United States
| | - Honghong Wu
- Department of Botany and Plant Sciences , University of California , Riverside , California 92521 , United States
| | - Israel Santana
- Department of Botany and Plant Sciences , University of California , Riverside , California 92521 , United States
| | - Mackenzie Fahlgren
- Department of Botany and Plant Sciences , University of California , Riverside , California 92521 , United States
| | - Juan Pablo Giraldo
- Department of Botany and Plant Sciences , University of California , Riverside , California 92521 , United States
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175
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Engineered nanomaterials and human health: Part 1. Preparation, functionalization and characterization (IUPAC Technical Report). PURE APPL CHEM 2018. [DOI: 10.1515/pac-2017-0101] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Abstract
Nanotechnology is a rapidly evolving field, as evidenced by the large number of publications on the synthesis, characterization, and biological/environmental effects of new nano-sized materials. The unique, size-dependent properties of nanomaterials have been exploited in a diverse range of applications and in many examples of nano-enabled consumer products. In this account we focus on Engineered Nanomaterials (ENM), a class of deliberately designed and constructed nano-sized materials. Due to the large volume of publications, we separated the preparation and characterisation of ENM from applications and toxicity into two interconnected documents. Part 1 summarizes nanomaterial terminology and provides an overview of the best practices for their preparation, surface functionalization, and analytical characterization. Part 2 (this issue, Pure Appl. Chem. 2018; 90(8): 1325–1356) focuses on ENM that are used in products that are expected to come in close contact with consumers. It reviews nanomaterials used in therapeutics, diagnostics, and consumer goods and summarizes current nanotoxicology challenges and the current state of nanomaterial regulation, providing insight on the growing public debate on whether the environmental and social costs of nanotechnology outweigh its potential benefits.
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176
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Palomo V, Cistrone PA, Zhan N, Palui G, Mattoussi H, Dawson PE. Efficient Assembly of Quantum Dots with Homogenous Glycans Derived from Natural N-Linked Glycoproteins. Bioconjug Chem 2018; 29:3144-3153. [PMID: 30063825 DOI: 10.1021/acs.bioconjchem.8b00477] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Coating inorganic nanoparticles with polyethylene glycol (PEG)-appended ligands, as means to preserve their physical characteristics and promote steric interactions with biological systems, including enhanced aqueous solubility and reduced immunogenicity, has been explored by several groups. Conversely, macromolecules present in the human serum and on the surface of cells are densely coated with hydrophilic glycans that act to reduce nonspecific interactions, while facilitating specific binding and interactions. In particular, N-linked glycans are abundant on the surface of most serum proteins and are composed of a branched architecture that is typically characterized by a significant level of molecular heterogeneity. Here we provide two distinct methodologies, covalent bioconjugation and self-assembly, to functionalize two types of Quantum Dots with a homogeneous, complex-type N-linked glycan terminated with a sialic acid moiety. A detailed physical and functional characterization of these glycan-coated nanoparticles has been performed. Our findings support the potential use of such fluorescent platforms to sense glycan-involved biological processes, such as lectin recognition and sialidase-mediated hydrolysis.
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Affiliation(s)
- Valle Palomo
- Department of Chemistry , The Scripps Research Institute , La Jolla , California 92037 , United States
| | - Philip A Cistrone
- Department of Chemistry , The Scripps Research Institute , La Jolla , California 92037 , United States
| | - Naiqian Zhan
- Department of Chemistry and Biochemistry , Florida State University , Tallahassee , Florida 32306 , United States
| | - Goutam Palui
- Department of Chemistry and Biochemistry , Florida State University , Tallahassee , Florida 32306 , United States
| | - Hedi Mattoussi
- Department of Chemistry and Biochemistry , Florida State University , Tallahassee , Florida 32306 , United States
| | - Philip E Dawson
- Department of Chemistry , The Scripps Research Institute , La Jolla , California 92037 , United States
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177
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Ding C, Zhang Y, Liu F, Nakazawa N, Huang Q, Hayase S, Ogomi Y, Toyoda T, Wang R, Shen Q. Recombination Suppression in PbS Quantum Dot Heterojunction Solar Cells by Energy-Level Alignment in the Quantum Dot Active Layers. ACS APPLIED MATERIALS & INTERFACES 2018; 10:26142-26152. [PMID: 28862833 DOI: 10.1021/acsami.7b06552] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Using spatial energy-level gradient engineering with quantum dots (QDs) of different sizes to increase the generated carrier collection at the junction of a QD heterojunction solar cell (QDHSC) is a hopeful route for improving the energy-conversion efficiency. However, the results of current related research have shown that a variable band-gap structure in a QDHSC will create an appreciable increase, not in the illumination current density, but rather in the fill factor. In addition, there are a lack of studies on the mechanism of the effect of these graded structures on the photovoltaic performance of QDHSCs. This study presents the development of air atmosphere solution-processed TiO2/PbS QDs/Au QDHSCs by engineering the energy-level alignment (ELA) of the active layer via the use of a sorted order of differently sized QD layers (four QD sizes). In comparison to the ungraded device (without the ELA), the optimized graded architecture (containing the ELA) solar cells exhibited a great increase (21.4%) in short-circuit current density ( Jsc). As a result, a Jsc value greater than 30 mA/cm2 has been realized in planar, thinner absorption layer (∼300 nm) PbS QDHSCs, and the open-circuit voltage ( Voc) and power-conversion efficiency (PCE) were also improved. Through characterization by the light intensity dependences of the Jsc and Voc and transient photovoltage decay, we find that (i) the ELA structure, serving as an electron-blocking layer, reduces the interfacial recombination at the PbS/anode interface, and (ii) the ELA structure can drive more carriers toward the desirable collection electrode, and the additional carriers can fill the trap states, reducing the trap-assisted recombination in the PbS QDHSCs. This work has clearly elucidated the mechanism of the recombination suppression in the graded QDHSCs and demonstrated the effects of ELA structure on the improvement of Jsc. The charge recombination mechanisms characterized in this work would be able to shed light on further improvements of QDHSCs, which could even benefit other types of solar cells.
