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Yuan W, Li S, Ma X, Pang C, Wu Y, Wang M, Li B. MOF@Au NPs/aptamer fluorescent probe for the selective and sensitive detection of thiamethoxam. LUMINESCENCE 2023. [PMID: 38104966 DOI: 10.1002/bio.4651] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2023] [Revised: 10/20/2023] [Accepted: 11/23/2023] [Indexed: 12/19/2023]
Abstract
The luminescence performance of fluorescent reagents plays a crucial role in fluorescence analysis. Therefore, in this study, a novel bi-ligand Zn-based metal-organic framework, Au nanoparticle (NP) fluorescent material was synthesized using a hydrothermal method with Zn as the metal source. Simultaneously, a DNA aptamer was introduced as a molecular recognition element to develop a Zn-based MOF@Au NPs/DNA aptamer fluorescent probe for the ultra-trace detection of thiamethoxam residues in agricultural products. The probe captured different concentrations of the target molecule, thiamethoxam, through the DNA aptamer, causing a conformational change in the DNA aptamer and bursting the fluorescence of the probe, therefore establishing a fluorometric method for thiamethoxam detection. This method is highly sensitive due to the excellent luminescence properties of the Zn-based MOF@Au NPs, and the DNA aptamer can specifically recognize thiamethoxam, offering high selectivity. The linear range of the method was 2.5-6000 × 10-11 mol L-1 , with a detection limit of 8.33 × 10-12 mol L-1 . This method was applied to the determination of actual samples, such as bananas, and the spiked recovery rate was found to be in the range 84.05-109.07%. Overall, the proposed probe has high sensitivity, high selectivity, and easy operation for the detection of thiamethoxam residues in actual samples.
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Affiliation(s)
- Weiwei Yuan
- College of Food Science and Technology, and MOE, Key Laboratory of Environment Correlative Dietology, Huazhong Agricultural University, Wuhan, China
- Analysis and Test Center, Chinese Academy of Tropical Agricultural Sciences, Hainan Provincial Key Laboratory of Quality and Safety for Tropical Fruits and Vegetables, Key Laboratory of Quality and Safety Control of Subtropical Fruits and Vegetables, Ministry of Agriculture and Rural Affairs, Haikou, China
- Hainan Institute for Food Control, Key Laboratory of Tropical Fruits and Vegetables Quality and Safety for State Market Regulation, Haikou, China
| | - Shuhuai Li
- Analysis and Test Center, Chinese Academy of Tropical Agricultural Sciences, Hainan Provincial Key Laboratory of Quality and Safety for Tropical Fruits and Vegetables, Key Laboratory of Quality and Safety Control of Subtropical Fruits and Vegetables, Ministry of Agriculture and Rural Affairs, Haikou, China
- Hainan Institute for Food Control, Key Laboratory of Tropical Fruits and Vegetables Quality and Safety for State Market Regulation, Haikou, China
| | - Xionghui Ma
- Analysis and Test Center, Chinese Academy of Tropical Agricultural Sciences, Hainan Provincial Key Laboratory of Quality and Safety for Tropical Fruits and Vegetables, Key Laboratory of Quality and Safety Control of Subtropical Fruits and Vegetables, Ministry of Agriculture and Rural Affairs, Haikou, China
| | - Chaohai Pang
- Analysis and Test Center, Chinese Academy of Tropical Agricultural Sciences, Hainan Provincial Key Laboratory of Quality and Safety for Tropical Fruits and Vegetables, Key Laboratory of Quality and Safety Control of Subtropical Fruits and Vegetables, Ministry of Agriculture and Rural Affairs, Haikou, China
| | - Yuwei Wu
- Analysis and Test Center, Chinese Academy of Tropical Agricultural Sciences, Hainan Provincial Key Laboratory of Quality and Safety for Tropical Fruits and Vegetables, Key Laboratory of Quality and Safety Control of Subtropical Fruits and Vegetables, Ministry of Agriculture and Rural Affairs, Haikou, China
| | - Mingyue Wang
- College of Food Science and Technology, and MOE, Key Laboratory of Environment Correlative Dietology, Huazhong Agricultural University, Wuhan, China
- Analysis and Test Center, Chinese Academy of Tropical Agricultural Sciences, Hainan Provincial Key Laboratory of Quality and Safety for Tropical Fruits and Vegetables, Key Laboratory of Quality and Safety Control of Subtropical Fruits and Vegetables, Ministry of Agriculture and Rural Affairs, Haikou, China
- Hainan Institute for Food Control, Key Laboratory of Tropical Fruits and Vegetables Quality and Safety for State Market Regulation, Haikou, China
