1
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Johst F, Rebmann J, Werners H, Klemeyer L, Kopula Kesavan J, Koziej D, Strelow C, Bester G, Mews A, Kipp T. Exciton-Phonon Coupling in Single ZnCdSe-Dot/CdS-Rod Nanocrystals with Engineered Band Gaps from Type-II to Type-I. ACS PHOTONICS 2024; 11:3741-3749. [PMID: 39310298 PMCID: PMC11413927 DOI: 10.1021/acsphotonics.4c00931] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/21/2024] [Revised: 08/29/2024] [Accepted: 08/29/2024] [Indexed: 09/25/2024]
Abstract
Exciton-phonon coupling limits the homogeneous emission line width of nanocrystals. Hence, a full understanding of this is crucial. In this work, we statistically investigate exciton-phonon coupling by performing single-particle spectroscopy on colloidal Zn1-x Cd x Se/CdS and CdSe/CdS dot-in-rod nanocrystals at cryogenic temperatures (T ≈ 10 K). In situ cation exchange enables us to analyze different band alignments and, thereby, different charge-carrier distributions. We find that the relative intensities of the longitudinal optical S- and Se-type phonon replicas correlate with the charge-carrier distribution. Our experimental findings are complemented with quantum mechanical calculations within the effective mass approximation that hint at the relevance of surface charges.
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Affiliation(s)
- Florian Johst
- Institute
of Physical Chemistry, University of Hamburg, Grindelallee 117, Hamburg D-20416, Germany
| | - Jannik Rebmann
- Institute
of Physical Chemistry, University of Hamburg, Grindelallee 117, Hamburg D-20416, Germany
| | - Hans Werners
- Institute
of Physical Chemistry, University of Hamburg, Grindelallee 117, Hamburg D-20416, Germany
| | - Lars Klemeyer
- Institute
of Nanostructure and Solid State Physics, University of Hamburg, Luruper Chaussee 149, Hamburg D-22761, Germany
| | - Jagadesh Kopula Kesavan
- Institute
of Nanostructure and Solid State Physics, University of Hamburg, Luruper Chaussee 149, Hamburg D-22761, Germany
| | - Dorota Koziej
- Institute
of Nanostructure and Solid State Physics, University of Hamburg, Luruper Chaussee 149, Hamburg D-22761, Germany
| | - Christian Strelow
- Institute
of Physical Chemistry, University of Hamburg, Grindelallee 117, Hamburg D-20416, Germany
| | - Gabriel Bester
- Institute
of Physical Chemistry, University of Hamburg, Grindelallee 117, Hamburg D-20416, Germany
- The
Hamburg Centre for Ultrafast Imaging, Luruper Chaussee 149, Hamburg 22761, Germany
| | - Alf Mews
- Institute
of Physical Chemistry, University of Hamburg, Grindelallee 117, Hamburg D-20416, Germany
| | - Tobias Kipp
- Institute
of Physical Chemistry, University of Hamburg, Grindelallee 117, Hamburg D-20416, Germany
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2
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Jin G, Zeng Y, Liu X, Wang Q, Wei J, Liu F, Li H. Synthesis and Optical Properties of CdSeTe/CdZnS/ZnS Core/Shell Nanorods. NANOMATERIALS (BASEL, SWITZERLAND) 2024; 14:989. [PMID: 38869614 PMCID: PMC11173580 DOI: 10.3390/nano14110989] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2024] [Revised: 05/29/2024] [Accepted: 06/05/2024] [Indexed: 06/14/2024]
Abstract
Semiconductor nanorods (NRs) have great potential in optoelectronic devices for their unique linearly polarized luminescence which can break the external quantum efficiency limit of light-emitting diodes (LEDs) based on spherical quantum dots. Significant progress has been made for developing red, green, and blue light-emitting NRs. However, the synthesis of NRs emitting in the deep red region, which can be used for accurate red LED displays and promoting plant growth, is currently less explored. Here, we report the synthesis of deep red CdSeTe/CdZnS/ZnS dot-in-rod core/shell NRs via a seeded growth method, where the doping of Te in the CdSe core can extend the NR emission to the deep red region. The rod-shaped CdZnS shell is grown over CdSeTe seeds. By growing a ZnS passivation shell, the CdSeTe/CdZnS/ZnS NRs exhibit a photoluminescence emission peak at 670 nm, a full width at a half maximum of 61 nm and a photoluminescence quantum yield of 45%. The development of deep red NRs can greatly extend the applications of anisotropic nanocrystals.
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Affiliation(s)
- Geyu Jin
- Beijing Key Laboratory of Construction-Tailorable Advanced Functional Materials and Green Applications, Experimental Center of Advanced Materials, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China; (G.J.); (Y.Z.); (X.L.); (J.W.)
| | - Yicheng Zeng
- Beijing Key Laboratory of Construction-Tailorable Advanced Functional Materials and Green Applications, Experimental Center of Advanced Materials, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China; (G.J.); (Y.Z.); (X.L.); (J.W.)
| | - Xiao Liu
- Beijing Key Laboratory of Construction-Tailorable Advanced Functional Materials and Green Applications, Experimental Center of Advanced Materials, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China; (G.J.); (Y.Z.); (X.L.); (J.W.)
| | - Qingya Wang
- Advanced Research Institute of Multidisciplinary Sciences, Beijing Institute of Technology, Zhuhai 519088, China; (Q.W.); (F.L.)
- Advanced Research Institute of Multidisciplinary Sciences, Beijing Institute of Technology, Beijing 100081, China
| | - Jing Wei
- Beijing Key Laboratory of Construction-Tailorable Advanced Functional Materials and Green Applications, Experimental Center of Advanced Materials, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China; (G.J.); (Y.Z.); (X.L.); (J.W.)
| | - Fangze Liu
- Advanced Research Institute of Multidisciplinary Sciences, Beijing Institute of Technology, Zhuhai 519088, China; (Q.W.); (F.L.)
- Advanced Research Institute of Multidisciplinary Sciences, Beijing Institute of Technology, Beijing 100081, China
| | - Hongbo Li
- Beijing Key Laboratory of Construction-Tailorable Advanced Functional Materials and Green Applications, Experimental Center of Advanced Materials, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China; (G.J.); (Y.Z.); (X.L.); (J.W.)
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3
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Chai Y, Li T, Zhang M, Liu M, Yang G, Karvinen P, Kuittinen M, Kang G. Brilliant quantum dots' photoluminescence from a dual-resonance plasmonic grating. OPTICS EXPRESS 2024; 32:19950-19962. [PMID: 38859116 DOI: 10.1364/oe.521561] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2024] [Accepted: 04/09/2024] [Indexed: 06/12/2024]
Abstract
Semiconductor quantum dots (QDs) have recently caused a stir as a promising and powerful lighting material applied in real-time fluorescence detection, display, and imaging. Photonic nanostructures are well suited for enhancing photoluminescence (PL) due to their ability to tailor the electromagnetic field, which raises both radiative and nonradiative decay rate of QDs nearby. However, several proposed structures with a complicated manufacturing process or low PL enhancement hinder their application and commercialization. Here, we present two kinds of dual-resonance gratings to effectively improve PL enhancement and propose a facile fabrication method based on holographic lithography. A maximum of 220-fold PL enhancement from CdSe/CdS/ZnS QDs are realized on 1D Al-coated photoresist (PR) gratings, where dual resonance bands are excited to simultaneously overlap the absorption and emission bands of QDs, much larger than those of some reported structures. Giant PL enhancement realized by cost-effective method further suggests the potential of better developing the nanostructure to QD-based optical and optoelectronic devices.
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4
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Zeng Y, Liu X, Liu Y, Chen W, Liu F, Li H. 22% Record Efficiency in Nanorod Light-Emitting Diodes Achieved by Gradient Shells. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024; 36:e2310705. [PMID: 38377984 DOI: 10.1002/adma.202310705] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2023] [Revised: 01/08/2024] [Indexed: 02/22/2024]
Abstract
The external quantum efficiency (EQE) in light-emitting diodes (LEDs) based on isotropic quantum dots has approached the theoretical limit of close to 20%. Anisotropic nanorods can break this limit by taking advantage of their directional emission. However, the progress towards higher EQE by using CdSe/CdS nanorods (NRs) faces several challenges, primarily involving the low quantum yield and unbalanced charge injection in devices. Herein, the seeded growth method is modified and anisotropic nanorods are obtained with photoluminescence quantum yield up to 98% by coating a gradient alloyed CdZnSe shell around conventional spherical CdSe seeds. This intermediate alloyed CdZnSe shell combined with a subsequent rod-shaped CdZnS/ZnS shell can effectively suppress the electron delocalization in the typical CdSe/CdS nanorods due to their small conduction bandgap offset. Additionally, this alloyed shell can reduce the hole-injection barrier and create a larger barrier for electron injection, both effects promoting a balanced injection of electrons and holes in LEDs. Hence, LEDs are reached with high brightness (160341 cd m-2) and high efficiency (EQE = 22%, current efficiency = 23.19 cd A-1), which are the highest values to date for nanorod LEDs.
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Affiliation(s)
- Yicheng Zeng
- Experimental Center of Advanced Materials, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081, China
| | - Xiaonan Liu
- Experimental Center of Advanced Materials, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081, China
| | - Yuan Liu
- State Key Laboratory of Molecular Reaction Dynamics and Dynamics Research Center for Energy and Environmental Materials, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning, 116023, China
| | - Weiwei Chen
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
| | - Fangze Liu
- Advanced Research Institute of Multidisciplinary Sciences, Beijing Institute of Technology, Beijing, 100081, China
| | - Hongbo Li
- Experimental Center of Advanced Materials, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081, China
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5
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Hu M, Hu X, Wang G, Cheng Y, Yu X, Huang X, Li Y. A fluorescent lateral flow immunoassay based on CdSe/CdS/ZnS quantum dots for sensitive detection of olaquindox in feedstuff. Food Chem 2023; 419:136025. [PMID: 37030205 DOI: 10.1016/j.foodchem.2023.136025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2022] [Revised: 03/15/2023] [Accepted: 03/21/2023] [Indexed: 04/07/2023]
Abstract
A portable fluorescence immunosensor based on the CdSe/CdS/ZnS quantum dots (QDs) with multiple-shell structure was fabricated for the precise quantification of olaquindox (OLA). The QDs labeled anti-OLA antibody used as bioprobe played an important role in the design and preparation of a lateral flow test strip. Due to the strong fluorescent intensity of QDs, the sensitivity is greatly improved. The quantitative results were obtained using a fluorescent strip scan reader within 8 min, and the calculated limit of detection for OLA at 0.12 µg/kg, which was 2.7 times more sensitive than that of the conventional colloidal gold-based strips method. Acceptable recovery of 85.0%-95.5% was obtained by the spiked samples. This newly established QDs-based strip immunoassay method is suitable for the on-site detection and rapid initial screening of OLA in swine feedstuff, and is potentially applied for the detection of other veterinary drugs to ensure food safety.
