1
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Drastic photostability improvement of silica particles impregnated with multiple emitting CdSe quantum dots prepared through efficient surface silanization. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.130084] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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2
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Yang W, Fang Q, Zhang L, Yin H, Wu C, Zhang W, Huang W, Ni X. Synthesis and characterization of an innovative molecular imprinted polymers based on CdTe QDs fluorescence sensing for selective detection of sulfadimidine. JOURNAL OF POLYMER RESEARCH 2021. [DOI: 10.1007/s10965-021-02714-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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3
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Lova P, Congiu S, Sparnacci K, Angelini A, Boarino L, Laus M, Di Stasio F, Comoretto D. Core-shell silica-rhodamine B nanosphere for synthetic opals: from fluorescence spectral redistribution to sensing. RSC Adv 2020; 10:14958-14964. [PMID: 35497145 PMCID: PMC9052040 DOI: 10.1039/d0ra02245d] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2020] [Accepted: 04/07/2020] [Indexed: 11/21/2022] Open
Abstract
Photonic crystals are a unique tool to modify the photoluminescence of light-emitting materials. A variety of optical effects have been demonstrated by infiltrating opaline structures with photoactive media. On the other hand, the fabrication of such structures includes complex infiltration steps, that often affect the opal lattice and decrease the efficiency of light emission control. In this work, silica nanospheres were directly functionalized with rhodamine B to create an emitting shell around the dielectric core. Simple tuning of the microsphere preparation conditions allows selecting the appropriate sphere diameter and polydispersity index approaching 5%. These characteristics allow facile self-assembling of the nanospheres into three-dimensional photonic crystals whose peculiar density of photonic states at the band-gap edges induces spectral redistribution of the rhodamine B photoluminescence. The possibility to employ the new stable structure as sensor is also investigated. As a proof of principle, we report the variation of light emission obtained by exposure of the opal to vapor of chlorobenzene.
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Affiliation(s)
- Paola Lova
- Dipartimento di Chimica e Chimica Industriale, Università degli Studi di Genova Via Dodecaneso 31 16132 Genova Italy
| | - Simone Congiu
- Dipartimento di Chimica e Chimica Industriale, Università degli Studi di Genova Via Dodecaneso 31 16132 Genova Italy
| | - Katia Sparnacci
- Dipartimento di Scienze e Innovazione Tecnologica (DISIT), Università del Piemonte Orientale "A. Avogadro", INSTM, UdR Alessandria Viale T. Michel 11 15121 Alessandria Italy
| | - Angelo Angelini
- Quantum Research Labs & Nanofacility Piemonte, Advanced Materials Metrology and Life Science Division, Istituto Nazionale di Ricerca Metrologica (INRiM) Strada delle Cacce 91 Torino IT10135 Italy
| | - Luca Boarino
- Quantum Research Labs & Nanofacility Piemonte, Advanced Materials Metrology and Life Science Division, Istituto Nazionale di Ricerca Metrologica (INRiM) Strada delle Cacce 91 Torino IT10135 Italy
| | - Michele Laus
- Dipartimento di Scienze e Innovazione Tecnologica (DISIT), Università del Piemonte Orientale "A. Avogadro", INSTM, UdR Alessandria Viale T. Michel 11 15121 Alessandria Italy
| | - Francesco Di Stasio
- Dipartimento di Chimica e Chimica Industriale, Università degli Studi di Genova Via Dodecaneso 31 16132 Genova Italy
| | - Davide Comoretto
- Dipartimento di Chimica e Chimica Industriale, Università degli Studi di Genova Via Dodecaneso 31 16132 Genova Italy
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Li C, Hosokawa C, Suzuki M, Taguchi T, Murase N. Preparation and biomedical applications of bright robust silica nanocapsules with multiple incorporated InP/ZnS quantum dots. NEW J CHEM 2018. [DOI: 10.1039/c8nj02465k] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
InP/ZnS quantum dots incorporated in silica capsules are robust and bright, and can image cells clearly.