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Affiliation(s)
- Chao Ding
- Graduate School of Informatics and Engineering , The University of Electro-Communications , 1-5-1 Chofugaoka , Chofu , Tokyo 182-8585 , Japan
- China Scholarship Council, Level 13, Building A3, No.9 Chegongzhuang Avenue , Beijing 100044 , China
| | - Yaohong Zhang
- Graduate School of Informatics and Engineering , The University of Electro-Communications , 1-5-1 Chofugaoka , Chofu , Tokyo 182-8585 , Japan
| | - Feng Liu
- Graduate School of Informatics and Engineering , The University of Electro-Communications , 1-5-1 Chofugaoka , Chofu , Tokyo 182-8585 , Japan
| | - Naoki Nakazawa
- Graduate School of Informatics and Engineering , The University of Electro-Communications , 1-5-1 Chofugaoka , Chofu , Tokyo 182-8585 , Japan
| | - Qingxun Huang
- Graduate School of Informatics and Engineering , The University of Electro-Communications , 1-5-1 Chofugaoka , Chofu , Tokyo 182-8585 , Japan
| | - Shuzi Hayase
- Graduate School of Life Science and Systems Engineering , Kyushu Institute of Technology , 2-4 Hibikino , Wakamatsu-ku, Kitakyushu , Fukuoka 808-0196 , Japan
- CREST, Japan Science and Technology Agency (JST), 4-1-8 Honcho , Kawaguchi , Saitama 332-0012 , Japan
| | - Yuhei Ogomi
- Graduate School of Life Science and Systems Engineering , Kyushu Institute of Technology , 2-4 Hibikino , Wakamatsu-ku, Kitakyushu , Fukuoka 808-0196 , Japan
| | - Taro Toyoda
- Graduate School of Informatics and Engineering , The University of Electro-Communications , 1-5-1 Chofugaoka , Chofu , Tokyo 182-8585 , Japan
- CREST, Japan Science and Technology Agency (JST), 4-1-8 Honcho , Kawaguchi , Saitama 332-0012 , Japan
| | - Ruixiang Wang
- Beijing Engineering Research Centre of Sustainable Energy and Buildings , Beijing University of Civil Engineering and Architecture , No.15 Yongyuan Road , Huangcun, Daxing, Beijing 102616 , China
| | - Qing Shen
- Graduate School of Informatics and Engineering , The University of Electro-Communications , 1-5-1 Chofugaoka , Chofu , Tokyo 182-8585 , Japan
- CREST, Japan Science and Technology Agency (JST), 4-1-8 Honcho , Kawaguchi , Saitama 332-0012 , Japan
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178
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Goodman AJ, Dahod NS, Tisdale WA. Ultrafast Charge Transfer at a Quantum Dot/2D Materials Interface Probed by Second Harmonic Generation. J Phys Chem Lett 2018; 9:4227-4232. [PMID: 29995420 DOI: 10.1021/acs.jpclett.8b01606] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Hybrid quantum dot (QD)/transition metal dichalcogenide (TMD) heterostructures are attractive components of next generation optoelectronic devices, which take advantage of the spectral tunability of QDs and the charge and exciton transport properties of TMDs. Here, we demonstrate tunable electronic coupling between CdSe QDs and monolayer WS2 using variable length alkanethiol ligands on the QD surface. Using femtosecond time-resolved second harmonic generation (SHG) microscopy, we show that electron transfer from photoexcited CdSe QDs to single-layer WS2 occurs on ultrafast (50 fs to 1 ps) time scales. Moreover, in the samples exhibiting the fastest charge transfer rates (≤50 fs) we observed oscillations in the time-domain signal corresponding to an acoustic phonon mode of the donor QD, which coherently modulates the SHG response of the underlying WS2 layer. These results reveal surprisingly strong electronic coupling at the QD/TMD interface and demonstrate the usefulness of time-resolved SHG for exploring ultrafast electronic-vibrational dynamics in TMD heterostructures.