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6
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Bai B, Zhang C, Dou Y, Kong L, Wang L, Wang S, Li J, Zhou Y, Liu L, Liu B, Zhang X, Hadar I, Bekenstein Y, Wang A, Yin Z, Turyanska L, Feldmann J, Yang X, Jia G. Atomically flat semiconductor nanoplatelets for light-emitting applications. Chem Soc Rev 2023; 52:318-360. [PMID: 36533300 DOI: 10.1039/d2cs00130f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The last decade has witnessed extensive breakthroughs and significant progress in atomically flat two-dimensional (2D) semiconductor nanoplatelets (NPLs) in terms of synthesis, growth mechanisms, optical and electronic properties and practical applications. Such NPLs have electronic structures similar to those of quantum wells in which excitons are predominantly confined along the vertical direction, while electrons are free to move in the lateral directions, resulting in unique optical properties, such as extremely narrow emission line width, short photoluminescence (PL) lifetime, high gain coefficient, and giant oscillator strength transition (GOST). These unique optical properties make NPLs favorable for high color purity light-emitting applications, in particular in light-emitting diodes (LEDs), backlights for liquid crystal displays (LCDs) and lasers. This review article first introduces the intrinsic characteristics of 2D semiconductor NPLs with atomic flatness. Subsequently, the approaches and mechanisms for the controlled synthesis of atomically flat NPLs are summarized followed by an insight on recent progress in the mediation of core/shell, core/crown and core/crown@shell structures by selective epitaxial growth of passivation layers on different planes of NPLs. Moreover, an overview of the unique optical properties and the associated light-emitting applications is elaborated. Despite great progress in this research field, there are some issues relating to heavy metal elements such as Cd2+ in NPLs, and the ambiguous gain mechanisms of NPLs and others are the main obstacles that prevent NPLs from widespread applications. Therefore, a perspective is included at the end of this review article, in which the current challenges in this stimulating research field are discussed and possible solutions to tackle these challenges are proposed.
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Affiliation(s)
- Bing Bai
- Key Lab for Special Functional Materials, Ministry of Education, National and Local Joint Engineering Research Center for High-Efficiency Display and Lighting Technology, School of Materials Science and Engineering, and Collaborative Innovation Center of Nano Functional Materials and Applications, Henaon University, Kaifeng 475004, China
| | - Chengxi Zhang
- Key Laboratory of Advanced Display and System Applications of Ministry of Education, Shanghai University, Shanghai 200072, China.
| | - Yongjiang Dou
- Key Laboratory of Advanced Display and System Applications of Ministry of Education, Shanghai University, Shanghai 200072, China.
| | - Lingmei Kong
- Key Laboratory of Advanced Display and System Applications of Ministry of Education, Shanghai University, Shanghai 200072, China.
| | - Lin Wang
- Key Laboratory of Advanced Display and System Applications of Ministry of Education, Shanghai University, Shanghai 200072, China.
| | - Sheng Wang
- Key Laboratory of Advanced Display and System Applications of Ministry of Education, Shanghai University, Shanghai 200072, China.
| | - Jun Li
- Key Lab for Special Functional Materials, Ministry of Education, National and Local Joint Engineering Research Center for High-Efficiency Display and Lighting Technology, School of Materials Science and Engineering, and Collaborative Innovation Center of Nano Functional Materials and Applications, Henaon University, Kaifeng 475004, China
| | - Yi Zhou
- Key Lab for Special Functional Materials, Ministry of Education, National and Local Joint Engineering Research Center for High-Efficiency Display and Lighting Technology, School of Materials Science and Engineering, and Collaborative Innovation Center of Nano Functional Materials and Applications, Henaon University, Kaifeng 475004, China
| | - Long Liu
- Key Lab for Special Functional Materials, Ministry of Education, National and Local Joint Engineering Research Center for High-Efficiency Display and Lighting Technology, School of Materials Science and Engineering, and Collaborative Innovation Center of Nano Functional Materials and Applications, Henaon University, Kaifeng 475004, China
| | - Baiquan Liu
- School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, China
| | - Xiaoyu Zhang
- Key Laboratory of Automobile Materials, Ministry of Education, College of Materials Science and Engineering, Jilin Provincial International Cooperation Key Laboratory of High-Efficiency Clean Energy Materials, Electron Microscopy Center, Jilin University, Changchun 130012, China
| | - Ido Hadar
- Institute of Chemistry, and the Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
| | - Yehonadav Bekenstein
- Department of Materials Science and Engineering, Technion-Israel Institute of Technology, Haifa 32000, Israel
| | - Aixiang Wang
- School of Chemistry and Chemical Engineering, Linyi University, Linyi 276005, P. R. China
| | - Zongyou Yin
- Research School of Chemistry, The Australian National University, ACT 2601, Australia
| | - Lyudmila Turyanska
- Faculty of Engineering, The University of Nottingham, Additive Manufacturing Building, Jubilee Campus, University Park, Nottingham NG7 2RD, UK
| | - Jochen Feldmann
- Chair for Photonics and Optoelectronics, Nano-Institute Munich and Department of Physics, Ludwig-Maximilians-Universität (LMU), Königinstr. 10, Munich 80539, Germany
| | - Xuyong Yang
- Key Laboratory of Advanced Display and System Applications of Ministry of Education, Shanghai University, Shanghai 200072, China.
| | - Guohua Jia
- School of Molecular and Life Sciences, Curtin University, Perth, WA 6102, Australia.
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7
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Lu X, Hou X, Tang H, Yi X, Wang J. A High-Quality CdSe/CdS/ZnS Quantum-Dot-Based FRET Aptasensor for the Simultaneous Detection of Two Different Alzheimer's Disease Core Biomarkers. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:nano12224031. [PMID: 36432316 PMCID: PMC9697525 DOI: 10.3390/nano12224031] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2022] [Revised: 11/06/2022] [Accepted: 11/12/2022] [Indexed: 05/31/2023]
Abstract
The simultaneous detection of two different biomarkers for the point-of-care diagnosis of major diseases, such as Alzheimer’s disease (AD), is greatly challenging. Due to the outstanding photoluminescence (PL) properties of quantum dots (QDs), a high-quality CdSe/CdS/ZnS QD-based fluorescence resonance energy transfer (FRET) aptasensor for simultaneously monitoring the amyloid-β oligomers (AβO) and tau protein was proposed. By engineering the interior inorganic structure and inorganic−organic interface, water-soluble dual-color CdSe/CdS/ZnS QDs with a near-unity PL quantum yield (>90%) and mono-exponential PL decay dynamics were generated. The π−π stacking and hydrogen bond interaction between the aptamer-functionalized dual-color QDs and gold nanorods@polydopamine (Au NRs@PDA) nanoparticles resulted in significant fluorescence quenching of the QDs through FRET. Upon the incorporation of the AβO and tau protein, the fluorescence recovery of the QDs-DNA/Au NRs@PDA assembly was attained, providing the possibility of simultaneously assaying the two types of AD core biomarkers. The lower detection limits of 50 pM for AβO and 20 pM for the tau protein could be ascribed to the distinguishable and robust fluorescence of QDs and broad spectral absorption of Au NRs@PDA. The sensing strategy serves as a viable platform for the simultaneously monitoring of the core biomarkers for AD and other major diseases.
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Affiliation(s)
- Xingchang Lu
- Hunan Provincial Key Laboratory of Micro & Nano Materials Interface Science, College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China
| | - Xiaoqi Hou
- School of Chemistry and Material Science, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, 1 Sub-lane Xiangshan, Hangzhou 310024, China
- Key Laboratory of Intelligent Sensing Materials and Chip Integration Technology of Zhejiang Province, Hangzhou Innovation Institute, Beihang University, Hangzhou 310052, China
| | - Hailin Tang
- SunYat-sen University Cancer Center, State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangzhou 510060, China
| | - Xinyao Yi
- Hunan Provincial Key Laboratory of Micro & Nano Materials Interface Science, College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China
| | - Jianxiu Wang
- Hunan Provincial Key Laboratory of Micro & Nano Materials Interface Science, College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China
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8
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Facile synthesis of Cu2+ ion-doped CdOZn3(PO4)2 hybrid composite and their optical and photoluminescence properties. CHEMICAL PAPERS 2022. [DOI: 10.1007/s11696-022-02508-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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9
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Mallem K, Prodanov MF, Dezhang C, Marus M, Kang C, Shivarudraiah SB, Vashchenko VV, Halpert JE, Srivastava AK. Solution-Processed Red, Green, and Blue Quantum Rod Light-Emitting Diodes. ACS APPLIED MATERIALS & INTERFACES 2022; 14:18723-18735. [PMID: 35417119 DOI: 10.1021/acsami.2c04466] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Solution-processed semiconductor nanocrystals are evolving as potential candidates for future display and lighting applications owing to their size-tunable emission, ultrasaturated colors, and compatibility with large-area flexible substrates. Among them, quantum rods (QRs) are emerging materials for optoelectronic applications, offering polarized emission, high light outcoupling efficiency, color purity, and better stability in solid films. However, synthesizing QRs covering the full visible wavelength region has been a big challenge, particularly in the blue range. Herein, we report for the first time the synthesis of red CdSe/CdS, green CdSe/ZnxCd1-xS/ZnS, and blue CdSe/ZnxCd1-xS/ZnS QRs and their application in red, green, and blue QR-based light-emitting diodes (QR-LEDs). We have improved the charge injection balance into the QRs through embedding a poly(methyl methacrylate) (PMMA) layer between the emissive and electron transport layers. The thin PMMA electron-blocking layer (EBL) suppresses the excessive electron flux and thus promotes charge injection balance and pushes the recombination zone back to the QR layer, resulting in 1.35×, 1.2×, and 1.7× peak external quantum efficiency improvement for red, green, and blue QR-LEDs, respectively. The efficiency roll-off of green and blue QR-LEDs with an EBL is less than 50% at maximum current density. The proposed red, green, and blue QR-LEDs open up an avenue toward further improving the light source efficiency and stability focusing on real device applications.
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Affiliation(s)
- Kumar Mallem
- State Key Laboratory on Advanced Displays and Optoelectronics Technologies and Centre for Display Research, Department of Electronics and Computer Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong 999077, China
| | - Maksym F Prodanov
- State Key Laboratory on Advanced Displays and Optoelectronics Technologies and Centre for Display Research, Department of Electronics and Computer Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong 999077, China
| | - Chen Dezhang
- Department of Chemistry, Hong Kong University of Science and Technology (HKUST), Clear Water Bay Road, Kowloon, Hong Kong 999077, China
| | - Mikita Marus
- State Key Laboratory on Advanced Displays and Optoelectronics Technologies and Centre for Display Research, Department of Electronics and Computer Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong 999077, China
| | - Chengbin Kang
- State Key Laboratory on Advanced Displays and Optoelectronics Technologies and Centre for Display Research, Department of Electronics and Computer Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong 999077, China
| | - Sunil B Shivarudraiah
- Department of Chemistry, Hong Kong University of Science and Technology (HKUST), Clear Water Bay Road, Kowloon, Hong Kong 999077, China
| | - Valeri V Vashchenko
- State Key Laboratory on Advanced Displays and Optoelectronics Technologies and Centre for Display Research, Department of Electronics and Computer Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong 999077, China
| | - Jonathan E Halpert
- Department of Chemistry, Hong Kong University of Science and Technology (HKUST), Clear Water Bay Road, Kowloon, Hong Kong 999077, China
| | - Abhishek K Srivastava
- State Key Laboratory on Advanced Displays and Optoelectronics Technologies and Centre for Display Research, Department of Electronics and Computer Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong 999077, China
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10
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Ratnaweera RJ, Rodríguez Ortiz FA, Gripp NJ, Sheldon MT. Quantifying Order during Field-Driven Alignment of Colloidal Semiconductor Nanorods. ACS NANO 2022; 16:3834-3842. [PMID: 35188744 DOI: 10.1021/acsnano.1c08488] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Aligning large populations of colloidal nanorods (NRs) into ordered assemblies provides a strategy for engineering macroscopic functional materials with strong optical anisotropy. The bulk optical properties of such systems depend not only on the individual NR building blocks but also on their meso- and macroscale ordering, in addition to more complex interparticle coupling effects. Here, we investigate the dynamic alignment of colloidal CdSe/CdS NRs in the presence of AC electric fields by measuring concurrent changes in optical transmission. Our work identifies two distinct scales of interaction that give rise to the field-driven optical response: (1) the spontaneous mesoscale self-assembly of colloidal NRs into structures with increased optical anisotropy and (2) the macroscopic ordering of NR assemblies along the direction of the applied AC field. By modeling the alignment of NR ensembles using directional statistics, we experimentally quantify the maximum degree of order in terms of the average deviation angle relative to the field axis. Results show a consistent improvement in alignment as a function of NR concentration─with a minimum average deviation of 36.2°─indicating that mesoscale assembly helps facilitate field-driven alignment of colloidal NRs.