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Affiliation(s)
- Chunliang Li
- Health Research Institute
- National Institute of Advanced Industrial Science and Technology (AIST)
- Ikeda
- Osaka
- Japan
| | - Chie Hosokawa
- Biomedical Research Institute and Advanced Photonics and Biosensing Open Innovation Laboratory
- National Institute of Advanced Industrial Science and Technology (AIST)
- Osaka
- Japan
| | - Mariko Suzuki
- Health Research Institute
- National Institute of Advanced Industrial Science and Technology (AIST)
- Ikeda
- Osaka
- Japan
| | - Takahisa Taguchi
- Health Research Institute
- National Institute of Advanced Industrial Science and Technology (AIST)
- Ikeda
- Osaka
- Japan
| | - Norio Murase
- Health Research Institute
- National Institute of Advanced Industrial Science and Technology (AIST)
- Ikeda
- Osaka
- Japan
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5
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Aippunny AMK, Shamsudeen SM, Valparambil P, Mathew S, Vishwambharan UN. Freestanding Ag2S/CuS PVA films with improved dielectric properties for organic electronics. J Appl Polym Sci 2016. [DOI: 10.1002/app.43568] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Ann Mary K. Aippunny
- School of Pure and Applied Physics; Mahatma Gandhi University; Kottayam Kerala 686 560 India
- Department of Physics; St. Thomas' College (Autonomous); Thrissur Kerala 680 001 India
| | - Sajna M. Shamsudeen
- School of Pure and Applied Physics; Mahatma Gandhi University; Kottayam Kerala 686 560 India
| | - Prakashan Valparambil
- School of Pure and Applied Physics; Mahatma Gandhi University; Kottayam Kerala 686 560 India
| | - Siby Mathew
- Department of Physics; S.H. College (Autonomous); Thevara Kerala 682 013 India
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6
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Rengers C, Voitekhovich SV, Kittler S, Wolf A, Adam M, Gaponik N, Kaskel S, Eychmüller A. 3D assembly of silica encapsulated semiconductor nanocrystals. NANOSCALE 2015; 7:12713-12721. [PMID: 26154738 DOI: 10.1039/c5nr01880c] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Non-ordered porous networks, so-called aerogels, can be achieved by the 3D assembly of quantum dots (QDs). These materials are well suited for photonic applications, however a certain quenching of the photoluminescence (PL) intensity is observed in these structures. This PL quenching is mainly attributed to the energy transfer mechanisms that result from the close contact of the nanoparticles in the network. Here, we demonstrate the formation of a novel aerogel material with non-quenching PL behaviour by non-classical, reversible gel formation from tetrazole capped silica encapsulated QDs. Monitoring of the gelation/degelation by optical spectroscopy showed that the optical properties of the nanocrystals could be preserved in the 3D network since no spectral shifts and lifetime shortening, which can be attributed to the coupling between QDs, are observed in the gels as compared to the original colloidal solutions. In comparison with other QD-silica monoliths, QDs in our gels are homogeneously distributed with a distinct and controllable distance. In addition we show that the silica shell is porous and allows metal ions to pass through the shell and interact with the QD core causing detectable changes of the emission properties. We further show the applicability of this gelation method to other QD materials which sets the stage for facile preparation of a variety of mixed gel structures.
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7
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Wang J, Shah ZH, Zhang S, Lu R. Silica-based nanocomposites via reverse microemulsions: classifications, preparations, and applications. NANOSCALE 2014; 6:4418-37. [PMID: 24562100 DOI: 10.1039/c3nr06025j] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Silica-based nanocomposites with amorphous silica as the matrix or carrier along with a functional component have been extensively investigated. These nanocomposites combine the advantages of both silica and the functional components, demonstrating great potential for various applications. To synthesize such composites, one of the most frequently used methods is reverse microemulsion due to its convenient control over the size, shape, and structures. The structures of the composites have a decisive significance for their properties and applications. In this review, we tried to categorize the silica-based nanocomposites via reverse microemulsions based on their structures, discussed the syntheses individually for each structure, summarized their applications, and made some perspectives based on the current progress of this field.