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Affiliation(s)
- Aaron J Goodman
- Department of Chemistry , Massachusetts Institute of Technology , Cambridge , Massachusetts 02139 , United States
| | - Nabeel S Dahod
- Department of Chemical Engineering , Massachusetts Institute of Technology , Cambridge , Massachusetts 02142 , United States
| | - William A Tisdale
- Department of Chemical Engineering , Massachusetts Institute of Technology , Cambridge , Massachusetts 02142 , United States
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179
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180
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Zhang Z, Ye Y, Pu C, Deng Y, Dai X, Chen X, Chen D, Zheng X, Gao Y, Fang W, Peng X, Jin Y. High-Performance, Solution-Processed, and Insulating-Layer-Free Light-Emitting Diodes Based on Colloidal Quantum Dots. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2018; 30:e1801387. [PMID: 29808563 DOI: 10.1002/adma.201801387] [Citation(s) in RCA: 63] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2018] [Revised: 04/08/2018] [Indexed: 05/12/2023]
Abstract
Quantum-dot light-emitting diodes (QLEDs) may combine superior properties of colloidal quantum dots (QDs) and advantages of solution-based fabrication techniques to realize high-performance, large-area, and low-cost electroluminescence devices. In the state-of-the-art red QLED, an ultrathin insulating layer inserted between the QD layer and the oxide electron-transporting layer (ETL) is crucial for both optimizing charge balance and preserving the QDs' emissive properties. However, this key insulating layer demands very accurate and precise control over thicknesses at sub-10 nm level, causing substantial difficulties for industrial production. Here, it is reported that interfacial exciton quenching and charge balance can be independently controlled and optimized, leading to devices with efficiency and lifetime comparable to those of state-of-the-art devices. Suppressing exciton quenching at the ETL-QD interface, which is identified as being obligatory for high-performance devices, is achieved by adopting Zn0.9 Mg0.1 O nanocrystals, instead of ZnO nanocrystals, as ETLs. Optimizing charge balance is readily addressed by other device engineering approaches, such as controlling the oxide ETL/cathode interface and adjusting the thickness of the oxide ETL. These findings are extended to fabrication of high-efficiency green QLEDs without ultrathin insulating layers. The work may rationalize the design and fabrication of high-performance QLEDs without ultrathin insulating layers, representing a step forward to large-scale production and commercialization.
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Affiliation(s)
- Zhenxing Zhang
- Centre for Chemistry of High-Performance & Novel Materials, State Key Laboratory of Silicon Materials, Department of Chemistry, Zhejiang University, Hangzhou, 310027, China
| | - Yuxun Ye
- State Key Laboratory of Silicon Materials, Centre for Chemistry of High-Performance & Novel Materials, School of Materials Science and Engineering, Hangzhou, 310027, China
| | - Chaodan Pu
- Centre for Chemistry of High-Performance & Novel Materials, Department of Chemistry, Hangzhou, 310027, China
| | - Yunzhou Deng
- Centre for Chemistry of High-Performance & Novel Materials, State Key Laboratory of Silicon Materials, Department of Chemistry, Zhejiang University, Hangzhou, 310027, China
| | - Xingliang Dai
- State Key Laboratory of Silicon Materials, Centre for Chemistry of High-Performance & Novel Materials, School of Materials Science and Engineering, Hangzhou, 310027, China
| | - Xiaopeng Chen
- Najing Technology Corporation LTD., Hangzhou, 310052, China
| | - Dong Chen
- Centre for Chemistry of High-Performance & Novel Materials, State Key Laboratory of Silicon Materials, Department of Chemistry, Zhejiang University, Hangzhou, 310027, China
| | - Xuerong Zheng
- Centre for Chemistry of High-Performance & Novel Materials, State Key Laboratory of Silicon Materials, Department of Chemistry, Zhejiang University, Hangzhou, 310027, China
| | - Yuan Gao
- Najing Technology Corporation LTD., Hangzhou, 310052, China
| | - Wei Fang
- Center for Chemistry of High-Performance & Novel Materials, State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou, 310027, China
| | - Xiaogang Peng
- Centre for Chemistry of High-Performance & Novel Materials, Department of Chemistry, Hangzhou, 310027, China
- Najing Technology Corporation LTD., Hangzhou, 310052, China
| | - Yizheng Jin
- Centre for Chemistry of High-Performance & Novel Materials, State Key Laboratory of Silicon Materials, Department of Chemistry, Zhejiang University, Hangzhou, 310027, China
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181
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Heo K, Miesch C, Na JH, Emrick T, Hayward RC. Assembly of P3HT/CdSe nanowire networks in an insulating polymer host. SOFT MATTER 2018; 14:5327-5332. [PMID: 29901063 DOI: 10.1039/c8sm01001c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Nanoparticles may act as compatibilizing agents for blending of immiscible polymers, leading to changes in blend morphology through a variety of mechanisms including interfacial adsorption, aggregation, and nucleation of polymer crystals. Herein, we report an approach to define highly structured donor/acceptor networks based on poly(3-hexylthiophene) (P3HT) and CdSe quantum dots (QDs) by demixing from an insulating polystyrene (PS) matrix. The incorporation of QDs led to laterally phase-separated co-continuous structures with sub-micrometer dimensions, and promoted crystallization of P3HT, yielding highly interconnected P3HT/QD hybrid nanowires embedded in the polymer matrix. These nanohybrid materials formed by controlling phase separation, interfacial activity, and crystallization within ternary donor/acceptor/insulator blends, offer attractive morphologies for potential use in optoelectronics.
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Affiliation(s)
- Kyuyoung Heo
- Polymer Science and Engineering Department, University of Massachusetts, Amherst, Massachusetts 01003, USA.
