Preparation of narrow size distribution CdS quantum dots in sodium borosilicate glass by the sol-gel process

1994 ◽  
Author(s):  
Yu-Hua Kao ◽  
Kazutaka Hayashi ◽  
Ling Yu ◽  
Masayuki Yamane ◽  
John D. Mackenzie
Keyword(s):  
Quantum Dots ◽  
Size Distribution ◽  
Borosilicate Glass ◽  
Sol Gel ◽  
Narrow Size Distribution ◽  
Cds Quantum Dots ◽  
Sodium Borosilicate Glass ◽  
Sol Gel Process

Sol–gel synthesis and optical properties of CuGaS2 quantum dots embedded in sodium borosilicate glass

2014 ◽  
Vol 610 ◽  
pp. 392-398 ◽  
Author(s):  
Jiasong Zhong ◽  
Haijun Zhao ◽  
Chenglong Zhang ◽  
Xin Ma ◽  
Lang Pei ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Borosilicate Glass ◽  
Sol Gel ◽  
Sodium Borosilicate Glass ◽  
Sol Gel Synthesis

Preparation and non-linear optical properties of CdS quantum dots in Na2O-B2O3-SiO2 glasses by the sol-gel technique

1996 ◽  
Vol 31 (2) ◽  
pp. 423-430 ◽  
Author(s):  
T. Takada ◽  
J. D. Mackenzie ◽  
M. Yamane ◽  
K. Kang ◽  
N. Peyghambarian ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Sol Gel ◽  
Cds Quantum Dots ◽  
Non Linear ◽  
Linear Optical Properties ◽  
Gel Technique ◽  
Linear Optical

Stranski-Krastanov Growth of InAs Quantum Dots with Narrow Size Distribution

2000 ◽  
Vol 39 (Part 2, No. 12A) ◽  
pp. L1245-L1248 ◽  
Author(s):  
Koichi Yamaguchi ◽  
Kunihiko Yujobo ◽  
Toshiyuki Kaizu
Keyword(s):  
Quantum Dots ◽  
Size Distribution ◽  
Narrow Size Distribution ◽  
Inas Quantum Dots

scholarly journals Carbon Quantum Dots Encapsulated Molecularly Imprinted Fluorescence Quenching Particles for Sensitive Detection of Zearalenone in Corn Sample

Toxins ◽  
2018 ◽  
Vol 10 (11) ◽  
pp. 438 ◽  
Author(s):  
Manyu Shao ◽  
Ming Yao ◽  
Sarah De Saeger ◽  
Liping Yan ◽  
Suquan Song
Keyword(s):  
Quantum Dots ◽  
Fluorescence Quenching ◽  
Sol Gel ◽  
Carbon Quantum Dots ◽  
Detection Range ◽  
Molecularly Imprinted ◽  
Relative Standard ◽  
Sol Gel Process ◽  
One Step ◽  
Optimized Conditions

An eco-friendly and efficient one-step approach for the synthesis of carbon quantum dots (CDs) that encapsulated molecularly imprinted fluorescence quenching particles (MIFQP) and their application for the determination of zearalenone (ZEA) in a cereal sample are described in this study. CDs with high luminescence were first synthesized, and then encapsulated in the silica-based matrix through a non-hydrolytic sol-gel process. The resulting ZEA-imprinted particles exhibited not only an excellent specific molecular recognition of ZEA, but also good photostability and obvious template binding-induced fluorescence quenching. Under the optimized conditions, the fluorescence intensity of MIFQP was inversely proportional to the concentration of ZEA. By validation, the detection range of these fluorescence quenching materials for ZEA was between 0.02 and 1.0 mg L−1, and the detection limit was 0.02 mg L−1 (S/N = 3). Finally, the MIFQP sensor was successfully applied for ZEA determination in corn with recoveries from 78% to 105% and the relative standard deviation (RSD %) was lower than 20%, which suggests its potential in actual applications.

An Experimental Study on Synthesis and Characterization of Silica Nanoparticles Prepared by Sol-Gel Method

2007 ◽  
Vol 553 ◽  
pp. 245-251
Author(s):  
Ali Shokuhfar ◽  
Tolou Shokuhfar ◽  
M. Ghazinejad ◽  
R. Babazade ◽  
S. Tabatabae
Keyword(s):  
Electron Microscopy ◽  
Silica Nanoparticles ◽  
Size Distribution ◽  
Sol Gel ◽  
Sio2 Nanoparticles ◽  
Industrial Applications ◽  
Silica Particles ◽  
Narrow Size Distribution ◽  
Molar Ratios ◽  
Transmission Electron