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Affiliation(s)
- Rivi J Ratnaweera
- Department of Chemistry, Texas A&M University, College Station, Texas 77843-3255, United States
| | | | - Nicholas J Gripp
- Department of Materials Science & Engineering, Texas A&M University, College Station, Texas 77843-3255, United States
| | - Matthew T Sheldon
- Department of Chemistry, Texas A&M University, College Station, Texas 77843-3255, United States
- Department of Materials Science & Engineering, Texas A&M University, College Station, Texas 77843-3255, United States
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11
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Hafez AA, Salimi A, Jamali Z, Shabani M, Sheikhghaderi H. Overview of the application of inorganic nanomaterials in breast cancer diagnosis. INORG NANO-MET CHEM 2022. [DOI: 10.1080/24701556.2021.2025085] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Asghar Ashrafi Hafez
- Cancer Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Ahmad Salimi
- Department of Pharmacology and Toxicology, School of Pharmacy, Ardabil University of Medical Sciences, Ardabil, Iran
- Traditional Medicine and Hydrotherapy Research Center, Ardabil University of Medical Sciences, Ardabil, Iran
| | - Zhaleh Jamali
- Student Research Committee, School of Medicine, Shahroud University of Medical Sciences, Shahroud, Iran
| | - Mohammad Shabani
- Student Research Committee, School of Pharmacy, Ardabil University of Medical Sciences, Ardabil, Iran
| | - Hiva Sheikhghaderi
- Student Research Committee, School of Paramedical, Kermanshah University of Medical Sciences, Kermanshah, Iran
- Bukan Shahid Gholipour Hospital, Urmia University of Medical Sciences, Bukan, Iran
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12
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Kuroi K, Yamada M, Kawamura I, Jung M, Pack CG, Fujii F. FTIR study of the surface-ligand exchange reaction with glutathione on biocompatible rod-shaped CdSe/CdS semiconductor nanocrystals. Phys Chem Chem Phys 2022; 24:13356-13364. [DOI: 10.1039/d2cp00574c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Semiconductor nanocrystals (SNCs) are an essential optical tool in the life sciences. Application of SNCs to living systems requires that their surfaces be covered with biocompatible molecules. The surface capping...
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13
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Beckwith JS, Yang H. Information bounds in determining the 3D orientation of a single emitter or scatterer using point-detector-based division-of-amplitude polarimetry. J Chem Phys 2021; 155:144110. [PMID: 34654316 DOI: 10.1063/5.0065034] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Determining the 3D orientation of a single molecule or particle, encoded in its polar and azimuthal angles, is of interest for a variety of fields, being relevant to a range of questions in elementary chemical reactivity, biomolecular motors, and nanorheology. A popular experimental method, known as division-of-amplitude polarimetry, for determining the real-time orientation of a single particle is to split the emitted/scattered light into multiple polarizations and to measure the light intensity using point detectors at these polarizations during a time interval Δt. Here, we derive the Cramér-Rao lower bounds for this method from the perspective of information theory in the cases of utilizing a chromophore or a scattering particle as a 3D orientation probe. Such Cramér-Rao lower bounds are new for using this experimental method to measure the full 3D orientation in both the scattering case and the fluorescence case. These results show that, for a scatterer, the information content of one photon is 1.16 deg-2 in the polar and 58.71 deg-2 in the azimuthal angles, respectively. For a chromophore, the information content of one photon is 2.54 deg-2 in the polar and 80.29 deg-2 in the azimuthal angles. In addition, the Cramér-Rao lower bound scales with the square root of the total signal photons. To determine orientation to an uncertainty of one degree requires 7.40 × 104 and 2.34 × 103 photons for the polar and the azimuthal angles, respectively, for fluorescence, whereas it takes 1.62 × 105 and 3.20 × 103 photons for scattering. This work provides experimentalists new guidelines by which future experiments can be designed and interpreted.
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Affiliation(s)
- Joseph S Beckwith
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA
| | - Haw Yang
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA
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Ibrahim SA, Chan Y. Fluorescent Semiconductor Nanorods for the Solid-Phase Polymerase Chain Reaction-Based, Multiplexed Gene Detection of Mycobacterium tuberculosis. ACS APPLIED MATERIALS & INTERFACES 2021; 13:35294-35305. [PMID: 34313114 DOI: 10.1021/acsami.1c05312] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
The spread of infectious diseases with significantly high mortality rates can wreak devastating damage on global health systems and economies, underscoring the need for better disease diagnostic platforms. Solid-phase polymerase chain reaction (SP-PCR) potentially combines the advantages of conventional PCR-based diagnostics with the capability of multiplexed detection, given that the spatial separation between primers circumvents unwanted primer-primer interactions. However, the generally low efficiency of solid-phase amplification results in poor sensitivity and limits its use in detection schemes. We present an SP-PCR-based, multiplexed pulldown fluorescence assay for the detection of Mycobacterium tuberculosis (MTB), utilizing highly fluorescent oligonucleotide-functionalized CdSe/CdS and CdSe1-xSx/CdS nanorods (NRs) as multicolor hybridization probes. The large surface area of the NRs allows for their easy capture and pulldown, but without contributing significantly to the interparticle photon reabsorption when clustered at the pulldown sites. The NR nanoprobes were specifically designed to target the hotspot regions of the rpoB gene of MTB, which have been implicated in resistance to standard rifampicin treatment. The implementation of the semiconductor NRs as photostable multicolor fluorophores in a multiplexed SP-PCR-based detection scheme allowed for the identification of multiple hotspot regions with sub-picomolar levels of sensitivity and high specificity in artificial sputum. While this work demonstrates the utility of semiconductor NRs as highly fluorescent chromophores that can enable SP-PCR as a sensitive and accurate technique for multipathogen diagnostics, the flexible surface chemistry of the NRs should allow them to be applicable to a wide variety of detection motifs.
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Affiliation(s)
- Salwa Ali Ibrahim
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
- National Institute of Laser Enhanced Sciences, Cairo University, Giza 12613, Egypt
| | - Yinthai Chan
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
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15
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Abu Saleh D, Sosnik A. Enhanced photoluminescence of boron nitride quantum dots by encapsulation within polymeric nanoparticles. NANOTECHNOLOGY 2021; 32:195104. [PMID: 33513592 DOI: 10.1088/1361-6528/abe155] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Boron nitride quantum dots (BNQDs) have been proposed as probes for bioimaging owing their to outstanding photoluminescent properties, although their hydrophobic nature and strong aggregation tendency in aqueous media limit their application in the biomedical field. In this work, we synthesize BNQDs by a liquid exfoliation-solvothermal process under pressure from boron nitride nanoparticles in N,N-dimethylformamide. The BNQDs display an average size of 3.3 ± 0.6 nm, as measured by transmission electron microscopy, and a (100) crystalline structure. In addition, a quantum yield of 21.75 ± 0.20% was achieved. To ensure complete dispersibility in water and prevent possible elimination by renal filtration upon injection, the BNQDs (20% w/w) are encapsulated within poly(ethylene glycol)-b-poly(epsilon-caprolactone) nanoparticles by a simple and scalable nanoprecipitation method, and hybrid nanocomposite particles with significantly stronger photoluminescence than their free counterparts are produced. Finally, their optimal cell compatibility and bioimaging features are demonstrated in vitro in murine macrophage and human rhabdomyosarcoma cell lines.
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Affiliation(s)
- Doaa Abu Saleh
- Laboratory of Pharmaceutical Nanomaterials Science, Department of Materials Science and Engineering, Technion-Israel Institute of Technology, Haifa, Israel
| | - Alejandro Sosnik
- Laboratory of Pharmaceutical Nanomaterials Science, Department of Materials Science and Engineering, Technion-Israel Institute of Technology, Haifa, Israel
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16
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Rreza I, Yang H, Hamachi L, Campos M, Hull T, Treadway J, Kurtin J, Chan EM, Owen JS. Performance of Spherical Quantum Well Down Converters in Solid State Lighting. ACS APPLIED MATERIALS & INTERFACES 2021; 13:12191-12197. [PMID: 33682411 DOI: 10.1021/acsami.0c15161] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
We report the color conversion performance of amber and red emitting quantum dots (QDs) on InGaN solid-state lighting (SSL) light emitting diode (LED) packages. Spherical quantum well (SQW) architectures (CdS/CdSe1-xSx/CdS) were prepared using a library of thio- and selenourea synthesis reagents and high throughput synthesis robotics. CdS/CdSe1-xSx QDs with narrow luminescence bands were coated with thick CdS shells (thickness = 1.6-7.5 nm) to achieve photoluminescence quantum yields (PLQY) up to 88% at amber and red emission wavelengths (λmax = 600-642 nm, FWHM < 45 nm). The photoluminescence from SQWs encapsulated in silicone and deposited on LED packages was monitored under accelerated aging conditions (oven temperature = 85 °C, relative humidity = 5-85%, blue optical power density = 3-45 W/cm2) by monitoring the red photon output over several hundred hours of continuous operation. The growth of a ZnS shell on the SQW surface increases the stability under long-term operation but also reduces the PLQY, especially of SQWs with thick CdS shells. The results illustrate that the outer ZnS shell layer is key to optimizing the PLQY and the long-term stability of QDs during operation on SSL packages.
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Affiliation(s)
- Iva Rreza
- Department of Chemistry, Columbia University, New York, New York 10027, United States
| | - Haoran Yang
- Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Leslie Hamachi
- Department of Chemistry, Columbia University, New York, New York 10027, United States
- Department of Chemistry and Biochemistry, California Polytechnic State University, San Luis Obispo, California 93407, United States
| | - Michael Campos
- Department of Chemistry, Columbia University, New York, New York 10027, United States
| | - Trevor Hull
- Department of Chemistry, Columbia University, New York, New York 10027, United States
| | - Joseph Treadway
- Pacific Light Technologies, Portland, Oregon 97201, United States
| | - Juanita Kurtin
- Pacific Light Technologies, Portland, Oregon 97201, United States
| | - Emory M Chan
- Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Jonathan S Owen
- Department of Chemistry, Columbia University, New York, New York 10027, United States
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17
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Kumar A, Kumar P. Cytotoxicity of quantum dots: Use of quasiSMILES in development of reliable models with index of ideality of correlation and the consensus modelling. JOURNAL OF HAZARDOUS MATERIALS 2021; 402:123777. [PMID: 33254788 DOI: 10.1016/j.jhazmat.2020.123777] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2020] [Revised: 07/30/2020] [Accepted: 08/15/2020] [Indexed: 05/23/2023]
Abstract
The assessment of cytotoxicity of quantum dots is very essential for environmental and health risk analysis. In the present work we have modelled HeLa cell cytotoxicity of sixty one CdSe quantum dots with ZnS shell as a function of its experimental conditions and molecular construction using quasiSMILES representations. The index of ideality of correlation helps in the building of ten statistically significant models having good fitting ability with value of R2 ranging from 0.8414 to 0.9609 for the training set. The split 5 model is rated as the best model with values of R2, Q2F1, Q2F2 and Q2F3 as 0.8964, 0.8267, 0.8264 and 0.8777 respectively for the calibration set. The extraction of features causing increase and decrease of cytotoxicity of quantum dots indicates importance of neutral surface charge, surface modified with protein, 72 h exposure time, combination of MTT assay with surface protein in decreasing the cytotoxicity. Amphiphilic polymer, polyol ligand with neutral charge, 0.5 - 0.6 nm quantum dot diameter with lipid ligand and unmodified positively charged surface are grouped in toxicity enhancer features. Further, consensus modelling using split 5 and 8 patterns enhances the prediction quality by increasing the R2val to 0.9361 and 0.9656 respectively.