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182
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Das TK, Ilaiyaraja P, Sudakar C. Whispering Gallery Mode Enabled Efficiency Enhancement: Defect and Size Controlled CdSe Quantum Dot Sensitized Whisperonic Solar Cells. Sci Rep 2018; 8:9709. [PMID: 29946160 PMCID: PMC6018832 DOI: 10.1038/s41598-018-27969-y] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2018] [Accepted: 06/13/2018] [Indexed: 11/24/2022] Open
Abstract
A synergetic approach of employing smooth mesoporous TiO2 microsphere (SμS-TiO2)–nanoparticulate TiO2 (np-TiO2) composite photoanode, and size and defect controlled CdSe quantum dots (QD) to achieve high efficiency (η) in a modified Grätzel solar cell, quantum dot sensitized whisperonic solar cells (QDSWSC), is reported. SμS-TiO2 exhibits whispering gallery modes (WGM) and assists in enhancing the light scattering. SμS-TiO2 and np-TiO2 provide conductive path for efficient photocurrent charge transport and sensitizer loading. The sensitizer strongly couples with the WGM and significantly enhances the photon absorption to electron conversion. The efficiency of QDSWSC is shown to strongly depend on the size and defect characteristics of CdSe QD. Detailed structural, optical, microstructural and Raman spectral studies on CdSe QD suggest that surface defects are prominent for size ~2.5 nm, while the QD with size > 4.5 nm are well crystalline with lower surface defects. QDSWSC devices exhibit an increase in η from ≈0.46% to η ≈ 2.74% with increasing CdSe QD size. The reported efficiency (2.74%) is the highest compared to other CdSe based QDSSC made using TiO2 photoanode and I−/I3− liquid electrolyte. The concept of using whispering gallery for enhanced scattering is very promising for sensitized whisperonic solar cells.
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Affiliation(s)
- Tapan Kumar Das
- Multifunctional Materials Laboratory, Department of Physics, Indian Institute of Technology Madras, Chennai, 600036, India
| | - P Ilaiyaraja
- Multifunctional Materials Laboratory, Department of Physics, Indian Institute of Technology Madras, Chennai, 600036, India
| | - C Sudakar
- Multifunctional Materials Laboratory, Department of Physics, Indian Institute of Technology Madras, Chennai, 600036, India.
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183
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Huang X, Parashar VK, Gijs MAM. Nucleation and Growth Behavior of CdSe Nanocrystals Synthesized in the Presence of Oleylamine Coordinating Ligand. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:6070-6076. [PMID: 29747502 DOI: 10.1021/acs.langmuir.7b01337] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
We established the dual role played by oleylamine (OAm) during the synthesis of CdSe nanocrystals (NCs) by the hot injection method. Earlier reports suggest its role either as nucleating or as passivating agent in controlling the growth of CdSe NCs. Remarkably, by exploring four different synthesis routes, in which the reactant addition, timing, and concentration were varied, we found that both these two phenomena coexist and control synthesis. While examining if there is any effect of concentration of OAm on this synthesis, we found that at lower contents of OAm (<0.5 mmol) it prominently acts as an agent acting on nucleation, increasing the number of nuclei, reducing the nuclei (initial monomer units) size, and thereby increasing the NCs concentration resulting in a small NCs size, down to 2.7 nm. Whereas at higher contents (>1.0 mmol), it served more as a passivating agent by deterring both nucleation and growth processes, so generating fewer NCs with larger size up to 3.6 nm. Thus, adjusting the influence between nucleation and passivation, we can better control the final NCs size and so tune their size-dependent optical properties.
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Affiliation(s)
- X Huang
- Laboratory of Microsystems , Ecole Polytechnique Fédérale de Lausanne (EPFL) , CH-1015 Lausanne , Switzerland
| | - V K Parashar
- Laboratory of Microsystems , Ecole Polytechnique Fédérale de Lausanne (EPFL) , CH-1015 Lausanne , Switzerland
| | - M A M Gijs
- Laboratory of Microsystems , Ecole Polytechnique Fédérale de Lausanne (EPFL) , CH-1015 Lausanne , Switzerland
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184
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Nabar GM, Winter JO, Wyslouzil BE. Nanoparticle packing within block copolymer micelles prepared by the interfacial instability method. SOFT MATTER 2018; 14:3324-3335. [PMID: 29652417 DOI: 10.1039/c8sm00425k] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The interfacial instability method has emerged as a viable approach for encapsulating high concentrations of nanoparticles (NPs) within morphologically diverse micelles. In this method, transient interfacial instabilities at the surface of an emulsion droplet guide self-assembly of block co-polymers and NP encapsulants. Although used by many groups, there are no systematic investigations exploring the relationship between NP properties and micelle morphology. Here, the effect of quantum dot (QD) and superparamagnetic iron oxide NP (SPION) concentration on the shape, size, and surface deformation of initially spherical poly(styrene-b-ethylene oxide) (PS-b-PEO) micelles was examined. Multi-NP encapsulation and uniform dispersion within micelles was obtained even at low NP concentrations. Increasing NP concentration initially resulted in larger numbers of elongated micelles and cylinders with tightly-controlled diameters smaller than those of spherical micelles. Beyond a critical NP concentration, micelle formation was suppressed; the dominant morphology became densely-loaded NP structures that were coated with polymer and exhibited increased polydispersity. Transmission electron microscopy (TEM) and small angle X-ray scattering (SAXS) revealed that NPs in densely-loaded structures can be well-ordered, with packing volume fractions of up to 24%. These effects were enhanced in magnetic composites, possibly by dipole interactions. Mechanisms governing phase transitions triggered by NP loading in the interfacial instability process were proposed. The current study helps establish and elucidate the active role played by NPs in directing block copolymer assembly in the interfacial instability process, and provides important guiding principles for the use of this approach in generating NP-loaded block copolymer composites.
