Highly Stabilized Gradient Alloy Quantum Dots and Silica Hybrid Nanospheres by Core Double Shells for Photoluminescence Devices

2020 ◽  
Vol 11 (4) ◽  
pp. 1428-1434 ◽  
Author(s):  
Hongxing Xie ◽  
Enguo Chen ◽  
Yun Ye ◽  
Sheng Xu ◽  
Tailiang Guo
Keyword(s):  
Quantum Dots ◽  
Alloy Quantum Dots ◽  
Silica Hybrid

scholarly journals Quaternary Alloy Quantum Dots as Fluorescence Probes for Total Acidity Detection of Paper-Based Relics

Nanomaterials ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1726
Author(s):  
Zhuorui Wang ◽  
Cong Cheng ◽  
Yongjuan Cheng ◽  
Lizhen Zheng ◽  
Daodao Hu
Keyword(s):  
Quantum Dots ◽  
Extraction Method ◽  
Quaternary Alloy ◽  
New Method ◽  
Fluorescence Probes ◽  
Total Acidity ◽  
Weak Acids ◽  
Paper Sample ◽  
Composition And Structure ◽  
Alloy Quantum Dots

Traditionally, the acidity of paper-based relics was determined by an extraction method and using a pH meter. This method could not obtain the total acidity of the paper-based relics because it only detected the concentration of free protons in the aqueous soaking solution. To overcome this defect, a new method for determining the total acidity of paper-based relics has been established by using quaternary alloy quantum dots. The quantum dots, CdZnSeS, modified by p-Aminothiophenol (pATP) were prepared, and their composition and structure were characterized. The fluorescence behavior of prepared quantum dots with acidity was investigated. The following results were obtained. The fluorescence of CdZnSeS-pATP quantum dots could decrease with increases in acidity because pATP dissociated from the surfaces of the quantum dots due to protons or undissociated weak acids. Based on this feature, a method for determining the acidity of paper-based relics was constructed, and this method was used to evaluate the acidity of actual paper-based relics. Obviously, for a given paper sample, since both free protons and bound protons can be determined by this method, the acidity measured by this method is more reasonable than that by pH meter.

Facile Synthesis and Characterization of CdSe/ZnSe Core/Shell and ZnxCd1−xSe Alloy Quantum Dots via Non-organometallic Route

2018 ◽  
Vol 30 (1) ◽  
pp. 161-169 ◽  
Author(s):  
Oluwatobi Samuel Oluwafemi ◽  
Vuyelwa Ncapayi ◽  
Sundararajan Parani ◽  
Ncediwe Tsolekile
Keyword(s):  
Quantum Dots ◽  
Synthesis And Characterization ◽  
Core Shell ◽  
Facile Synthesis ◽  
Alloy Quantum Dots

scholarly journals Synthesis of Mn-Doped ZnSe-ZnS Alloy Quantum Dots by a Hydrothermal Method

2019 ◽  
Vol 48 (9) ◽  
pp. 1081-1083 ◽  
Author(s):  
Hisaaki Nishimura ◽  
Yuxin Lin ◽  
Masayuki Hizume ◽  
Taichi Taniguchi ◽  
Naoteru Shigekawa ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Hydrothermal Method ◽  
Alloy Quantum Dots ◽  
Mn Doped

scholarly journals Formation of ZnO/Zn0.5Cd0.5Se Alloy Quantum Dots in the Presence of High Oleylamine Contents

Nanomaterials ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 999
Author(s):  
Yi-An Chen ◽  
Kuo-Hsien Chou ◽  
Yi-Yang Kuo ◽  
Cheng-Ye Wu ◽  
Po-Wen Hsiao ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Quantum Dots ◽  
Particle Size ◽  
X Ray Diffraction ◽  
One Pot ◽  
X Ray ◽  
Transmission Electron ◽  
Average Size ◽  
Alloy Quantum Dots ◽  
First Time

To the best of our knowledge, this report presents, for the first time, the schematic of the possible chemical reaction for a one-pot synthesis of Zn0.5Cd0.5Se alloy quantum dots (QDs) in the presence of low/high oleylamine (OLA) contents. For high OLA contents, high-resolution transmission electron microscopy (HRTEM) results showed that the average size of Zn0.5Cd0.5Se increases significantly from 4 to 9 nm with an increasing OLA content from 4 to 10 mL. First, [Zn(OAc)2]–OLA complex can be formed by a reaction between Zn(OAc)2 and OLA. Then, Fourier transform infrared (FTIR) spectroscopy and X-ray diffraction (XRD) data confirmed that ZnO is formed by thermal decomposition of the [Zn(OAc)2]–OLA complex. The results indicated that ZnO grew on the Zn0.5Cd0.5Se surface, thus increasing the particle size. For low OLA contents, HRTEM images were used to estimate the average sizes of the Zn0.5Cd0.5Se alloy QDs, which were approximately 8, 6, and 4 nm with OLA loadings of 0, 2, and 4 mL, respectively. We found that Zn(OAc)2 and OLA could form a [Zn(OAc)2]–OLA complex, which inhibited the growth of the Zn0.5Cd0.5Se alloy QDs, due to the decreasing reaction between Zn(oleic acid)2 and Se2−, which led to a decrease in particle size.

CsPbBr 3 ‐Quantum‐Dots/Polystyrene@Silica Hybrid Microsphere Structures with Significantly Improved Stability for White LEDs

2019 ◽  
pp. 1900546 ◽  
Author(s):  
Weiqiang Yang ◽  
Fei Gao ◽  
Yue Qiu ◽  
Weizhen Liu ◽  
Haiyang Xu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
White Leds ◽  
Improved Stability ◽  
Silica Hybrid

Raman studies on Ag-ion doped CdZnS luminescent alloy quantum dots

2010 ◽  
Vol 495 (1-3) ◽  
pp. 63-68 ◽  
Author(s):  
Ruchi Sethi ◽  
Prashant K. Sharma ◽  
A.C. Pandey ◽  
Lokendra Kumar
Keyword(s):  
Quantum Dots ◽  
Alloy Quantum Dots

Electronic structures of alloy quantum dots with nonuniform composition

2011 ◽  
Vol 81 (4) ◽  
pp. 425-430 ◽  
Author(s):  
H. Ye ◽  
P. Lu ◽  
Z. Yu ◽  
D. Wang ◽  
Y. Liu
Keyword(s):  
Quantum Dots ◽  
Electronic Structures ◽  
Alloy Quantum Dots

Quantum Dots: Blue Liquid Lasers from Solution of CdZnS/ZnS Ternary Alloy Quantum Dots with Quasi-Continuous Pumping (Adv. Mater. 1/2015)

2015 ◽  
Vol 27 (1) ◽  
pp. 168-168
Author(s):  
Yue Wang ◽  
Kheng Swee Leck ◽  
Van Duong Ta ◽  
Rui Chen ◽  
Venkatram Nalla ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Ternary Alloy ◽  
Alloy Quantum Dots
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