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Affiliation(s)
- Ashwani Kumar
- Department of Pharmaceutical Sciences, Guru Jambheshwar University of Science and Technology, Hisar, Haryana, 125001, India.
| | - Parvin Kumar
- Department of Chemistry, Kurukshetra University, Kurukshetra, Haryana, 136119, India
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Prodanov MF, Gupta SK, Kang C, Diakov MY, Vashchenko VV, Srivastava AK. Thermally Stable Quantum Rods, Covering Full Visible Range for Display and Lighting Application. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2021; 17:e2004487. [PMID: 33345459 DOI: 10.1002/smll.202004487] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2020] [Revised: 11/09/2020] [Indexed: 06/12/2023]
Abstract
Recently, quantum rods (QRs) have been studied heavily for display and lighting applications. QRs offer serious advantages over the quantum dots such as higher light out-coupling coefficient, and polarized emission. The QR enhancement films double liquid crystal display efficiency. However, it is still a challenge to synthesize good quality green (λem ≈ 520 nm) and blue (λem ≈ 465 nm) emitting QRs, due to very large bathochromic shift during the shell growth. Furthermore, until now, the presence of cadmium in high-quality QRs is inevitable, but due to its toxicity, RoHS has restricted the amount of cadmium in consumer products. In this article, low Cd core-shell QRs, with a narrow-band luminescence spectrum tuned in the whole visible range, are prepared by replacing Cd with Zn in a one-pot post-synthetic development. These QRs possess the good thermal stability of photoluminescence properties, and therefore, show high performance for the on-chip LED configuration. The designed white LEDs (WLEDs) are characterized by a high brightness of 120000 nits, and color gamut covering 122% NTSC (90% of BT2020), in the 1931CIE color space. Additionally, these LEDs show a high luminous efficiency of 115 lm W-1 . Thus, these quantum rod LED are perfectly viable for display backlighting and lighting applications.
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Affiliation(s)
- Maksym F Prodanov
- State Key Laboratory on Advanced Displays and Optoelectronics Technologies, Department of Electronics and Computer Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
| | - Swadesh K Gupta
- State Key Laboratory on Advanced Displays and Optoelectronics Technologies, Department of Electronics and Computer Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
| | - Chengbin Kang
- State Key Laboratory on Advanced Displays and Optoelectronics Technologies, Department of Electronics and Computer Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
| | - Maksym Y Diakov
- State Key Laboratory on Advanced Displays and Optoelectronics Technologies, Department of Electronics and Computer Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
| | - Valerii V Vashchenko
- State Key Laboratory on Advanced Displays and Optoelectronics Technologies, Department of Electronics and Computer Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
| | - Abhishek K Srivastava
- State Key Laboratory on Advanced Displays and Optoelectronics Technologies, Department of Electronics and Computer Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
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19
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Huang L, Jin J, Ao L, Jiang C, Zhang Y, Wen HM, Wang J, Wang H, Hu J. Hierarchical Plasmonic-Fluorescent Labels for Highly Sensitive Lateral Flow Immunoassay with Flexible Dual-Modal Switching. ACS APPLIED MATERIALS & INTERFACES 2020; 12:58149-58160. [PMID: 33326226 DOI: 10.1021/acsami.0c18667] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Lateral flow immunoassay (LFIA), as a prominent point-of-care (POC) test platform, has been extensively adopted for rapid, on-site, and facile diagnosis of pathogen infections and disease biomarkers. Exploring novel structured optical labels of LFIA with amplified signal and complementary detection modes favors the sensitive and flexible POC diagnosis. Here, bimodal labels with both colorimetric and fluorescent readout were fabricated via a layered sequential assembly strategy based on affinity templates and hydrophobic metal-containing nanounits. High-quality colorimetric and fluorescent nanoparticles were densely incorporated into the colloidal supports and confined in separated regions, without interfering with each other. The hierarchical integration of gold nanoparticles and quantum dots with high loading density and good optical preservation realized dual readout and amplified signals from the assemblies of individual single nanoparticles. The "all-in-one" optical labels allowed both colorimetric and fluorescent detection of cystatin C (Cys C) after surface conjugation with antibodies. The LFIA strips revealed noninterfering dual signals for both visual inspection and quantitative detection of Cys C via the naked eye and portable devices, respectively. The limits of detection by colorimetric and fluorescent modes were 0.61 and 0.24 ng mL-1, respectively. The novel LFIA platform demonstrated sensitive, specific, and reproducible POC testing of biomarkers with flexible detection modes and was reliable for clinical diagnosis.
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Affiliation(s)
- Liang Huang
- College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, P. R. China
| | - Jiening Jin
- College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, P. R. China
| | - Lijiao Ao
- Institute of Biomedical Engineering, The Second Clinical Medical College (Shenzhen People's Hospital) of Jinan University, Shenzhen 518020, P. R. China
| | - Chenxing Jiang
- College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, P. R. China
| | - Yuxing Zhang
- College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, P. R. China
| | - Hui-Min Wen
- College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, P. R. China
| | - Jing Wang
- College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, P. R. China
| | - Haiyan Wang
- School of Chemistry and Chemical Engineering, Key Laboratory of Chemical Biosensor of Shanxi Province, Key Laboratory of National Forest and Grass Administration for the Application of Graphene in Forestry, Shanxi Datong University, Datong 037009, P. R. China
| | - Jun Hu
- College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, P. R. China
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Efficient and Stable CdSe/CdS/ZnS Quantum Rods-in-Matrix Assembly for White LED Application. NANOMATERIALS 2020; 10:nano10020317. [PMID: 32059468 PMCID: PMC7075110 DOI: 10.3390/nano10020317] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/22/2020] [Revised: 02/05/2020] [Accepted: 02/07/2020] [Indexed: 12/11/2022]
Abstract
CdSe/CdS core-shell quantum rods (QRs) are a promising prospect in optoelectronic applications but usually have a relatively low quantum efficiency and stability. Here, we report on an efficient and stable CdSe/CdS/ZnS QRs-in-matrix assembly (QRAs) by growing and embedding CdSe/CdS QRs in ZnS matrices. Structural characterizations show that the CdSe/CdS QRs are encapsulated and interconnected by ZnS in the QRAs structure. The stable ZnS encapsulation renders the CdSe/CdS QRs high quantum efficiency (QE) up to 85%. The QRAs also present high photo- and thermal-stability and can preserve 93% of the initial QE at 100 °C. The QRAs powder presents a light degradation of only 2% under continuous excitation for 100 h, displaying profound potential in optoelectronic applications. White light-emitting diodes (WLEDs) are fabricated by packaging the QRAs powder as phosphor on top of blue GaN chip. The WLED shows high optical performance and light quality.
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21
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Grabowska-Jadach I, Drozd M, Kulpińska D, Komendacka K, Pietrzak M. Modification of fluorescent nanocrystals with 6-thioguanine: monitoring of drug delivery. APPLIED NANOSCIENCE 2019. [DOI: 10.1007/s13204-019-01101-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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22
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Wan M, Zhang Y, Wei W, Cui S, Hou H, Chen W, Mi L. One‐Step Transformation from Cu
2
S Nanocrystal to CuS Nanocrystal with Photocatalytic Properties. ChemistrySelect 2019. [DOI: 10.1002/slct.201901387] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Mengli Wan
- College of Chemistry and Molecular EngineeringZhengzhou University Zhengzhou 450001 China
| | - Yingying Zhang
- Center for Advanced Materials ResearchZhongyuan University of Technology Zhengzhou 450007 China
| | - Wutao Wei
- Center for Advanced Materials ResearchZhongyuan University of Technology Zhengzhou 450007 China
| | - Shizhong Cui
- Center for Advanced Materials ResearchZhongyuan University of Technology Zhengzhou 450007 China
| | - Hongwei Hou
- College of Chemistry and Molecular EngineeringZhengzhou University Zhengzhou 450001 China
| | - Weihua Chen
- College of Chemistry and Molecular EngineeringZhengzhou University Zhengzhou 450001 China
| | - Liwei Mi
- Center for Advanced Materials ResearchZhongyuan University of Technology Zhengzhou 450007 China
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23
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Zhang Y, Zhang F, Wang H, Wang L, Wang F, Lin Q, Shen H, Li LS. High-efficiency CdSe/CdS nanorod-based red light-emitting diodes. OPTICS EXPRESS 2019; 27:7935-7944. [PMID: 31052619 DOI: 10.1364/oe.27.007935] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2018] [Accepted: 02/28/2019] [Indexed: 06/09/2023]
Abstract
In this paper, we report the synthesis, the structural and optical characterization of CdSe/CdS//CdS nanorods (NRs) and their exploitation in nanorod-based light-emitting diodes (NR-LEDs). Two kinds of NRs of CdSe/CdS and CdSe/CdS//CdS were incorporated into the structure of solution-processed hybrid NR-LEDs. Compared to CdSe/CdS, the efficiencies of CdSe/CdS//CdS NR-based LEDs are overwhelmingly higher, specifically showing unprecedented values of peak current efficiency of 19.8 cd/A and external quantum efficiency of 15.7%. Such excellent results are likely attributable to a unique structure in CdSe/CdS//CdS NRs with a relatively high quantum yield, thick CdS outer shell, and rod structure which minimize nonradiative energy transfer between closely packed NRs in emitting layer.
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24
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Milleville CC, Chen EY, Lennon KR, Cleveland JM, Kumar A, Zhang J, Bork JA, Tessier A, LeBeau JM, Chase DB, Zide JMO, Doty MF. Engineering Efficient Photon Upconversion in Semiconductor Heterostructures. ACS NANO 2019; 13:489-497. [PMID: 30576110 DOI: 10.1021/acsnano.8b07062] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Photon upconversion is a photophysical process in which two low-energy photons are converted into one high-energy photon. Photon upconversion has broad appeal for a range of applications from biomedical imaging and targeted drug release to solar energy harvesting. Current upconversion nanosystems, including lanthanide-doped nanocrystals and triplet-triplet annihilation molecules, have achieved upconversion quantum yields on the order of 10-30%. However, the performance of these materials is hampered by inherently narrow absorption cross sections and fixed energy levels originating in atomic, ionic, or molecular states. Semiconductors, on the other hand, have inherently wide absorption cross sections. Moreover, recent advances enable the synthesis of colloidal semiconductor nanoparticles with complex heterostructures that can control band alignments and tune optical properties. We synthesize and characterize a three-component heterostructure that successfully upconverts photons under continuous-wave illumination and solar-relevant photon fluxes. The heterostructure is composed of two cadmium selenide quantum dots (QDs), an absorber and emitter, spatially separated by a cadmium sulfide nanorod (NR). We demonstrate that the principles of semiconductor heterostructure engineering can be applied to engineer improved upconversion efficiency. We first eliminate electron trap states near the surface of the absorbing QD and then tailor the band gap of the NR such that charge carriers are funneled to the emitting QD. When combined, these two changes result in a 100-fold improvement in photon upconversion performance.