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Affiliation(s)
- Gauri M Nabar
- William G. Lowrie Department of Chemical and Biomolecular Engineering, The Ohio State University, 151 W. Woodruff Ave., Columbus, OH 43210, USA.
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185
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Onishi H, Ido S, Aoi R, Hosaka M, Honda S, Furumi S. One-pot Synthesis of Silver Indium Sulfide Ternary Semiconductor Nanocrystals with Highly Luminescent Performance from Low-toxic Precursors. CHEM LETT 2018. [DOI: 10.1246/cl.171168] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Hikaru Onishi
- Department of Applied Chemistry, Faculty of Science, Tokyo University of Science (TUS), 1-3 Kagurazaka, Shinjuku, Tokyo 162-8601, Japan
| | - Satomi Ido
- Department of Applied Chemistry, Faculty of Science, Tokyo University of Science (TUS), 1-3 Kagurazaka, Shinjuku, Tokyo 162-8601, Japan
| | - Ryo Aoi
- Department of Applied Chemistry, Faculty of Science, Tokyo University of Science (TUS), 1-3 Kagurazaka, Shinjuku, Tokyo 162-8601, Japan
| | - Makoto Hosaka
- Department of Applied Chemistry, Faculty of Science, Tokyo University of Science (TUS), 1-3 Kagurazaka, Shinjuku, Tokyo 162-8601, Japan
| | - Satoshi Honda
- Department of Applied Chemistry, Faculty of Science, Tokyo University of Science (TUS), 1-3 Kagurazaka, Shinjuku, Tokyo 162-8601, Japan
| | - Seiichi Furumi
- Department of Applied Chemistry, Faculty of Science, Tokyo University of Science (TUS), 1-3 Kagurazaka, Shinjuku, Tokyo 162-8601, Japan
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186
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Mao G, Liu C, Du M, Zhang Y, Ji X, He Z. One-pot synthesis of the stable CdZnTeS quantum dots for the rapid and sensitive detection of copper-activated enzyme. Talanta 2018; 185:123-131. [PMID: 29759178 DOI: 10.1016/j.talanta.2018.03.054] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2017] [Revised: 03/15/2018] [Accepted: 03/16/2018] [Indexed: 10/17/2022]
Abstract
Galactose oxidase is a copper-activated enzyme and have a vital role in metabolism of galactose. Much of the work is focused on determining the amount of galactose in the blood rather than measuring the amount of galactose oxidase to urge the galactosemia patients to restrict milk intake. Here, a simple and effective method was developed for Cu2+ and copper-activated enzyme detection based on homogenous alloyed CdZnTeS quantum dots (QDs). Meso- 2,3-dimercaptosuccinic acid (DMSA) was used as the reducing agent for preparing QDs and the highest quantum yield of CdZnTeS QDs was 69.4%. In addition, the as-prepared CdZnTeS QDs show superior fluorescence properties, such as good photo-/chemical stability. The DMSA was the surface ligand of the QDs, containing abundant -SH and -COOH, thus the surface ligands have a high affinity with Cu2+. Therefore, this developed probe can be applied for Cu2+ and galactose oxidase detection and shows a good sensitivity in the buffer. Then, this probe was successfully used for Cu2+ and galactose oxidase detection in real samples with the satisfactory results. The proposed fluorescence quenching strategy gives a new and simple insight for enzyme assay without the enzyme-catalyzed reaction.
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Affiliation(s)
- Guobin Mao
- Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, People's Republic of China
| | - Chen Liu
- Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, People's Republic of China
| | - Mingyuan Du
- Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, People's Republic of China
| | - Yuwei Zhang
- Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, People's Republic of China
| | - Xinghu Ji
- Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, People's Republic of China
| | - Zhike He
- Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, People's Republic of China.
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187
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Zhang H, Chen J, Xiao C, Tao Y, Wang X. A Multifunctional Polypeptide via Ugi Reaction for Compact and Biocompatible Quantum Dots with Efficient Bioconjugation. Bioconjug Chem 2018; 29:1335-1343. [DOI: 10.1021/acs.bioconjchem.8b00072] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Hang Zhang
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Renmin Street 5625, Changchun 130022, People’s Republic of China
- University of Chinese Academy of Sciences, Beijing 100039, People’s Republic of China
| | - Jinlong Chen
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Renmin Street 5625, Changchun 130022, People’s Republic of China
| | - Chunsheng Xiao
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Renmin Street 5625, Changchun 130022, People’s Republic of China
| | - Youhua Tao
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Renmin Street 5625, Changchun 130022, People’s Republic of China
| | - Xianhong Wang
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Renmin Street 5625, Changchun 130022, People’s Republic of China
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188
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Pu Y, Cai F, Wang D, Wang JX, Chen JF. Colloidal Synthesis of Semiconductor Quantum Dots toward Large-Scale Production: A Review. Ind Eng Chem Res 2018. [DOI: 10.1021/acs.iecr.7b04836] [Citation(s) in RCA: 172] [Impact Index Per Article: 28.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Yuan Pu
- State
Key Laboratory of Organic−Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China
- Research
Center of the Ministry of Education for High Gravity Engineering and
Technology, Beijing University of Chemical Technology, Beijing 100029, China
| | - Fuhong Cai
- Department
of Electrical Engineering, Mechanical and Electrical Engineering College, Hainan University, Haikou 570228, China
| | - Dan Wang
- State
Key Laboratory of Organic−Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China
- Research
Center of the Ministry of Education for High Gravity Engineering and
Technology, Beijing University of Chemical Technology, Beijing 100029, China
| | - Jie-Xin Wang
- State
Key Laboratory of Organic−Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China
- Research
Center of the Ministry of Education for High Gravity Engineering and
Technology, Beijing University of Chemical Technology, Beijing 100029, China
| | - Jian-Feng Chen
- State
Key Laboratory of Organic−Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China
- Research
Center of the Ministry of Education for High Gravity Engineering and