| | - Bei Li
- Hainan Institute for Food Control, Key Laboratory of Tropical Fruits and Vegetables Quality and Safety for State Market Regulation, Haikou, China
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Cho J, Jung YK, Lee JK, Jung HS. Surface Coating of Gradient Alloy Quantum Dots with Oxide Layer in White-Light-Emitting Diodes for Display Backlights. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:13040-13050. [PMID: 29061048 DOI: 10.1021/acs.langmuir.7b03335] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Recently, quantum dots (QDs) have been successfully developed as efficient color converters for light-emitting diodes (LEDs) display due to excellent optical properties of QDs. Herein, we demonstrate a new approach to form metal oxide layers (or metal oxide coating) on the exterior surface of gradient alloy QDs (the most advanced chemical architecture QDs developed thus far wherein the lattice parameter from the core to shell is changing in a gradient fashion) in order to improve the photochemical stability and photoluminescence efficiency. The resulting CdO-treated QDs are incorporated into polymer matrix films to fabricate a backlight unit as a part of display panel wherein CdO-treated gradient alloy QDs are utilized as color converters upon the blue-LED excitation. The fabricated 9.7 in. iPad 2 tablet liquid crystal display panel exhibited an excellent uniformity in terms of CIE chromaticity, luminance, and bright variation and superb durability test results (maintenance of ca. 110% brightness compared to initial value even after 3 weeks of operation).
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Affiliation(s)
- Junsang Cho
- Department of Chemistry, Seoul National University , Seoul 151-747, Korea
- Department of Chemistry, Texas A&M University , College Station, Texas 77843, United States
| | - Yun Ku Jung
- Department of Chemistry, Seoul National University , Seoul 151-747, Korea
- Display R&D Center, Samsung Display Co., Ltd. , Yongin 446-711, Korea
| | - Jin-Kyu Lee
- Department of Chemistry, Seoul National University , Seoul 151-747, Korea
| | - Hak-Sung Jung
- Department of Chemistry, Seoul National University , Seoul 151-747, Korea
- Laboratory of Single Molecule Biophysics, National Heart, Lung and Blood Institute, National Institutes of Health , 50 South Drive, Building 50, Bethesda, Maryland 20892, United States
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Fujii M, Sugimoto H, Imakita K. All-inorganic colloidal silicon nanocrystals-surface modification by boron and phosphorus co-doping. NANOTECHNOLOGY 2016; 27:262001. [PMID: 27189818 DOI: 10.1088/0957-4484/27/26/262001] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Si nanocrystals (Si-NCs) with extremely heavily B- and P-doped shells are developed and their structural and optical properties are studied. Unlike conventional Si-NCs without doping, B and P co-doped Si-NCs are dispersible in alcohol and water perfectly without any surface functionalization processes. The colloidal solution of co-doped Si-NCs is very stable and no precipitates are observed for more than 5 years. The co-doped colloidal Si-NCs exhibit size-controllable photoluminescence (PL) in a very wide energy range covering 0.85 to 1.85 eV. In this paper, we summarize the structural and optical properties of co-doped Si-NCs and demonstrate that they are a new type of environmentally-friendly nano-light emitter working in aqueous environments in the visible and near infrared (NIR) ranges.
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Affiliation(s)
- Minoru Fujii
- Department of Electrical and Electronic Engineering, Graduate School of Engineering, Kobe University, Rokkodai, Nada, Kobe 657-8501, Japan
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Sugimoto H, Fujii M, Fukuda Y, Imakita K, Akamatsu K. All-inorganic water-dispersible silicon quantum dots: highly efficient near-infrared luminescence in a wide pH range. NANOSCALE 2014; 6:122-126. [PMID: 24189524 DOI: 10.1039/c3nr03863g] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
We report a novel method to prepare silicon quantum dots (Si-QDs) having excellent stability in water without organic-ligands by simultaneously doping phosphorus and boron. The codoped Si-QDs in water exhibit bright size-tunable luminescence in a biological window. The luminescence of codoped Si-QDs is very stable under continuous photoexcitation in water.