Monodispersed nanometer-sized particles proved to be very important and advantageous in many industrial applications. One of the notable groups of these particles is silica (SiO2) nanoparticles which are widely utilized in developing numerous products such as electrical and thermal insulators, humidity sensors, varnish, etc. Since the quality of some of these products depends highly on the purity and size distribution of the silica particles, it is necessary to produce silica nanoparticles of narrow size distribution and very high purity. In this research silica nanoparticles, with a relatively narrow size distribution, have been synthesized via the hydrolysis reaction of tetraethoxisilane (TEOS) in the solution of deionized water and ethanol (C2H5OH), and in the presence of ammonia (NH3) as a catalyst. The nature, morphology and the size of the silica particles has been studied using Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM) and X-ray diffraction. Results indicate that the morphology, structure and the diameter of silica particles depend strongly on the molar ratios of the reactants.

Photoluminescence of ZnO quantum dots produced by a sol–gel process

2008 ◽  
Vol 30 (8) ◽  
pp. 1233-1239 ◽  
Author(s):  
Debasis Bera ◽  
Lei Qian ◽  
Subir Sabui ◽  
Swadeshmukul Santra ◽  
Paul H. Holloway
Keyword(s):  
Quantum Dots ◽  
Sol Gel ◽  
Sol Gel Process ◽  
Zno Quantum Dots

Photoconductivity of PbO-doped borosilicate glass prepared by the sol-gel process

1992 ◽  
Vol 147-148 ◽  
pp. 574-578 ◽  
Author(s):  
W. Granier ◽  
K. Jabobker ◽  
A. Pradel ◽  
M. Pham Thi
Keyword(s):  
Borosilicate Glass ◽  
Sol Gel ◽  
Sol Gel Process

Comparative Studies of Multiferroic BiFeO3 Powders Prepared by Hydrothermal Method versus Sol-Gel Process

2014 ◽  
Vol 670-671 ◽  
pp. 113-116 ◽  
Author(s):  
Xiao Yan Zhang ◽  
Xi Wei Qi ◽  
Zhi Yuan Yang ◽  
Rui Xia Zhong
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Hydrothermal Method ◽  
Sol Gel ◽  
Distribution Analysis ◽  
Sem Images ◽  
Multiferroic Bifeo ◽  
Average Grain Size ◽  
Sol Gel Process

Multiferroic BiFeO3 powders were synthesized by two methods: sol-gel process and hydrothermal method. The synthesized powders were characterized by X-ray diffraction (XRD), field emission scanning electron microscope (SEM) and particle size distribution analysis. The results obtained by XRD, which is consistent with 86-1518 JCPDS card, show that powders prepared by hydrothermal method are composed of the single phase with the trigonal structure (perovskite-type). It can be found by particle size distribution analysis that the particle size of the samples prepared by sol-gel process is finer and more uniform than that of the samples synthesized by the hydrothermal method. The SEM images of samples depicts that the synthesized BiFeO3 powders are united and the average grain size of hydrothermal processed samples is significantly large as compared to the sol-gel derived sample.

Effect of Cores on Photoluminescence of Hybrid SiO2-Coated CdTe Quantum Dots

2020 ◽  
Vol 20 (9) ◽  
pp. 5478-5485
Author(s):  
Cong Xie ◽  
Yubin Zhao ◽  
Yuxiang Song ◽  
Yingjie Liu ◽  
Yaya Wang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
High Stability ◽  
Sol Gel ◽  
Quantum Yields ◽  
Core Shell ◽  
Aqueous Synthesis ◽  
Pl Spectra ◽  
Cdte Qds ◽  
Sol Gel Process ◽  
20 Nm

Compared with conventional semiconductor quantum dots, hybrid SiO2 coated CdTe QDs exhibited high stability, long fluorescent lifetime, high photoluminescence quantum yields, and well biocompatibility. In this paper, CdTe QDs with tunable PL from green to red emitting were prepared by an aqueous synthesis. A sol–gel process resulted in CdTe QDs coated with a hybrid SiO2 shell contained CdS-like clusters to obtain red-shifted PL spectra, increased PL efficiency and high stability. The clusters were formed by the reaction of Cd2+ and S2− ions generated via the decomposition of thioglycolic acid. The clusters around CdTe cores created a core–shell structure which is very similar with traditional semiconductor core–shell QDs. After being coated with a hybrid SiO2 shell, the PL of green-emitting naked CdTe QDs was red-shifted largely (~30 nm) while the PL of yellowemitting CdTe QDs revealed a small red-shifted (~20 nm). Furthermore, The PL of red-emitting naked CdTe QDs was red-shifted much small (less than 10 nm). This phenomenon is ascribed to the change of band gap of CdTe cores with sizes. The red-shift of PL spectra is attributed to the CdS-like clusters around the core rather than the thickness of the hybrid SiO2 shell.

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