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Affiliation(s)
- Jiasheng Wang
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian, China.
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Primera-Pedrozo OM, Ates M, Arslan Z. Silica encapsulation of thiol-stabilized lead selenide (PbSe) quantum dots in aqueous solution. MATERIALS LETTERS 2013; 102-103:116-119. [PMID: 23729944 PMCID: PMC3665949 DOI: 10.1016/j.matlet.2013.03.128] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Silica encapsulation of lead selenide quantum dots (PbSe QDs) in aqueous solution is reported. Thioglycolic acid (TGA) stabilized PbSe QDs were modified with 3-mercaptopropyl trimethoxysilane (MPS) through vigorous stirring in water for 18-24 h in alkaline solution (pH 10.4-10.6). Silica shell was developed by controlled deposition and precipitation of silicates from sodium silicate solution onto MPS modified QDs surfaces. TEM images showed multiple PbSe QDs encapsulated in silica shell. The size of PbSe-SiO2 core-shell nanocrystals was estimated to be 25-30 nm by TEM. Elemental compositions (Pb, Se and Si) were investigated by EDX analysis. The purified colloids of PbSe-SiO2 QDs were stable for months when kept at 4 °C.
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Affiliation(s)
| | - Mehmet Ates
- Jackson State University, Department of Chemistry & Biochemistry, Jackson, MS 39217 USA
| | - Zikri Arslan
- Jackson State University, Department of Chemistry & Biochemistry, Jackson, MS 39217 USA
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9
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Isnaeni, Jin LH, Cho YH. Silica encapsulation of toluene soluble quantum dots with high photostability. J Colloid Interface Sci 2013; 395:45-9. [DOI: 10.1016/j.jcis.2013.01.008] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2012] [Revised: 12/30/2012] [Accepted: 01/04/2013] [Indexed: 11/28/2022]
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Liu N, Yang P. Highly luminescent hybrid SiO2-coated CdTe quantum dots: synthesis and properties. LUMINESCENCE 2013; 28:542-50. [DOI: 10.1002/bio.2491] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2012] [Revised: 12/26/2012] [Accepted: 01/02/2013] [Indexed: 11/07/2022]
Affiliation(s)
- Ning Liu
- School of Material Science and Engineering; University of Jinan; 250022; Jinan; People's Republic of China
| | - Ping Yang
- School of Material Science and Engineering; University of Jinan; 250022; Jinan; People's Republic of China
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11
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Wang X, Li W, Zhao B, Zhang D, Sun K, An X, Zhang Z, Shen Z. Highly fluorescent quantum dot@silica nanoparticles by a novel post-treatment for live cell imaging. RSC Adv 2013. [DOI: 10.1039/c3ra22782k] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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12
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Shan Y, Xu JJ, Chen HY. Enhanced electrochemiluminescence quenching of CdS:Mn nanocrystals by CdTe QDs-doped silica nanoparticles for ultrasensitive detection of thrombin. NANOSCALE 2011; 3:2916-2923. [PMID: 21633752 DOI: 10.1039/c1nr10175g] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
This work reports an aptasensor for ultrasensitive detection of thrombin based on remarkably efficient energy-transfer induced electrochemiluminescence (ECL) quenching from CdS:Mn nanocrystals (NCs) film to CdTe QDs-doped silica nanoparticles (CdTe/SiO(2) NPs). CdTe/SiO(2) NPs were synthesized via the Stöber method and showed black bodies' strong absorption in a wide spectral range without excitonic emission, which made them excellent ECL quenchers. Within the effective distance of energy scavenging, the ECL quenching efficiency was dependent on the number of CdTe QDs doped into the silica NPs. Using ca. 200 CdTe QDs doped silica NPs on average of 40 nm in diameter as ECL quenching labels, attomolar detection of thrombin was successfully realized. The protein detection involves a competition binding event, based on thrombin replacing CdTe/SiO(2) NPs labeled probing DNA which is hybridized with capturing aptamer immobilized on a CdS:Mn NCs film modified glassy carbon electrode surface by specific aptamer-protein affinity interactions. It results in the displacement of ECL quenching labels from CdS:Mn NCs film and concomitant ECL signal recovery. Owing to the high-content CdTe QDs in silica NP, the increment of ECL intensity (ΔI(ECL)) and the concentration of thrombin showed a double logarithmic linear correlation in the range of 5.0 aM∼5.0 fM with a detection limit of 1aM. And, the aptasensor hardly responded to antibody, bovine serum albumin (BSA), haemoglobin (Hb) and lysozyme, showing good detection selectivity for thrombin. This long-distance energy scavenging could have a promising application perspective in the detection of biological recognition events on a molecular level.