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Affiliation(s)
- Hiroshi Sugimoto
- Department of Electrical and Electronic Engineering, Graduate School of Engineering, Kobe University, Rokkodai, Nada, Kobe 657-8501, Japan.
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A fusion-spliced near-field optical fiber probe using photonic crystal fiber for nanoscale thermometry based on fluorescence-lifetime measurement of quantum dots. SENSORS 2011; 11:8358-69. [PMID: 22164080 PMCID: PMC3231516 DOI: 10.3390/s110908358] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/18/2011] [Revised: 08/22/2011] [Accepted: 08/22/2011] [Indexed: 11/16/2022]
Abstract
We have developed a novel nanoscale temperature-measurement method using fluorescence in the near-field called Fluorescence Near-field Optics Thermal Nanoscopy (Fluor-NOTN). Fluor-NOTN enables the temperature distributions of nanoscale materials to be measured in vivo/in situ. The proposed method measures temperature by detecting the temperature dependent fluorescence lifetimes of Cd/Se Quantum Dots (QDs). For a high-sensitivity temperature measurement, the auto-fluorescence generated from a fiber probe should be reduced. In order to decrease the noise, we have fabricated a novel near-field optical-fiber probe by fusion-splicing a photonic crystal fiber (PCF) and a conventional single-mode fiber (SMF). The validity of the novel fiber probe was assessed experimentally by evaluating the auto-fluorescence spectra of the PCF. Due to the decrease of auto-fluorescence, a six- to ten-fold increase of S/N in the near-field fluorescence lifetime detection was achieved with the newly fabricated fusion-spliced near-field optical fiber probe. Additionally, the near-field fluorescence lifetime of the quantum dots was successfully measured by the fabricated fusion-spliced near-field optical fiber probe at room temperature, and was estimated to be 10.0 ns.
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Durisic N, Godin AG, Walters D, Grütter P, Wiseman PW, Heyes CD. Probing the "dark" fraction of core-shell quantum dots by ensemble and single particle pH-dependent spectroscopy. ACS NANO 2011; 5:9062-73. [PMID: 22023370 PMCID: PMC3259027 DOI: 10.1021/nn203272p] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
The optical properties of core-shell CdSe-ZnS quantum dots (QDs) are characterized by complex photophysics leading to difficulties in interpreting quantitative measurements based on QD emission. By comparing the pH dependence of fluorescence of single QDs to that of an ensemble, we have been able to propose a molecular scale model of how QD surface chemical and physical processes are affected by protons and oxygen. We show that the connection between the ensemble fluorescence intensity and the single QD fluorescence properties such as dark fraction, blinking, particle brightness, and a multiexponential fluorescence lifetime decay is not trivial. The ensemble fluorescence intensity is more weakly dependent on pH than the single particle fluorescence which, together with fluorescence lifetime analysis, provided evidence that the dark fraction of QDs emits photons with low quantum efficiency and long lifetime. We uncovered two surface-dependent mechanisms that affected the fluorescence emission: an immediate physical effect of charges surrounding the QD and an irreversible chemical effect from reaction of the H(+) and O(2) with the QD shell surface. These results will have important implications for those using QD-based fluorescence lifetime imaging as well as for proper implementation of these probes for quantitative cellular imaging applications.