Technology, Beijing University of Chemical Technology, Beijing 100029, China
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189
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Zeng H, Li L, Ding Y, Zhuang Q. Simple and selective determination of 6-thioguanine by using polyethylenimine (PEI) functionalized carbon dots. Talanta 2018; 178:879-885. [DOI: 10.1016/j.talanta.2017.09.087] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2017] [Revised: 09/19/2017] [Accepted: 09/30/2017] [Indexed: 02/07/2023]
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190
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Hu Y, Han J, Ge L, Guo R. Viscoelastic wormlike micelles formed by ionic liquid-type surfactant [C 16imC 8]Br towards template-assisted synthesis of CdS quantum dots. SOFT MATTER 2018; 14:789-796. [PMID: 29308491 DOI: 10.1039/c7sm02223a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
In this paper, viscoelastic wormlike micelles consisting of cationic liquid-type surfactant, 1-hexadecyl-3-octyl imidazolium bromide ([C16imC8]Br), water and different additives were utilized for the synthesis of CdS quantum dots. First, the influence of different additives, such as [Cd(NH3)6]Cl2 and ethanethioamid (precursors for the synthesis of CdS quantum dots), and temperature on the viscoelasticity of the [C16imC8]Br aqueous solution was studied by dynamic and steady rheology. Furthermore, the synthesized CdS quantum dots and their photoluminescence properties were characterized by transmission electron microscopy (TEM), UV-Vis absorption spectroscopy, X-ray diffraction (XRD) and energy-dispersive X-ray spectroscopy (EDX). In the end, the mechanism for the synthesis of CdS quantum dots in [C16imC8]Br wormlike micelles is proposed.
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Affiliation(s)
- Yimin Hu
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, 225002, P. R. China.
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191
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Ali H, Ghosh S, Jana NR. Biomolecule-derived Fluorescent Carbon Nanoparticle as Bioimaging Probe. ACTA ACUST UNITED AC 2018. [DOI: 10.1557/adv.2018.80] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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192
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Chen J, Zhu C, Yang Z, Wang P, Yue Y, Kitaoka T. Thermally Tunable Pickering Emulsions Stabilized by Carbon-Dot-Incorporated Core-Shell Nanospheres with Fluorescence "On-Off" Behavior. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:273-283. [PMID: 29227679 DOI: 10.1021/acs.langmuir.7b03490] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Lack of deep understanding of nanoparticle (NP) actions at oil/water interface set an obstacle to practical applications of Pickering emulsions. Fluorescence labels fabricated by incorporation of carbon dots (CDs) into poly(N-isopropylacrylamide) (PNIPAM) matrix can not only mark the action of PNIPAM-based NPs in the interface but also reflect the colloidal morphologies of PNIPAM. In this work, we employed coaxial electrospraying for fabricating core-shell nanospheres of cellulose acetate encapsulated by PNIPAM, and facile incorporation of CDs in PNIPAM shells was achieved simultaneously. The coaxial electrosprayed NPs (CENPs) with temperature-dependent wettability can stabilize heptane and toluene in water at 25 °C, respectively, and reversible emulsion break can be triggered by temperature adjustment around the low critical solution temperature (LCST). Remarkably, CENP/CD composites exhibited a fluorescence "on-off" behavior because of the volume phase transition of the PNIPAM shell. CENP/CD composites in Pickering emulsions clearly elucidated the motions of CENPs in response to temperature changes. At temperatures below the LCST, the CENP concentration played an important role in surface coverage of oil droplets. Specifically, the CENP concentration above the minimum concentration for complete emulsification of oil phase led to high surface coverage and two-domain adsorption of CENPs at the interface including primary monolayer anchoring of CENPs on droplets surrounded by interconnected CENP networks, which contributed to the superior stability of the emulsions. Moreover, CENP/CD composites can be recycled with well-preserved core-shell structure and stable fluorescent properties, which offers their great potential applications in sensors and imaging.
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Affiliation(s)
- Jianqiang Chen
- Laboratory of Advanced Environmental & Energy Storage Materials, Department of Environment Engineering, Nanjing Forestry University , 159 Longpan Road, Nanjing 210037, P. R. China
| | - Chenyang Zhu
- Laboratory of Advanced Environmental & Energy Storage Materials, Department of Environment Engineering, Nanjing Forestry University , 159 Longpan Road, Nanjing 210037, P. R. China
| | - Zhen Yang
- School of Chemistry and Materials Science, Jiangsu Provincial Key Laboratory of Material Cycling and Pollution Control, Nanjing Normal University , 1 Wenyuan Road, Nanjing 210023, P. R. China
| | - Ping Wang
- Laboratory of Advanced Environmental & Energy Storage Materials, Department of Environment Engineering, Nanjing Forestry University , 159 Longpan Road, Nanjing 210037, P. R. China
| | - Yiying Yue
- Laboratory of Advanced Environmental & Energy Storage Materials, Department of Environment Engineering, Nanjing Forestry University , 159 Longpan Road, Nanjing 210037, P. R. China
| | - Takuya Kitaoka
- Department of Agro-Environmental Sciences, Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University , 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan
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193
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Solution-Processed Efficient Nanocrystal Solar Cells Based on CdTe and CdS Nanocrystals. COATINGS 2018. [DOI: 10.3390/coatings8010026] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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194
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Enright MJ, Cossairt BM. Synthesis of tailor-made colloidal semiconductor heterostructures. Chem Commun (Camb) 2018; 54:7109-7122. [DOI: 10.1039/c8cc03498b] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
This feature article provides an account of the various bottom-up and top-down methods that have been developed to prepare colloidal heterostructures and highlights the benefits of a seeded assembly approach for greater control and customizability.