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Affiliation(s)
- Yun Shan
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, PR China
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Wang YQ, Zou WS. 3-Aminopropyltriethoxysilane-functionalized manganese doped ZnS quantum dots for room-temperature phosphorescence sensing ultratrace 2,4,6-trinitrotoluene in aqueous solution. Talanta 2011; 85:469-75. [PMID: 21645727 DOI: 10.1016/j.talanta.2011.04.014] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2010] [Revised: 03/30/2011] [Accepted: 04/05/2011] [Indexed: 10/18/2022]
Abstract
New strategies for silica coating of inorganic nanoparticles became a research hotspot for enhancing the mechanical stability of colloidal particles and protecting colloidal particles against oxidation and agglomeration, and so on. In this paper, 3-aminopropyltriethoxysilane (APTES)-functionalized Mn doped (AF MnD) ZnS QDs was prepared to be firsyly through the use of silane coupling agents to form an active layer of silica, then sol-gel reaction of TEOS co-deposited with APTES on the surface of resultant active layer of silica. The emitted long lifetime room-temperature phosphorescence (RTP) of the resultant nanomaterials allows an appropriate delay time so that any fluorescent emission and scattering light can be easily avoided. The APTES anchored on the layer of silica can bind 2,4,6-trinitrotoluene (TNT) species to form TNT anion through acid-base pairing interaction, the TNT anion species may increase the charge-transfer pathways from the nanocrystals to nitroaromatic analytes, therefore further enhance the quenching efficiency of RTP. Moreover, APTES as capped reagents can enlarge the spectral sensitivity and enhance RTP response of nanocrystals to the electron-deficient nitroaromatic and nitrophenol species. Meanwhile, AF MnD ZnS QDs also exhibited a highly selective response toward TNT analyte through significant color change and quenching of (4)T(1) to (6)A(1) transition emission. This AF MnD ZnS QDs based sensor showed a very good linearity in the range of 0.05-1.8μM with detection limit down to 50 nM (quenching percentage of phosphorescence intensity of 8%) and RSD of 3.5% (n=5). The reported QDs-based chemosensors here open up a promising prospect for the sensitive and convenient sensing of TNT explosive.