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Affiliation(s)
| | | | | | | | - Abinash Kumar
- Department of Materials Science and Engineering , North Carolina State University , Raleigh , North Carolina 27606 , United States
| | | | | | - Ansel Tessier
- The Tatnall School , Wilmington , Delaware 19807 , United States
| | - James M LeBeau
- Department of Materials Science and Engineering , North Carolina State University , Raleigh , North Carolina 27606 , United States
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25
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Bai X, Purcell-Milton F, Gun'ko YK. Optical Properties, Synthesis, and Potential Applications of Cu-Based Ternary or Quaternary Anisotropic Quantum Dots, Polytypic Nanocrystals, and Core/Shell Heterostructures. NANOMATERIALS 2019; 9:nano9010085. [PMID: 30634642 PMCID: PMC6359286 DOI: 10.3390/nano9010085] [Citation(s) in RCA: 54] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/11/2018] [Revised: 12/28/2018] [Accepted: 12/31/2018] [Indexed: 12/29/2022]
Abstract
This review summaries the optical properties, recent progress in synthesis, and a range of applications of luminescent Cu-based ternary or quaternary quantum dots (QDs). We first present the unique optical properties of the Cu-based multicomponent QDs, regarding their emission mechanism, high photoluminescent quantum yields (PLQYs), size-dependent bandgap, composition-dependent bandgap, broad emission range, large Stokes’ shift, and long photoluminescent (PL) lifetimes. Huge progress has taken place in this area over the past years, via detailed experimenting and modelling, giving a much more complete understanding of these nanomaterials and enabling the means to control and therefore take full advantage of their important properties. We then fully explore the techniques to prepare the various types of Cu-based ternary or quaternary QDs (including anisotropic nanocrystals (NCs), polytypic NCs, and spherical, nanorod and tetrapod core/shell heterostructures) are introduced in subsequent sections. To date, various strategies have been employed to understand and control the QDs distinct and new morphologies, with the recent development of Cu-based nanorod and tetrapod structure synthesis highlighted. Next, we summarize a series of applications of these luminescent Cu-based anisotropic and core/shell heterostructures, covering luminescent solar concentrators (LSCs), bioimaging and light emitting diodes (LEDs). Finally, we provide perspectives on the overall current status, challenges, and future directions in this field. The confluence of advances in the synthesis, properties, and applications of these Cu-based QDs presents an important opportunity to a wide-range of fields and this piece gives the reader the knowledge to grasp these exciting developments.
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Affiliation(s)
- Xue Bai
- School of Chemistry and CRANN Institute, Trinity College Dublin, Dublin 2, Dublin, Ireland.
| | - Finn Purcell-Milton
- School of Chemistry and CRANN Institute, Trinity College Dublin, Dublin 2, Dublin, Ireland.
| | - Yuri K Gun'ko
- School of Chemistry and CRANN Institute, Trinity College Dublin, Dublin 2, Dublin, Ireland.
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Chen EY, Milleville C, Zide JM, Doty MF, Zhang J. Upconversion of low-energy photons in semiconductor nanostructures for solar energy harvesting. ACTA ACUST UNITED AC 2018. [DOI: 10.1557/mre.2018.15] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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27
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Sugawa M, Masaike T, Mikami N, Yamaguchi S, Shibata K, Saito K, Fujii F, Toyoshima YY, Nishizaka T, Yajima J. Circular orientation fluorescence emitter imaging (COFEI) of rotational motion of motor proteins. Biochem Biophys Res Commun 2018; 504:709-714. [PMID: 30213631 DOI: 10.1016/j.bbrc.2018.08.178] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2018] [Accepted: 08/28/2018] [Indexed: 10/28/2022]
Abstract
Single-molecule fluorescence polarization technique has been utilized to detect structural changes in biomolecules and intermolecular interactions. Here we developed a single-molecule fluorescence polarization measurement system, named circular orientation fluorescence emitter imaging (COFEI), in which a ring pattern of an acquired fluorescent image (COFEI image) represents an orientation of a polarization and a polarization factor. Rotation and pattern change of the COFEI image allow us to find changes in the polarization by eye and further values of the parameters of a polarization are determined by simple image analysis with high accuracy. We validated its potential applications of COFEI by three assays: 1) Detection of stepwise rotation of F1-ATPase via single quantum nanorod attached to the rotary shaft γ; 2) Visualization of binding of fluorescent ATP analog to the catalytic subunit in F1-ATPase; and 3) Association and dissociation of one head of dimeric kinesin-1 on the microtubule during its processive movement through single bifunctional fluorescent probes attached to the head. These results indicate that the COFEI provides us the advantages of the user-friendly measurement system and persuasive data presentations.
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Affiliation(s)
- Mitsuhiro Sugawa
- Graduate School of Arts & Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo, 153-8902, Japan
| | - Tomoko Masaike
- Department of Applied Biological Science, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda City, Chiba, 278-8510, Japan
| | - Nagisa Mikami
- Department of Physics, Faculty of Science, Gakushuin University, 1-5-1 Mejiro, Toshima-ku, Tokyo, 171-8588, Japan
| | - Shin Yamaguchi
- Graduate School of Arts & Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo, 153-8902, Japan
| | - Keitaro Shibata
- Graduate School of Arts & Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo, 153-8902, Japan
| | - Kei Saito
- Graduate School of Arts & Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo, 153-8902, Japan
| | - Fumihiko Fujii
- Immunology Frontier Research Center, Osaka University, 3-1 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Yoko Y Toyoshima
- Graduate School of Arts & Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo, 153-8902, Japan
| | - Takayuki Nishizaka
- Department of Physics, Faculty of Science, Gakushuin University, 1-5-1 Mejiro, Toshima-ku, Tokyo, 171-8588, Japan
| | - Junichiro Yajima
- Graduate School of Arts & Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo, 153-8902, Japan.
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Banski M, Chrzanowski M, Zatryb G, Misiewicz J, Podhorodecki A. Enhanced photoluminescence stability of CdS nanocrystals through a zinc acetate reagent. RSC Adv 2018; 8:25417-25422. [PMID: 35539763 PMCID: PMC9082552 DOI: 10.1039/c8ra03504k] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2018] [Accepted: 06/16/2018] [Indexed: 11/21/2022] Open
Abstract
In this study, the role of a zinc acetate precursor in improving the luminescence stability of purple-emitting CdS nanocrystals is investigated. The oleate-capped core of CdS nanocrystals exhibits intense photodarkening under prolonged UV excitation. From the results of photoluminescence experiments, we can observe that photobleaching is responsible for the degradation of temporal stability, i.e., decline in photoluminescence intensity. Herein, we demonstrate that by adding zinc acetate to the synthesis solution, one can enhance the photoluminescence stability by the complete suppression of the bleaching processes of nanocrystals. We can distinguish between the effects caused by zinc ions and those caused by acetate ligands. Acetate ligands improve the photoluminescence stability of the core of CdS nanocrystals. However, only when zinc acetate is used, the PL stability can be conserved at high excitation power. Simultaneously, we have studied the influence of zinc cations and acetate ligands on the kinetics of nanocrystal growth. The presented results underline the importance of short surface capping ligands and zinc cations in CdS nanocrystal synthesis. This study exhibits a new advantage of exploiting zinc acetate reagents in one-pot nanocrystal synthesis.
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Affiliation(s)
- M Banski
- Department of Experimental Physics, Wroclaw University of Science and Technology Wybrzeze Wyspianskiego 27 50-370 Wroclaw Poland
| | - M Chrzanowski
- Department of Experimental Physics, Wroclaw University of Science and Technology Wybrzeze Wyspianskiego 27 50-370 Wroclaw Poland
| | - G Zatryb
- Department of Experimental Physics, Wroclaw University of Science and Technology Wybrzeze Wyspianskiego 27 50-370 Wroclaw Poland
| | - J Misiewicz
- Department of Experimental Physics, Wroclaw University of Science and Technology Wybrzeze Wyspianskiego 27 50-370 Wroclaw Poland
| | - A Podhorodecki
- Department of Experimental Physics, Wroclaw University of Science and Technology Wybrzeze Wyspianskiego 27 50-370 Wroclaw Poland
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Di Maria F, Lodola F, Zucchetti E, Benfenati F, Lanzani G. The evolution of artificial light actuators in living systems: from planar to nanostructured interfaces. Chem Soc Rev 2018; 47:4757-4780. [PMID: 29663003 DOI: 10.1039/c7cs00860k] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Artificially enhancing light sensitivity in living cells allows control of neuronal paths or vital functions avoiding the wiring associated with the use of stimulation electrodes. Many possible strategies can be adopted for reaching this goal, including the direct photoexcitation of biological matter, the genetic modification of cells or the use of opto-bio interfaces. In this review we describe different light actuators based on both inorganic and organic semiconductors, from planar abiotic/biotic interfaces to nanoparticles, that allow transduction of a light signal into a signal which in turn affects the biological activity of the hosting system. In particular, we will focus on the application of thiophene-based materials which, thanks to their unique chemical-physical properties, geometrical adaptability, great biocompatibility and stability, have allowed the development of a new generation of fully organic light actuators for in vivo applications.
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Yao J, Li P, Li L, Yang M. Biochemistry and biomedicine of quantum dots: from biodetection to bioimaging, drug discovery, diagnostics, and therapy. Acta Biomater 2018; 74:36-55. [PMID: 29734008 DOI: 10.1016/j.actbio.2018.05.004] [Citation(s) in RCA: 55] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2017] [Revised: 03/19/2018] [Accepted: 05/02/2018] [Indexed: 12/30/2022]
Abstract
According to recent research, nanotechnology based on quantum dots (QDs) has been widely applied in the field of bioimaging, drug delivery, and drug analysis. Therefore, it has become one of the major forces driving basic and applied research. The application of nanotechnology in bioimaging has been of concern. Through in vitro labeling, it was found that luminescent QDs possess many properties such as narrow emission, broad UV excitation, bright fluorescence, and high photostability. The QDs also show great potential in whole-body imaging. The QDs can be combined with biomolecules, and hence, they can be used for targeted drug delivery and diagnosis. The characteristics of QDs make them useful for application in pharmacy and pharmacology. This review focuses on various applications of QDs, especially in imaging, drug delivery, pharmaceutical analysis, photothermal therapy, biochips, and targeted surgery. Finally, conclusions are made by providing some critical challenges and a perspective of how this field can be expected to develop in the future. STATEMENT OF SIGNIFICANCE Quantum dots (QDs) is an emerging field of interdisciplinary subject that involves physics, chemistry, materialogy, biology, medicine, and so on. In addition, nanotechnology based on QDs has been applied in depth in biochemistry and biomedicine. Some forward-looking fields emphatically reflected in some extremely vital areas that possess inspiring potential applicable prospects, such as immunoassay, DNA analysis, biological monitoring, drug discovery, in vitro labelling, in vivo imaging, and tumor target are closely connected to human life and health and has been the top and forefront in science and technology to date. Furthermore, this review has not only involved the traditional biochemical detection but also particularly emphasized its potential applications in life science and biomedicine.
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Demortière A, Leonard DN, Petkov V, Chapman K, Chattopadhyay S, She C, Cullen DA, Shibata T, Pelton M, Shevchenko EV. Strain-Driven Stacking Faults in CdSe/CdS Core/Shell Nanorods. J Phys Chem Lett 2018; 9:1900-1906. [PMID: 29589949 DOI: 10.1021/acs.jpclett.8b00914] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Colloidal semiconductor nanocrystals are commonly grown with a shell of a second semiconductor material to obtain desired physical properties, such as increased photoluminescence quantum yield. However, the growth of a lattice-mismatched shell results in strain within the nanocrystal, and this strain has the potential to produce crystalline defects. Here, we study CdSe/CdS core/shell nanorods as a model system to investigate the influence of core size and shape on the formation of stacking faults in the nanocrystal. Using a combination of high-angle annular dark-field scanning transmission electron microscopy and pair-distribution-function analysis of synchrotron X-ray scattering, we show that growth of the CdS shell on smaller, spherical CdSe cores results in relatively small strain and few stacking faults. By contrast, growth of the shell on larger, prolate spheroidal cores leads to significant strain in the CdS lattice, resulting in a high density of stacking faults.