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195
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Nejdl L, Zelnickova J, Vaneckova T, Hynek D, Adam V, Vaculovicova M. Rapid preparation of self-assembled CdTe quantum dots used for sensing of DNA in urine. NEW J CHEM 2018. [DOI: 10.1039/c7nj05167k] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
In this article, the authors report a systematic study of the self-assembly of CdTe quantum dots (QDs) stabilized by mercaptosuccinic acid (MSA) at laboratory temperature (25 °C) or after thermal treatment (90 °C).
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Affiliation(s)
- Lukas Nejdl
- Department of Chemistry and Biochemistry
- Mendel University in Brno
- CZ 613 00 Brno
- Czech Republic
- Central European Institute of Technology
| | - Jaroslava Zelnickova
- Department of Chemistry and Biochemistry
- Mendel University in Brno
- CZ 613 00 Brno
- Czech Republic
| | - Tereza Vaneckova
- Department of Chemistry and Biochemistry
- Mendel University in Brno
- CZ 613 00 Brno
- Czech Republic
| | - David Hynek
- Department of Chemistry and Biochemistry
- Mendel University in Brno
- CZ 613 00 Brno
- Czech Republic
- Central European Institute of Technology
| | - Vojtech Adam
- Department of Chemistry and Biochemistry
- Mendel University in Brno
- CZ 613 00 Brno
- Czech Republic
- Central European Institute of Technology
| | - Marketa Vaculovicova
- Department of Chemistry and Biochemistry
- Mendel University in Brno
- CZ 613 00 Brno
- Czech Republic
- Central European Institute of Technology
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196
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Zhou Y, Zhao H, Ma D, Rosei F. Harnessing the properties of colloidal quantum dots in luminescent solar concentrators. Chem Soc Rev 2018; 47:5866-5890. [DOI: 10.1039/c7cs00701a] [Citation(s) in RCA: 126] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
This review summarizes the recent progress, challenges and perspectives of luminescent solar concentrators based on colloidal quantum dots via harnessing their properties.
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Affiliation(s)
- Yufeng Zhou
- Énergie Matériaux Télécommunications Research Centre
- Institut National de la Recherche Scientifique
- Varennes
- Canada
| | - Haiguang Zhao
- College of Physics & The Cultivation Base for State Key Laboratory
- Qingdao University
- P. R. China
| | - Dongling Ma
- Énergie Matériaux Télécommunications Research Centre
- Institut National de la Recherche Scientifique
- Varennes
- Canada
| | - Federico Rosei
- Énergie Matériaux Télécommunications Research Centre
- Institut National de la Recherche Scientifique
- Varennes
- Canada
- Institute of Fundamental and Frontier Sciences
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197
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Khan MD, Aamir M, Sohail M, Sher M, Baig N, Akhtar J, Malik MA, Revaprasadu N. Bis(selenobenzoato)dibutyltin(iv) as a single source precursor for the synthesis of SnSe nanosheets and their photo-electrochemical study for water splitting. Dalton Trans 2018; 47:5465-5473. [DOI: 10.1039/c8dt00285a] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
A new organo tin complex has been synthesized and used as a single source precursor for the synthesis of tin selenide nanosheets and deposition of thin films.
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Affiliation(s)
- Malik Dilshad Khan
- Department of Chemistry
- University of Zululand
- South Africa
- School of Materials
- The University of Manchester
| | - Muhammad Aamir
- Department of Chemistry
- Allama Iqbal Open University
- Islamabad
- Pakistan
| | - Manzar Sohail
- Center of Research Excellence in Nanotechnology
- King Fahd University of Petroleum and Minerals
- Dhahran 31261
- Saudi Arabia
| | - Muhammad Sher
- Department of Chemistry
- Allama Iqbal Open University
- Islamabad
- Pakistan
| | - Nadeem Baig
- Department of Chemistry
- King Fahd University of Petroleum and Minerals
- Dhahran 31261
- Saudi Arabia
| | - Javeed Akhtar
- Materials Lab
- Department of Chemistry
- Mirpur University of Science and Technology
- Mirpur AJK
- Pakistan
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198
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Xu Y, Chen W, Ding X, Pan X, Hu L, Yang S, Zhu J, Dai S. An ultrathin SiO2 blocking layer to suppress interfacial recombination for efficient Sb2S3-sensitized solar cells. Inorg Chem Front 2018. [DOI: 10.1039/c8qi00076j] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
An SiO2 thin layer efficiently suppresses the recombination at the TiO2/Sb2S3 interface and enhances the photovoltaic performance of Sb2S3 sensitized solar cells.