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Affiliation(s)
- Ya-Qin Wang
- School of Materials and Chemical Engineering, Anhui University of Architecture, 856 South Jinzhai Road, Hefei 230022, PR China
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14
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Yang P, Ando M, Murase N. Highly luminescent SiO2 beads with multiple QDs: Preparation conditions and size distributions. J Colloid Interface Sci 2011; 354:455-60. [DOI: 10.1016/j.jcis.2010.11.018] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2010] [Revised: 11/06/2010] [Accepted: 11/09/2010] [Indexed: 10/18/2022]
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15
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Sagarzazu G, Kobayashi Y, Murase N, Yang P, Tamai N. Auger recombination dynamics in hybrid silica-coated CdTe nanocrystals. Phys Chem Chem Phys 2011; 13:3227-30. [DOI: 10.1039/c0cp01957g] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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16
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Serrano IC, Ma Q, Palomares E. QD-“Onion”-Multicode silica nanospheres with remarkable stability as pH sensors. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c1jm13125g] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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17
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Ma Q, Castelló Serrano I, Palomares E. Multiplexed color encoded silica nanospheres prepared by stepwise encapsulating quantum dot/SiO2 multilayers. Chem Commun (Camb) 2011; 47:7071-3. [DOI: 10.1039/c1cc11070e] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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18
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Pillai PP, Reisewitz S, Schroeder H, Niemeyer CM. Quantum-dot-encoded silica nanospheres for nucleic acid hybridization. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2010; 6:2130-2134. [PMID: 20814925 DOI: 10.1002/smll.201000949] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Affiliation(s)
- Pramod P Pillai
- Fakultät Chemie, Biologisch-Chemische Mikrostrukturtechnik, Technische Universität Dortmund, Otto-Hahn-Str. 6, 44227 Dortmund, Germany
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Blue-emitting small silica particles incorporating ZnSe-based nanocrystals prepared by reverse micelle method. J Biomed Biotechnol 2010; 2007:52971. [PMID: 18350119 PMCID: PMC2266811 DOI: 10.1155/2007/52971] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2007] [Revised: 12/17/2007] [Accepted: 12/24/2007] [Indexed: 11/24/2022] Open
Abstract
ZnSe-based nanocrystals (ca. 4-5 nm in diameter) emitting in blue region (ca. 445 nm) were incorporated in spherical small silica particles (20–40 nm in diameter) by a reverse micelle method. During the preparation, alkaline solution was used to deposit the hydrolyzed alkoxide on the surface of nanocrystals. It was crucially important for this solution to include
Zn2+ ions and surfactant molecules (thioglycolic acid) to preserve the spectral properties of the final silica particles. This is because these substances in the solution prevent the surface of nanocrystals from deterioration by dissolution during processing. The resultant silica particles have an emission efficiency of 16% with maintaining the photoluminescent spectral width and peak wavelength of the initial colloidal solution.
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20
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Ueno S, Fujihara S. Formation of Silica Nanolayers on ZnO Electrodes in Dye-Sensitized Solar Cells. Eur J Inorg Chem 2010. [DOI: 10.1002/ejic.200901205] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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21
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Zhou L, Gao C, Hu X, Xu W. One-pot large-scale synthesis of robust ultrafine silica-hybridized CdTe quantum dots. ACS APPLIED MATERIALS & INTERFACES 2010; 2:1211-9. [PMID: 20423141 DOI: 10.1021/am9009296] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
A facile one-pot strategy for synthesis of silica-hybridized CdTe quantum dots (SiO(2)-h-CdTe QDs) in aqueous solution is presented, and subkilogram scale fluorescent SiO(2)-h-QDs can be readily produced in one batch. This approach also makes the tuning of emission wavelength and absorption bandgap of SiO(2)-h-QDs accessible for the first time. In the case of using MPA as ligand, the emission wavelength and absorption bandgap can be tuned in the range of 546-584 nm (the corresponding diameter of QDs increased from 2.0 to 3.2 nm) and 2.55-2.27 eV, respectively. The content of QDs in the resulting nanohybrids can also be readily adjusted in a wide range of 2-95 wt % by the feed ratio of QDs to silica precursors. The resulting SiO(2)-h-QDs are ultrafine with diameters 8-16 nm, and show excellent optical properties, high stability, low toxicity, and versatile surface functionality compared with the neat QDs. Various functional groups such as amino, epoxy, and hydroxyl can be readily introduced to the surface of SiO(2)-h-QDs by silane-coupling chemistry and surface-initiated polymerization. Our strategy opens up enormous opportunities to make full use of these robust fluorescent nanohybrids in various applications because of their facile availability, cost-effective productivity, and high stability.