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Affiliation(s)
- Nela Durisic
- Department of Physics, McGill University, 3600 Rue University, Montreal, Quebec, Canada, H3A 2T8
| | - Antoine G. Godin
- Department of Physics, McGill University, 3600 Rue University, Montreal, Quebec, Canada, H3A 2T8
| | - Derrel Walters
- Department of Chemistry and Biochemistry, University of Arkansas, 345 N. Campus Drive, Fayetteville, AR, 72701
| | - Peter Grütter
- Department of Physics, McGill University, 3600 Rue University, Montreal, Quebec, Canada, H3A 2T8
| | - Paul W. Wiseman
- Department of Physics, McGill University, 3600 Rue University, Montreal, Quebec, Canada, H3A 2T8
- Department of Chemistry, McGill University, 800 Rue Sherbrooke Ouest, Montreal, Quebec, Canada, H3A 2K6
| | - Colin D. Heyes
- Department of Chemistry and Biochemistry, University of Arkansas, 345 N. Campus Drive, Fayetteville, AR, 72701
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Chen HS, Chung TH, Lin MC, Lan YW, Chen CD, Lin HY. Voltage controlled photoluminescence blinking in CdSe nano-particles. OPTICS EXPRESS 2010; 18:26872-26878. [PMID: 21196964 DOI: 10.1364/oe.18.026872] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Voltage controlled photoluminescence (PL) blinking behavior in CdSe nano-particles (NPs) is studied. The NPs are sandwiched between a p-type silicon substrate and a thin Au electrode, which serve respectively as source and drain electrodes. The blinking PL from the NPs can be controlled by the bias voltage across the two electrodes. However, luminescence diminishes when photo excitation power is weak or bias is lower than a threshold voltage. The observed PL blinking is explained by a circuit model, which involves charge tunneling, Fowler-Nordheim (F-N) emission, and charging effect. The blinking intensity is controlled by the number of F-N emitted electrons whereas the pulse interval is associated with the time required for hole accumulation in the NPs. The intensity of luminescence blinking for NP clusters is found to be much higher compared to that of blinking from isolated NPs. This is explained by a collective recombination of F-N emitted electrons and accumulated holes in the NP clusters. This study provides a simple way of controlling PL blinking.
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Affiliation(s)
- Horng-Shyang Chen
- Department of Materials Science, National University of Tainan, Tainan, Taiwan, ROC
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Bera D, Qian L, Tseng TK, Holloway PH. Quantum Dots and Their Multimodal Applications: A Review. MATERIALS 2010. [PMCID: PMC5445848 DOI: 10.3390/ma3042260] [Citation(s) in RCA: 417] [Impact Index Per Article: 29.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Semiconducting quantum dots, whose particle sizes are in the nanometer range, have very unusual properties. The quantum dots have band gaps that depend in a complicated fashion upon a number of factors, described in the article. Processing-structure-properties-performance relationships are reviewed for compound semiconducting quantum dots. Various methods for synthesizing these quantum dots are discussed, as well as their resulting properties. Quantum states and confinement of their excitons may shift their optical absorption and emission energies. Such effects are important for tuning their luminescence stimulated by photons (photoluminescence) or electric field (electroluminescence). In this article, decoupling of quantum effects on excitation and emission are described, along with the use of quantum dots as sensitizers in phosphors. In addition, we reviewed the multimodal applications of quantum dots, including in electroluminescence device, solar cell and biological imaging.
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Affiliation(s)
- Debasis Bera
- Authors to whom correspondence should be addressed; E-Mails: (D.B.); (P.H.H.); Tel.: 352-846-3331; Fax: 352-392-4911 202
| | | | | | - Paul H. Holloway
- Authors to whom correspondence should be addressed; E-Mails: (D.B.); (P.H.H.); Tel.: 352-846-3331; Fax: 352-392-4911 202
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Grabolle M, Kapusta P, Nann T, Shu X, Ziegler J, Resch-Genger U. Fluorescence Lifetime Multiplexing with Nanocrystals and Organic Labels. Anal Chem 2009; 81:7807-13. [DOI: 10.1021/ac900934a] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Markus Grabolle
- BAM Federal Institute for Materials Research and Testing, Richard-Willstaetter-Strasse 11, 12489 Berlin, Germany, PicoQuant GmbH, Rudower Chaussee 29, 12489 Berlin, Germany, and School of Chemistry, University of East Anglia (UEA), Norwich NR4 7TJ, U.K
| | - Peter Kapusta
- BAM Federal Institute for Materials Research and Testing, Richard-Willstaetter-Strasse 11, 12489 Berlin, Germany, PicoQuant GmbH, Rudower Chaussee 29, 12489 Berlin, Germany, and School of Chemistry, University of East Anglia (UEA), Norwich NR4 7TJ, U.K