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Affiliation(s)
- Arnaud Demortière
- Center for Nanoscale Materials , Argonne National Laboratory , 9700 South Cass Avenue , Argonne , Illinois 60439 , United States
- Laboratoire de Réactivité et Chimie des Solides (LRCS), CNRS UMR 7314 , Université Picardie Jules Verne , 80039 Amiens , France
- Réseau sur le Stockage Electrochimique de l'Energie (RS2E), CNRS FR 3459 , 80039 Amiens , France
| | - Donovan N Leonard
- Materials Science and Technology Division , Oak Ridge National Laboratory , 1 Bethel Valley Road , Oak Ridge , Tennessee 37831-6071 , United States
| | - Valeri Petkov
- Department of Physics , Central Michigan University , Mount Pleasant , Michigan 48859 , United States
| | - Karena Chapman
- Advanced Photon Source , Argonne National Laboratory , 9700 South Cass Avenue , Argonne , Illinois 60439 , United States
| | - Soma Chattopadhyay
- Advanced Photon Source , Argonne National Laboratory , 9700 South Cass Avenue , Argonne , Illinois 60439 , United States
| | - Chunxing She
- Center for Nanoscale Materials , Argonne National Laboratory , 9700 South Cass Avenue , Argonne , Illinois 60439 , United States
| | - David A Cullen
- Materials Science and Technology Division , Oak Ridge National Laboratory , 1 Bethel Valley Road , Oak Ridge , Tennessee 37831-6071 , United States
| | - Tomohiro Shibata
- Advanced Photon Source , Argonne National Laboratory , 9700 South Cass Avenue , Argonne , Illinois 60439 , United States
| | - Matthew Pelton
- Center for Nanoscale Materials , Argonne National Laboratory , 9700 South Cass Avenue , Argonne , Illinois 60439 , United States
- Department of Physics , University of Maryland, Baltimore County (UMBC) , Baltimore , Maryland 21250 , United States
| | - Elena V Shevchenko
- Center for Nanoscale Materials , Argonne National Laboratory , 9700 South Cass Avenue , Argonne , Illinois 60439 , United States
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32
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Paderick S, Kessler M, Hurlburt TJ, Hughes SM. Synthesis and characterization of AgGaS2 nanoparticles: a study of growth and fluorescence. Chem Commun (Camb) 2018; 54:62-65. [PMID: 29206251 DOI: 10.1039/c7cc08070k] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Silver gallium sulfide nanocrystals demonstrate tunability for trap-state emission (650 nm) or band gap fluorescence (460 nm).
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33
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Kostopoulou A, Sygletou M, Brintakis K, Lappas A, Stratakis E. Low-temperature benchtop-synthesis of all-inorganic perovskite nanowires. NANOSCALE 2017; 9:18202-18207. [PMID: 29159334 DOI: 10.1039/c7nr06404g] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
A facile, low-temperature precipitation-based method is utilized for the synthesis of ultra-thin and highly uniform cesium lead bromide perovskite nanowires (NWs). The reactions facilitate the NWs' crystalline nature over micron-size lengths, while they impart tailored nanowire widths that range from the quantum confinement regime (∼7 nm) down to 2.6 nm. This colloidal synthesis approach is the first of its kind that is carried out on the work-bench, without demanding chemical synthesis equipment. Importantly, the NWs' photoluminescence is shown to improve over time, with no requirement for tedious post-synthesis surface treatment.
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Affiliation(s)
- A Kostopoulou
- Institute of Electronic Structure and Laser, Foundation for Research and Technology - Hellas, Vassilika Vouton, Heraklion, 71110, Crete, Greece.
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34
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Parani S, Pandian K, Oluwafemi OS. Gelatin stabilization of quantum dots for improved stability and biocompatibility. Int J Biol Macromol 2017; 107:635-641. [PMID: 28919525 DOI: 10.1016/j.ijbiomac.2017.09.039] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2017] [Revised: 09/11/2017] [Accepted: 09/13/2017] [Indexed: 01/16/2023]
Abstract
We herein report an aqueous synthesis of gelatin stabilized CdTe/CdS/ZnS (CSSG) core/double shell quantum dots (QDs) with improved biocompatibility. The as-synthesized QDs were characterized by ultraviolet-visible (UV-vis) and photoluminescence (PL) spectroscopic techniques, x-ray diffraction technique (XRD), x-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM). The CSSG QDs revealed high photoluminescence quantum yield (PLQY) with excellent stability over a period of one year and retained 90% of its initial PLQY without any aggregation or precipitation under ambient condition. The cell viability study conducted on HeLa, cervical cancer cell lines indicated that the gelatin stabilization effectively decreased the QDs cytotoxicity by about 50%. The CSSG QDs were conjugated with transferrin (Tf) for the efficient delivery to the cancer cells followed by fluorescence imaging. The results showed that the CSSG QDs illuminates the entire cell which renders the QDs as cell labeling markers. The gelatin stabilized core/double shell QDs are potential candidates for long time fluorescent bio-imaging.
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Affiliation(s)
- Sundararajan Parani
- Department of Applied Chemistry, University of Johannesburg, P.O. Box 17011, Doornfontein, Johannesburg 2028, South Africa; Centre for Nanomaterials Science Research, University of Johannesburg, Johannesburg, P.O. Box 17011, Doornfontein, Johannesburg 2028, South Africa
| | - Kannaiyan Pandian
- Department of Inorganic Chemistry, University of Madras, Maraimalai (Guindy) Campus, Chennai, 600025, India
| | - Oluwatobi Samuel Oluwafemi
- Department of Applied Chemistry, University of Johannesburg, P.O. Box 17011, Doornfontein, Johannesburg 2028, South Africa; Centre for Nanomaterials Science Research, University of Johannesburg, Johannesburg, P.O. Box 17011, Doornfontein, Johannesburg 2028, South Africa.
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35
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Zhang L, Jean SR, Ahmed S, Aldridge PM, Li X, Fan F, Sargent EH, Kelley SO. Multifunctional quantum dot DNA hydrogels. Nat Commun 2017; 8:381. [PMID: 28851869 PMCID: PMC5575008 DOI: 10.1038/s41467-017-00298-w] [Citation(s) in RCA: 89] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2017] [Accepted: 06/19/2017] [Indexed: 02/02/2023] Open
Abstract
Biotemplated nanomaterials offer versatile functionality for multimodal imaging, biosensing, and drug delivery. There remains an unmet need for traceable and biocompatible nanomaterials that can be synthesized in a precisely controllable manner. Here, we report self-assembled quantum dot DNA hydrogels that exhibit both size and spectral tunability. We successfully incorporate DNA-templated quantum dots with high quantum yield, long-term photostability, and low cytotoxicity into a hydrogel network in a single step. By leveraging DNA-guided interactions, we introduce multifunctionality for a variety of applications, including enzyme-responsive drug delivery and cell-specific targeting. We report that quantum dot DNA hydrogels can be used for delivery of doxorubicin, an anticancer drug, to increase potency 9-fold against cancer cells. This approach also demonstrated high biocompatibility, trackability, and in vivo therapeutic efficacy in mice bearing xenografted breast cancer tumors. This work paves the way for the development of new tunable biotemplated nanomaterials with multiple synergistic functionalities for biomedical applications. The development of nanomaterials for imaging and drug delivery has been of great interest to the field. Here, the authors synthesized multifunctional enzyme-responsive hydrogels with self-assembling quantum dots for nucleic acid and drug delivery as well as having imaging capability.
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Affiliation(s)
- Libing Zhang
- Department of Pharmaceutical Sciences, Leslie Dan Faculty of Pharmacy, University of Toronto, Toronto, Ontario, Canada, M5S 3M2
| | - Sae Rin Jean
- Department of Chemistry, Faculty of Arts and Science, University of Toronto, Toronto, Ontario, Canada, M5S 3H6
| | - Sharif Ahmed
- Department of Pharmaceutical Sciences, Leslie Dan Faculty of Pharmacy, University of Toronto, Toronto, Ontario, Canada, M5S 3M2
| | - Peter M Aldridge
- Institute for Biomaterials and Biomedical Engineering, University of Toronto, Toronto, Ontario, Canada, M5S 3G9
| | - Xiyan Li
- Department of Electrical and Computer Engineering, Faculty of Engineering, University of Toronto, Toronto, Ontario, Canada, M5S 3G4
| | - Fengjia Fan
- Department of Electrical and Computer Engineering, Faculty of Engineering, University of Toronto, Toronto, Ontario, Canada, M5S 3G4
| | - Edward H Sargent
- Department of Electrical and Computer Engineering, Faculty of Engineering, University of Toronto, Toronto, Ontario, Canada, M5S 3G4.
| | - Shana O Kelley
- Department of Pharmaceutical Sciences, Leslie Dan Faculty of Pharmacy, University of Toronto, Toronto, Ontario, Canada, M5S 3M2. .,Department of Chemistry, Faculty of Arts and Science, University of Toronto, Toronto, Ontario, Canada, M5S 3H6. .,Institute for Biomaterials and Biomedical Engineering, University of Toronto, Toronto, Ontario, Canada, M5S 3G9. .,Department of Biochemistry, Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada, M5S 1A8.
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Hadar I, Philbin JP, Panfil YE, Neyshtadt S, Lieberman I, Eshet H, Lazar S, Rabani E, Banin U. Semiconductor Seeded Nanorods with Graded Composition Exhibiting High Quantum-Yield, High Polarization, and Minimal Blinking. NANO LETTERS 2017; 17:2524-2531. [PMID: 28221804 DOI: 10.1021/acs.nanolett.7b00254] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Seeded semiconductor nanorods represent a unique family of quantum confined materials that manifest characteristics of mixed dimensionality. They show polarized emission with high quantum yield and fluorescence switching under an electric field, features that are desirable for use in display technologies and other optical applications. So far, their robust synthesis has been limited mainly to CdSe/CdS heterostructures, thereby constraining the spectral tunability to the red region of the visible spectrum. Herein we present a novel synthesis of CdSe/Cd1-xZnxS seeded nanorods with a radially graded composition that show bright and highly polarized green emission with minimal intermittency, as confirmed by ensemble and single nanorods optical measurements. Atomistic pseudopotential simulations elucidate the importance of the Zn atoms within the nanorod structure, in particular the effect of the graded composition. Thus, the controlled addition of Zn influences and improves the nanorods' optoelectronic performance by providing an additional handle to manipulate the degree confinement beyond the common size control approach. These nanorods may be utilized in applications that require the generation of a full, rich spectrum such as energy-efficient displays and lighting.