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Affiliation(s)
- Yafeng Xu
- Key Laboratory of Photovoltaic and Energy Conservation Materials
- Institute of Applied Technology
- Hefei Institutes of Physical Science
- Chinese Academy of Sciences
- Hefei 230031
| | - Wenyong Chen
- Key Laboratory of Photovoltaic and Energy Conservation Materials
- Institute of Applied Technology
- Hefei Institutes of Physical Science
- Chinese Academy of Sciences
- Hefei 230031
| | - Xihong Ding
- Beijing Key Laboratory of Novel Thin Film Solar Cells
- North China Electric Power University
- Beijing 102206
- China
| | - Xu Pan
- Key Laboratory of Photovoltaic and Energy Conservation Materials
- Institute of Applied Technology
- Hefei Institutes of Physical Science
- Chinese Academy of Sciences
- Hefei 230031
| | - Linhua Hu
- Key Laboratory of Photovoltaic and Energy Conservation Materials
- Institute of Applied Technology
- Hefei Institutes of Physical Science
- Chinese Academy of Sciences
- Hefei 230031
| | - Shangfeng Yang
- Hefei National Laboratory for Physical Sciences at Microscale
- Key Laboratory of Materials for Energy Conversion
- Chinese Academy of Sciences
- Department of Materials Science and Engineering
- Synergetic Innovation Center of Quantum Information & Quantum Physics
| | - Jun Zhu
- Key Laboratory of Photovoltaic and Energy Conservation Materials
- Institute of Applied Technology
- Hefei Institutes of Physical Science
- Chinese Academy of Sciences
- Hefei 230031
| | - Songyuan Dai
- Beijing Key Laboratory of Novel Thin Film Solar Cells
- North China Electric Power University
- Beijing 102206
- China
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199
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Ramalingam G, Saravanan KV, Vizhi TK, Rajkumar M, Baskar K. Synthesis of water-soluble and bio-taggable CdSe@ZnS quantum dots. RSC Adv 2018; 8:8516-8527. [PMID: 35539869 PMCID: PMC9078530 DOI: 10.1039/c7ra13400b] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2017] [Accepted: 02/08/2018] [Indexed: 11/21/2022] Open
Abstract
Many synthesized semiconductor QDs materials are formed using trioctylphosphine oxide (TOPO) but it requires high temperature, is very expensive and is also hydrophobic. Our study deals with selective syntheses of CdSe and core–shell CdSe/ZnS quantum dots (QDs) in aqueous solution by a simple heating and refluxing method. It is more hydrophilic, needs less temperature, is economically viable and is eco-friendly. Bio-ligands, such as thioacetamide, itaconic acid and glutathione, were used as stabilizers for the biosynthesis of QDs. A simplified aqueous route was used to improve the quality of the colloidal nanocrystals. As a result, highly monodisperse, photoluminescent and biocompatible nanoparticles were obtained. The synthesized QDs were characterized by XRD, FTIR, confocal microscopy, ultraviolet (UV) absorption and photoluminescence (PL). The size of synthesized QDs was observed as 5.74 nm and the core–shell shape was confirmed by using XRD and confocal microscopy respectively. The QD nanoparticles showed antibacterial activity against pathogenic bacteria. The QDs could be applied for biological labelling, fluorescence bio-sensing and bio-imaging etc. Mystristic capped CdSe QDs with schematic diagram and formation mechanism of bio-taggable CdSe@ZnS QDs.![]()
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Affiliation(s)
- G. Ramalingam
- Department of Nanoscience and Technology
- Alagappa University
- India
| | | | - T. Kayal Vizhi
- Department of Physics
- Central University of Tamil Nadu
- India
| | - M. Rajkumar
- Department of Environmental Sciences
- Bharathiyar University
- Coimbatore
- India
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200
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Loghina L, Grinco M, Iakovleva A, Slang S, Palka K, Vlcek M. Mechanistic investigation of the sulfur precursor evolution in the synthesis of highly photoluminescent Cd 0.15Zn 0.85S quantum dots. NEW J CHEM 2018. [DOI: 10.1039/c8nj03077d] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A comparison of four synthetic approaches for highly photoluminescent blue-emitting Cd0.15Zn0.85S QDs using (Z)-1-(octadec-9-enyl)-3-phenylthiourea as a source of sulfur.
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Affiliation(s)
- Liudmila Loghina
- Center of Materials and Nanotechnologies
- Faculty of Chemical Technology
- University of Pardubice
- Pardubice 532 10
- Czech Republic
| | - Marina Grinco
- Center of Materials and Nanotechnologies
- Faculty of Chemical Technology
- University of Pardubice
- Pardubice 532 10
- Czech Republic
| | - Anastasia Iakovleva
- Center of Materials and Nanotechnologies
- Faculty of Chemical Technology
- University of Pardubice
- Pardubice 532 10
- Czech Republic
| | - Stanislav Slang
- Center of Materials and Nanotechnologies
- Faculty of Chemical Technology
- University of Pardubice
- Pardubice 532 10
- Czech Republic
| | - Karel Palka
- Center of Materials and Nanotechnologies
- Faculty of Chemical Technology
- University of Pardubice
- Pardubice 532 10
- Czech Republic
| | - Miroslav Vlcek
- Center of Materials and Nanotechnologies
- Faculty of Chemical Technology
- University of Pardubice
- Pardubice 532 10
- Czech Republic
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