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Affiliation(s)
- Li Zhou
- Institute of Polymer Science and Engineering, Hunan University, Changsha 410082, People's Republic of China
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Yang P, Murase N. Size-Tunable Highly Luminescent SiO2Particles Impregnated with Number-Adjusted CdTe Nanocrystals. Chemphyschem 2010; 11:815-21. [DOI: 10.1002/cphc.200900850] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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23
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Silica-coated CdTe Quantum Dots of Unchanged Size with Intense Photoluminescence at Various Wavelengths. ACTA ACUST UNITED AC 2010. [DOI: 10.1016/j.phpro.2010.01.220] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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24
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Zhang Q, Song K, Zhao J, Kong X, Sun Y, Liu X, Zhang Y, Zeng Q, Zhang H. Hexanedioic acid mediated surface–ligand-exchange process for transferring NaYF4:Yb/Er (or Yb/Tm) up-converting nanoparticles from hydrophobic to hydrophilic. J Colloid Interface Sci 2009; 336:171-5. [DOI: 10.1016/j.jcis.2009.04.024] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2009] [Revised: 03/31/2009] [Accepted: 04/01/2009] [Indexed: 10/20/2022]
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25
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Murase N, Yang P. Anomalous photoluminescence in silica-coated semiconductor nanocrystals after heat treatment. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2009; 5:800-803. [PMID: 19199335 DOI: 10.1002/smll.200801302] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Affiliation(s)
- Norio Murase
- Photonics Research Institute, National Institute of Advanced Industrial Science and Technology Midorigaoka, Ikeda-city, Osaka 563-8577, Japan.
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26
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Yang P, Ando M, Murase N. Preparation of SiO2 beads with highly luminescent and magnetic nanocrystals via a modified reverse micelle process. NEW J CHEM 2009. [DOI: 10.1039/b901538h] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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27
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Yang P, Ando M, Murase N. Formation of two types of highly luminescent SiO2beads impregnated with multiple CdTe QDs. NEW J CHEM 2009. [DOI: 10.1039/b809478k] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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28
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Yu WW. Semiconductor quantum dots: synthesis and water-solubilization for biomedical applications. Expert Opin Biol Ther 2008; 8:1571-81. [PMID: 18774924 DOI: 10.1517/14712598.8.10.1571] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
BACKGROUND Quantum dots (QDs) are generally nanosized inorganic particles. They have distinctive size-dependent optical properties due to their very small size (mostly < 10 nm). QDs are regarded as promising new fluorescent materials for biological labeling and imaging because of their superior properties compared with traditional organic molecular dyes. These properties include high quantum efficiency, long-term photostability and very narrow emission but broad absorption spectra. OBJECTIVE/METHODS Recent developments in synthesizing high quality semiconductor QDs (mainly metal-chalcogenide compounds) and forming biocompatible structures for biomedical applications are discussed in this paper. RESULTS/CONCLUSIONS This information may facilitate the research to create new materials/technologies for future clinical applications.
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Affiliation(s)
- William W Yu
- Worcester Polytechnic Institute, Department of Chemistry and Biochemistry, 100 Institute Road, Worcester, MA 01609, USA.
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Zhang B, Gong X, Hao L, Cheng J, Han Y, Chang J. A novel method to enhance quantum yield of silica-coated quantum dots for biodetection. NANOTECHNOLOGY 2008; 19:465604. [PMID: 21836251 DOI: 10.1088/0957-4484/19/46/465604] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
In this paper, based on selecting the appropriate type of quantum dots (QDs), a novel method is developed to enhance the quantum yield (QY) of silica-coated QD nanoparticles (SQDNPs). The effect of varying types of QDs on the QY after silica encapsulation is systematically studied. The results show that QDs with appropriate structure and composition of shells can much better retain the initial QY after silanization. The seven-layered shell/core QDs with QY of 47.8% nearly completely retain the original QY and is the best type among six types of QDs for silica modification. In the aspect of shell composition, the CdS plays an important role for QY retention since the lattice mismatch between CdSe and CdS is lower than that of CdSe and ZnS. After the appropriate type of QDs is chosen for silica coating, the highly fluorescent SQDNPs are chemically modified with amine, thiol and carboxyl groups, and then labeled by antibodies for particle-based immunofluorescence assay. The results indicate that the SQDNPs-antibody bioconjugates are alternative fluorescent probes useful for biodetection.
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Affiliation(s)
- Bingbo Zhang
- Institute of Nanobiotechnology, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, People's Republic of China
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