| | - Thomas Nann
- BAM Federal Institute for Materials Research and Testing, Richard-Willstaetter-Strasse 11, 12489 Berlin, Germany, PicoQuant GmbH, Rudower Chaussee 29, 12489 Berlin, Germany, and School of Chemistry, University of East Anglia (UEA), Norwich NR4 7TJ, U.K
| | - Xu Shu
- BAM Federal Institute for Materials Research and Testing, Richard-Willstaetter-Strasse 11, 12489 Berlin, Germany, PicoQuant GmbH, Rudower Chaussee 29, 12489 Berlin, Germany, and School of Chemistry, University of East Anglia (UEA), Norwich NR4 7TJ, U.K
| | - Jan Ziegler
- BAM Federal Institute for Materials Research and Testing, Richard-Willstaetter-Strasse 11, 12489 Berlin, Germany, PicoQuant GmbH, Rudower Chaussee 29, 12489 Berlin, Germany, and School of Chemistry, University of East Anglia (UEA), Norwich NR4 7TJ, U.K
| | - Ute Resch-Genger
- BAM Federal Institute for Materials Research and Testing, Richard-Willstaetter-Strasse 11, 12489 Berlin, Germany, PicoQuant GmbH, Rudower Chaussee 29, 12489 Berlin, Germany, and School of Chemistry, University of East Anglia (UEA), Norwich NR4 7TJ, U.K
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Hezinger AFE, Tessmar J, Göpferich A. Polymer coating of quantum dots – A powerful tool toward diagnostics and sensorics. Eur J Pharm Biopharm 2008; 68:138-52. [PMID: 17689938 DOI: 10.1016/j.ejpb.2007.05.013] [Citation(s) in RCA: 144] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2006] [Revised: 05/14/2007] [Accepted: 05/21/2007] [Indexed: 11/24/2022]
Abstract
The use of quantum dots for biological and biomedical applications is one of the fastest moving fields of nanotechnology today. The unique optical properties of these nanometer-sized semiconductor crystals make them an exciting fluorescent tool for in-vivo and in-vitro imaging as well as for sensoric applications. To apply them in biological fluids or aqueous environment it is essential to modulate the chemical nature of quantum dot surfaces to alter their solubility and add additional chemical functionalities. By employing different coating technologies they cannot only be rendered water soluble but also functionalized to fulfill different tasks, like receptor targeting or sensing of low molecular weight substances. To achieve this goal different polymeric coatings are applied to provide solubility in water and additional functional groups for attachment. Taken together the versatile modifications described in this review make quantum dots a promising alternative to conventional fluorescent dyes and may offer possibilities for new future developments.
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Affiliation(s)
- A F E Hezinger
- Department of Pharmaceutical Technology, Universität Regensburg, Universitätstrasse 31, Regensburg, Germany
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Seydack M. Nanoparticle labels in immunosensing using optical detection methods. Biosens Bioelectron 2004; 20:2454-69. [PMID: 15854819 DOI: 10.1016/j.bios.2004.11.003] [Citation(s) in RCA: 210] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2004] [Revised: 11/04/2004] [Accepted: 11/04/2004] [Indexed: 10/26/2022]
Abstract
Efforts to improve the performance of immunoassays and immunosensors by incorporating different kinds of nanostructures have gained considerable momentum over the last decade. Apart from liposomes, which will not be discussed here, most groups focus on artificial, particulate marker systems, both organic and inorganic. The underlying detection procedures may be based either on electro-magnetical or optical techniques. This review will be confined to the latter only, comprising nanoparticle applications generating signals as diverse as static and time-resolved luminescence, one- and two-photon absorption, Raman and Rayleigh scattering as well as surface plasmon resonance and others. In general, all endeavors cited are geared to achieve one or more of the following goals: lowering of detection limits (if possible, down to single-molecule level), parallel integration of multiple signals (multiplexing), signal amplification by several orders of magnitude and prevention of photobleaching effects with concomitant maintenance of antigen binding specificity and sensitivity. Inorganic nanoparticle labels based on noble metals, semiconductor quantum dots and nanoshells appear to be the most versatile systems for these bioanalytical applications of nanophotonics.
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Affiliation(s)
- Matthias Seydack
- 8sens.biognostic AG, Nanobiotechnology Group, Robert-Roessle-Str. 10, 13125 Berlin, Germany.
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Spectral Imaging of Single CdSe/ZnS Quantum Dots Employing Spectrally- and Time-resolved Confocal Microscopy. ACTA ACUST UNITED AC 2002. [DOI: 10.1007/978-3-642-56067-5_19] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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