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Affiliation(s)
- Ido Hadar
- The Institute of Chemistry and Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem , Jerusalem 91904, Israel
| | - John P Philbin
- Department of Chemistry, University of California and Lawrence Berkeley National Laboratory , Berkeley, California 94720-1460, United States
| | - Yossef E Panfil
- The Institute of Chemistry and Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem , Jerusalem 91904, Israel
| | - Shany Neyshtadt
- Qlight Nanotech Ltd. (Merck KGaA), Edmond J. Safra Campus, Danciger Building A, POB: 39082, 9139002 Jerusalem, Israel
| | - Itai Lieberman
- Merck KGaA , Performance Materials, Advanced Technologies, OLED & Quantum Materials, Frankfurter Straße 250, 64293 Darmstadt, Germany
| | - Hagai Eshet
- The Sackler Institute for Computational Molecular and Materials Science, Tel Aviv University , Tel Aviv, Israel 69978
- School of Chemistry, Tel Aviv University , Tel Aviv, Israel 69978
| | - Sorin Lazar
- FEI Company, Achtseweg Noord 5, 5651 GG Eindhoven, The Netherlands
| | - Eran Rabani
- Department of Chemistry, University of California and Lawrence Berkeley National Laboratory , Berkeley, California 94720-1460, United States
- The Sackler Institute for Computational Molecular and Materials Science, Tel Aviv University , Tel Aviv, Israel 69978
| | - Uri Banin
- The Institute of Chemistry and Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem , Jerusalem 91904, Israel
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37
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Albrecht W, Goris B, Bals S, Hutter EM, Vanmaekelbergh D, van Huis MA, van Blaaderen A. Morphological and chemical transformations of single silica-coated CdSe/CdS nanorods upon fs-laser excitation. NANOSCALE 2017; 9:4810-4818. [PMID: 28352861 DOI: 10.1039/c6nr09879g] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Radiation-induced modifications of nanostructures are of fundamental interest and constitute a viable out-of-equilibrium approach to the development of novel nanomaterials. Herein, we investigated the structural transformation of silica-coated CdSe/CdS nanorods (NRs) under femtosecond (fs) illumination. By comparing the same nanorods before and after illumination with different fluences we found that the silica-shell did not only enhance the stability of the NRs but that the confinement of the NRs also led to novel morphological and chemical transformations. Whereas uncoated CdSe/CdS nanorods were found to sublimate under such excitations the silica-coated nanorods broke into fragments which deformed towards a more spherical shape. Furthermore, CdS decomposed which led to the formation of metallic Cd, confirmed by high-resolution electron microscopy and energy dispersive X-ray spectrometry (EDX), whereby an epitaxial interface with the remaining CdS lattice was formed. Under electron beam exposure similar transformations were found to take place which we followed in situ.
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Affiliation(s)
- Wiebke Albrecht
- Debye Institute for Nanomaterials Science, Utrecht University, Princetonplein 5, 3584 CC Utrecht, The Netherlands.
| | - Bart Goris
- Electron Microscopy for Materials Science (EMAT), University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium
| | - Sara Bals
- Electron Microscopy for Materials Science (EMAT), University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium
| | - Eline M Hutter
- Debye Institute for Nanomaterials Science, Utrecht University, Princetonplein 5, 3584 CC Utrecht, The Netherlands.
| | - Daniel Vanmaekelbergh
- Debye Institute for Nanomaterials Science, Utrecht University, Princetonplein 5, 3584 CC Utrecht, The Netherlands.
| | - Marijn A van Huis
- Debye Institute for Nanomaterials Science, Utrecht University, Princetonplein 5, 3584 CC Utrecht, The Netherlands.
| | - Alfons van Blaaderen
- Debye Institute for Nanomaterials Science, Utrecht University, Princetonplein 5, 3584 CC Utrecht, The Netherlands.
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38
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Spirin MG, Brichkin SB, Razumov VF. Phosphonic acids as stabilizing ligands for cadmium chalcogenide colloidal quantum dots. Russ Chem Bull 2017. [DOI: 10.1007/s11172-016-1531-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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39
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Balan AD, Eshet H, Olshansky JH, Lee YV, Rabani E, Alivisatos AP. Effect of Thermal Fluctuations on the Radiative Rate in Core/Shell Quantum Dots. NANO LETTERS 2017; 17:1629-1636. [PMID: 28183177 DOI: 10.1021/acs.nanolett.6b04816] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The effect of lattice fluctuations and electronic excitations on the radiative rate is demonstrated in CdSe/CdS core/shell spherical quantum dots (QDs). Using a combination of time-resolved photoluminescence spectroscopy and atomistic simulations, we show that lattice fluctuations can change the radiative rate over the temperature range from 78 to 300 K. We posit that the presence of the core/shell interface plays a significant role in dictating this behavior. We show that the other major factor that underpins the change in radiative rate with temperature is the presence of higher energy states corresponding to electron excitation into the shell. These effects should be present in other core/shell samples and should also affect other excited state rates, such as the rate of Auger recombination or the rate of charge transfer.
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Affiliation(s)
- Arunima D Balan
- Department of Chemistry, University of California, Berkeley , Berkeley, California 94720, United States
- Materials Sciences Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States
- Kavli Energy NanoScience Institute , Berkeley, California 94720, United States
| | | | - Jacob H Olshansky
- Department of Chemistry, University of California, Berkeley , Berkeley, California 94720, United States
- Materials Sciences Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States
- Kavli Energy NanoScience Institute , Berkeley, California 94720, United States
| | - Youjin V Lee
- Department of Chemistry, University of California, Berkeley , Berkeley, California 94720, United States
| | - Eran Rabani
- Department of Chemistry, University of California, Berkeley , Berkeley, California 94720, United States
- Materials Sciences Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States
| | - A Paul Alivisatos
- Department of Chemistry, University of California, Berkeley , Berkeley, California 94720, United States
- Materials Sciences Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States
- Kavli Energy NanoScience Institute , Berkeley, California 94720, United States
- Department of Materials Science and Engineering, University of California , Berkeley, California 94720, United States
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40
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CdS nanocapsules and nanospheres as efficient solar light-driven photocatalysts for degradation of Congo red dye. INORG CHEM COMMUN 2016. [DOI: 10.1016/j.inoche.2016.08.001] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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41
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Ang H, Bosman M, Thamankar R, Zulkifli MFB, Yen SK, Hariharan A, Sudhaharan T, Selvan ST. Highly Luminescent Heterostructured Copper-Doped Zinc Sulfide Nanocrystals for Application in Cancer Cell Labeling. Chemphyschem 2016; 17:2489-95. [PMID: 27146419 DOI: 10.1002/cphc.201600415] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2016] [Indexed: 01/25/2023]
Abstract
The structural characteristics of the seed-mediated synthesis of heterostructured CuS-ZnS nanocrystals (NCs) and Cu-doped ZnS (ZnS:Cu) NCs synthesized by two different protocols are compared and analyzed. At high Cu dopant concentrations, segregated subclusters of ZnS and CuS are observed. The photoluminescence quantum yield of ZnS:Cu NCs is about 50-80 %; a value much higher than that of ZnS NCs (6 %). Finally, these NCs are coated with a thin silica shell by using (3-mercaptopropyl)triethoxysilane in a reverse microemulsion to make them water soluble. Cytotoxicity experiments show that these silica-coated NCs have greatly reduced toxicity on both cancerous HeLa and noncancerous Chinese hamster ovary cells. The labeling of cancerous HeLa cells is also demonstrated.
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Affiliation(s)
- Huixiang Ang
- Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis, Singapore, 138634, Singapore
| | - Michel Bosman
- Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis, Singapore, 138634, Singapore
| | - Ramesh Thamankar
- Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis, Singapore, 138634, Singapore
| | - Muhammad Faizal B Zulkifli
- Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis, Singapore, 138634, Singapore
| | - Swee Kuan Yen
- Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis, Singapore, 138634, Singapore
| | - Anushya Hariharan
- Neural Stem Cell Group, Institute of Medical Biology, 61 Biopolis Drive, Singapore, 138673, Singapore
| | - Thankiah Sudhaharan
- Neural Stem Cell Group, Institute of Medical Biology, 61 Biopolis Drive, Singapore, 138673, Singapore.
| | - Subramanian Tamil Selvan
- Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis, Singapore, 138634, Singapore.
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Qin J, Wen Z, Li S, Hao J, Chen W, Dong D, Deng J, Wang D, Xu B, Wu D, Wang K, Sun X. 63-2:Distinguished Paper: Large-scale Luminance Enhancement Film with Quantum Rods Aligned in Polymeric Nanofibers for High Efficiency Wide Color Gamut LED Display. ACTA ACUST UNITED AC 2016. [DOI: 10.1002/sdtp.10815] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Jing Qin
- Department of Electrical & Electronic Engineering; South University of Science and Technology of China; 518055 Shenzhen China
| | - Zuoliang Wen
- Department of Electrical & Electronic Engineering; South University of Science and Technology of China; 518055 Shenzhen China
| | - Shang Li
- Department of Electrical & Electronic Engineering; South University of Science and Technology of China; 518055 Shenzhen China
| | - Junjie Hao
- Department of Electrical & Electronic Engineering; South University of Science and Technology of China; 518055 Shenzhen China
| | - Wei Chen
- Department of Electrical & Electronic Engineering; South University of Science and Technology of China; 518055 Shenzhen China
| | - Di Dong
- Department of Electrical & Electronic Engineering; South University of Science and Technology of China; 518055 Shenzhen China
| | - Jian Deng
- Department of Electrical & Electronic Engineering; South University of Science and Technology of China; 518055 Shenzhen China
| | - Dan Wang
- Department of Electrical & Electronic Engineering; South University of Science and Technology of China; 518055 Shenzhen China
| | - Bing Xu
- Department of Electrical & Electronic Engineering; South University of Science and Technology of China; 518055 Shenzhen China
| | - Dan Wu
- School of Electrical and Electronic Engineering; Nanyang Technological University; 639798 Singapore Singapore
| | - Kai Wang
- Department of Electrical & Electronic Engineering; South University of Science and Technology of China; 518055 Shenzhen China
| | - Xiaowei Sun
- Department of Electrical & Electronic Engineering; South University of Science and Technology of China; 518055 Shenzhen China
- School of Electrical and Electronic Engineering; Nanyang Technological University; 639798 Singapore Singapore
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43
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Oh E, Liu R, Nel A, Gemill KB, Bilal M, Cohen Y, Medintz IL. Meta-analysis of cellular toxicity for cadmium-containing quantum dots. NATURE NANOTECHNOLOGY 2016; 11:479-86. [PMID: 26925827 DOI: 10.1038/nnano.2015.338] [Citation(s) in RCA: 281] [Impact Index Per Article: 35.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2014] [Accepted: 12/16/2015] [Indexed: 04/14/2023]
Abstract
Understanding the relationships between the physicochemical properties of engineered nanomaterials and their toxicity is critical for environmental and health risk analysis. However, this task is confounded by material diversity, heterogeneity of published data and limited sampling within individual studies. Here, we present an approach for analysing and extracting pertinent knowledge from published studies focusing on the cellular toxicity of cadmium-containing semiconductor quantum dots. From 307 publications, we obtain 1,741 cell viability-related data samples, each with 24 qualitative and quantitative attributes describing the material properties and experimental conditions. Using random forest regression models to analyse the data, we show that toxicity is closely correlated with quantum dot surface properties (including shell, ligand and surface modifications), diameter, assay type and exposure time. Our approach of integrating quantitative and categorical data provides a roadmap for interrogating the wide-ranging toxicity data in the literature and suggests that meta-analysis can help develop methods for predicting the toxicity of engineered nanomaterials.
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Affiliation(s)
- Eunkeu Oh
- Optical Sciences Division, Code 5611, US Naval Research Laboratory, Washington, Washington DC 20375, USA
- Sotera Defense Solutions, Columbia, Maryland 21046, USA
| | - Rong Liu
- Institute of the Environment and Sustainability, University of California, Los Angeles, California 90095-1496, USA
- Center for Environmental Implications of Nanotechnology, University of California, Los Angeles, California 90095-7227, USA
| | - Andre Nel
- Center for Environmental Implications of Nanotechnology, University of California, Los Angeles, California 90095-7227, USA
- Department of Medicine, Division of NanoMedicine, University of California, Los Angeles, California 90095, USA
| | - Kelly Boeneman Gemill
- Center for Bio/Molecular Science and Engineering, Code 6900, US Naval Research Laboratory, SW Washington, Washington DC 20375, USA
| | - Muhammad Bilal
- Center for Environmental Implications of Nanotechnology, University of California, Los Angeles, California 90095-7227, USA
| | - Yoram Cohen
- Institute of the Environment and Sustainability, University of California, Los Angeles, California 90095-1496, USA
- Center for Environmental Implications of Nanotechnology, University of California, Los Angeles, California 90095-7227, USA
- Department of Chemical and Biomolecular Engineering, University of California, Los Angeles, California 90095-1592, USA
| | - Igor L Medintz
- Center for Bio/Molecular Science and Engineering, Code 6900, US Naval Research Laboratory, SW Washington, Washington DC 20375, USA
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44
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Li J, Cheng F, Huang H, Li L, Zhu JJ. Nanomaterial-based activatable imaging probes: from design to biological applications. Chem Soc Rev 2016. [PMID: 26214317 DOI: 10.1039/c4cs00476k] [Citation(s) in RCA: 124] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Activatable imaging probes as alternatives to "always on" imaging probes have attracted more and more attention due to their improved sensitivity and specificity. They are commonly designed to amplify or boost imaging signals only in response to specific biomolecular recognition or interaction. Thus, the design strategies play a vital role in the fabrication of activatable imaging probes. In this review, we focus on the design mechanisms and biological applications of those nanomaterial-based activatable imaging probes reported in the past five years, benefitting greatly from the good development of nanotechnology. These probes not only include the most studied activatable fluorescence imaging probes, but also cover more activatable MR imaging probes based on nanoparticle contrast agents and activatable photoacoustic imaging probes, providing more bases for clinical translation.
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Affiliation(s)
- Jingjing Li
- School of Medical Imaging, Xuzhou Medical College, Xuzhou 221004, China and Department of Radiology, Affiliated Hospital of Xuzhou Medical College, Xuzhou 221006, China
| | - Fangfang Cheng
- State Key Laboratory of Analytical Chemistry for Life Science, Collaborative Innovation of Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China.
| | - Haiping Huang
- State Key Laboratory of Analytical Chemistry for Life Science, Collaborative Innovation of Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China.
| | - Lingling Li
- State Key Laboratory of Analytical Chemistry for Life Science, Collaborative Innovation of Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China.
| | - Jun-Jie Zhu
- State Key Laboratory of Analytical Chemistry for Life Science, Collaborative Innovation of Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China.
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45
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Spano F, Quarta A, Martelli C, Ottobrini L, Rossi RM, Gigli G, Blasi L. Fibrous scaffolds fabricated by emulsion electrospinning: from hosting capacity to in vivo biocompatibility. NANOSCALE 2016; 8:9293-9303. [PMID: 27088757 DOI: 10.1039/c6nr00782a] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Electrospinning is a versatile method for preparing functional three-dimensional scaffolds. Synthetic and natural polymers have been used to produce micro- and nanofibers that mimic extracellular matrices. Here, we describe the use of emulsion electrospinning to prepare blended fibers capable of hosting aqueous species and releasing them in solution. The existence of an aqueous and a non-aqueous phase allows water-soluble molecules to be introduced without altering the structure and the degradation of the fibers, and means that their release properties under physiological conditions can be controlled. To demonstrate the loading capability and flexibility of the blend, various species were introduced, from magnetic nanoparticles and quantum rods to biological molecules. Cellular studies showed the spontaneous adhesion and alignment of cells along the fibers. Finally, in vivo experiments demonstrated the high biocompatibility and safety of the scaffolds up to 21 days post-implantation.
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Affiliation(s)
- F Spano
- Empa, Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Protection and Physiology, Lerchenfeldstrasse 5, CH-9014 St. Gallen, Switzerland and Center for Biomolecular Nanotechnologies (CBN) @UNILE, Istituto Italiano di Tecnologia (IIT), Via Barsanti, 73010 Arnesano (LE), Lecce, Italy
| | - A Quarta
- Nanotechnology Institute (CNR-NANOTEC), Via Monteroni, 73100, Lecce, Italy.
| | - C Martelli
- Department of Pathophysiology and Transplantation, University of Milan, Milan, Italy
| | - L Ottobrini
- Department of Pathophysiology and Transplantation, University of Milan, Milan, Italy and Institute of Molecular Bioimaging and Physiology (IBFM), National Researches Council (CNR), Segrate, Milan, Italy
| | - R M Rossi
- Empa, Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Protection and Physiology, Lerchenfeldstrasse 5, CH-9014 St. Gallen, Switzerland
| | - G Gigli
- Nanotechnology Institute (CNR-NANOTEC), Via Monteroni, 73100, Lecce, Italy.
| | - L Blasi
- Center for Biomolecular Nanotechnologies (CBN) @UNILE, Istituto Italiano di Tecnologia (IIT), Via Barsanti, 73010 Arnesano (LE), Lecce, Italy and Nanotechnology Institute (CNR-NANOTEC), Via Monteroni, 73100, Lecce, Italy.
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46
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Chu X, Dou X, Liang R, Li M, Kong W, Yang X, Luo J, Yang M, Zhao M. A self-assembly aptasensor based on thick-shell quantum dots for sensing of ochratoxin A. NANOSCALE 2016; 8:4127-4133. [PMID: 26866394 DOI: 10.1039/c5nr08284f] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
A novel self-assembling aptasensor was fabricated by precisely attaching three phosphorothioate-modified capture aptamers onto a single thick-shell quantum dot in a controllable manner for monitoring of ochratoxin A (OTA), a poisonous contaminant widespread in foodstuffs. Herein, CdSe/CdS QDs coated in ten layer CdS shells were synthesized using a continual precursor injection method. Analysis of the prepared CdSe/CdS QDs showed a zinc-blende structure, high photoluminescence quantum yields (>80%), and a photoemission peak with a narrow full-width at half-maximum (about 29 nm), all qualities that render them as a superior choice for optical applications. By adjusting the number of phosphorothioate bases in the anchor domain, the tunable-valency aptasensor was able to self-assemble. In the sensing strategy, the thick-shell quantum dot was provided as an acceptor while OTA itself was used as a donor. In the presence of OTA, the capture aptamers drive the aptasensor function into a measurable signal through a fluorescence resonance energy transfer (FRET) system. The newly developed aptasensor had a detection limit as low as 0.5 ng mL(-1), with a linear concentration in the range of 1 to 30 ng mL(-1), and therefore meets the requirements for rapid, effective, and anti-interference sensors for real-world applications. Moreover, the high quality thick-shell QDs provide an ideal alternative for highly sensitive imaging and intensive illumination in the fields of biotechnology and bioengineering.
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Affiliation(s)
- Xianfeng Chu
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100193, China.
| | - Xiaowen Dou
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100193, China.
| | - Ruizheng Liang
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Menghua Li
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100193, China.
| | - Weijun Kong
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100193, China.
| | - Xihui Yang
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100193, China.
| | - Jiaoyang Luo
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100193, China.
| | - Meihua Yang
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100193, China. and Institute of Hainan Branch of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Wanning 571533, China
| | - Ming Zhao
- School of Pharmacy, Jiangsu University, Zhenjiang 212013, China
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47
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Han M, Jia J, Wang W. Pulsed laser deposition of a Bi2S3/CuInS2/TiO2 cascade structure for high photoelectrochemical performance. RSC Adv 2016. [DOI: 10.1039/c6ra14901d] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
The possible mechanism for the improved performance of QDSSCs with a cascade structure of Bi2S3/CuInS2/TiO2.
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Affiliation(s)
- Minmin Han
- State Key Laboratory of Solid Lubrication
- Lanzhou Institute of Chemical Physics
- Chinese Academy of Sciences
- Lanzhou
- P. R. China
| | - Junhong Jia
- State Key Laboratory of Solid Lubrication
- Lanzhou Institute of Chemical Physics
- Chinese Academy of Sciences
- Lanzhou
- P. R. China
| | - Wenzhen Wang
- State Key Laboratory of Solid Lubrication
- Lanzhou Institute of Chemical Physics
- Chinese Academy of Sciences
- Lanzhou
- P. R. China
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48
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Han Z, Wang M, Chen X, Shen S. CdSe-sensitized branched CdS hierarchical nanostructures for efficient photoelectrochemical solar hydrogen generation. Phys Chem Chem Phys 2016; 18:11460-6. [DOI: 10.1039/c6cp00692b] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
CdSe-sensitized branched CdS hierarchical nanostructures showed an improved photoelectrochemical performance for solar hydrogen generation as a result of the synergy of improved optical absorption and promoted charge separation.
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Affiliation(s)
- Zonghu Han
- International Research Center for Renewable Energy
- State Key Laboratory of Multiphase Flow in Power Engineering
- Xi'an Jiaotong University
- China
| | - Meng Wang
- International Research Center for Renewable Energy
- State Key Laboratory of Multiphase Flow in Power Engineering
- Xi'an Jiaotong University
- China
| | - Xiangyan Chen
- International Research Center for Renewable Energy
- State Key Laboratory of Multiphase Flow in Power Engineering
- Xi'an Jiaotong University
- China
| | - Shaohua Shen
- International Research Center for Renewable Energy
- State Key Laboratory of Multiphase Flow in Power Engineering
- Xi'an Jiaotong University
- China
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49
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MAJEED S, LI D, GAO WY, LAI JP, QI LM, SAQIB M, XU GB. Aqueous Synthesis of Tunable Highly Photoluminescent CdTe Quantum Dots Using Rongalite and Bioimaging Application. CHINESE JOURNAL OF ANALYTICAL CHEMISTRY 2015. [DOI: 10.1016/s1872-2040(15)60887-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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50
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Diroll BT, Turk ME, Gogotsi N, Murray CB, Kikkawa JM. Ultrafast Photoluminescence from the Core and the Shell in CdSe/CdS Dot-in-Rod Heterostructures. Chemphyschem 2015; 17:759-65. [PMID: 26502934 DOI: 10.1002/cphc.201500747] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2015] [Indexed: 11/11/2022]
Abstract
With an ultrafast time-resolved photoluminescence system utilizing a Kerr gate, the time-resolved photoluminescence of core and shell constituents within CdSe/CdS dot-in-rod heterostructures is studied as a function of heterostructure size. Measurements performed at low excitation fluence generating, on average, less than one exciton per nanorod, reveal photoluminescence from direct recombination of carriers in the CdS heterostructure rod with lifetime generally increasing from 0.4 ps to 1.3 ps as the rod length increases. Decay of the CdS rod photoluminescence is accompanied by an increase in emission from the CdSe core on comparable time scales, also trending towards larger values as the rod length increases. The observed kinetics can be explained without invoking a non-radiative trapping mechanism. We also present alloying as a mechanism for enhancing electron confinement and reducing fluorescence lifetime at nanosecond time scales.
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Affiliation(s)
| | - Michael E Turk
- Department of Physics, University of Pennsylvania, Philadelphia, Pennsylvania, 19104, USA
| | - Natalie Gogotsi
- Department of Materials Science and Engineering, University of Pennsylvania, USA
| | - Christopher B Murray
- Department of Chemistry, University of Pennsylvania, USA.,Department of Materials Science and Engineering, University of Pennsylvania, USA
| | - James M Kikkawa
- Department of Physics, University of Pennsylvania, Philadelphia, Pennsylvania, 19104, USA.
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