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

scholarly journals Sensitive Organophosphorus and Carbamate Pesticides Biosensor Based on Acetylcholinesterase and CdZnSe/ZnS Ternary Alloy Quantum Dots

2014 ◽  
Vol 24 (3) ◽  
pp. 225
Author(s):  
Nguyen Ngoc Hai ◽  
Nguyen Hai Yen ◽  
Duong Thi Giang ◽  
Nguyen Duc Nhat ◽  
Pham Thu Nga ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Ternary Alloy ◽  
Ph Value ◽  
Decomposition Process ◽  
Pesticide Detection ◽  
Carbamate Pesticides ◽  
Surrounding Environment ◽  
Acetylcholinesterase Enzyme ◽  
Alloy Quantum Dots

This report presents the results of ternary alloy quantum dots (TQDs) manufacturing and its superior optical properties to fabricate the biosensor for pesticide detection. The explanation for the changes in PL intensity based on the change of electronic charges that alters the pH value of the surrounding environment, and the types of interaction on the surface of CdZnSe/ZnS TQDs were discussed. We show the decomposition process of the indicator (ATCh) with the catalysis from acetylcholinesterase enzyme (AChE) that inhibited by organophosphorus and carbamate pesticides including Trichlorfon (TF), Cypermethrin (CH), Abamectin (AT), and Carbosulfan (CS) with concentrations from 0.05 ppm to 10 ppm.

scholarly journals Blue Liquid Lasers from Solution of CdZnS/ZnS Ternary Alloy Quantum Dots with Quasi-Continuous Pumping

2014 ◽  
Vol 27 (1) ◽  
pp. 169-175 ◽  
Author(s):  
Yue Wang ◽  
Kheng Swee Leck ◽  
Van Duong Ta ◽  
Rui Chen ◽  
Venkatram Nalla ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Ternary Alloy ◽  
Alloy Quantum Dots

scholarly journals Mechanism to Detect Pesticide Residues in Tealeaves Based on CdZnSe/ZnS Ternary Alloy Quantum Dots

2015 ◽  
Vol 25 (1) ◽  
pp. 67
Author(s):  
Nguyen Ngọc Hai ◽  
Nguyen Hai Yen ◽  
Duong Thi Giang ◽  
Dinh Hung Cuong ◽  
Nguyen Duc Nhat ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Ternary Alloy ◽  
Luminescence Intensity ◽  
Ph Value ◽  
Before And After ◽  
Potential Applications ◽  
Composition Structure ◽  
Alloy Quantum Dots ◽  
The Relationship

In this report, we present the optical properties of the biosensors fabricated from CdZnSe/ZnS quantum dots. The optical properties such as absorption and emission of the ternary quantum dots before and after coupling with the protein molecules like streptavidine (SA) and acetylcholinesterase enzymes (AChE), to form a biosensor structure, will be presented. In particular, the changes in luminescence intensity according to the pH value of the solution environment containing biosensor have been considered, before and after the presence of pesticides. The changes in luminescence intensity of the biosensor after the presence of pesticide over time from 2 seconds to 26 minutes were also surveyed. We have been carried out the tests to determine the trace amounts of commercial pesticides like Motox 5EC, containing 5% cypermethrin and Tungatin 10 EC, containing 10% abamectin, on the real samples of tealeaves. Some characteristics of the relationship between composition, structure, and special optical properties of ternary alloy quantum dots will also be presented. These studies open up the potential applications of  ternary quantum dots for agricultural production.

Study on the fabrication of CdZnSe/ZnSeS ternary alloy quantum dots

2015 ◽  
Vol 12 (5/6/7) ◽  
pp. 525 ◽  
Author(s):  
Pham Thu Nga ◽  
Nguyen Hai Yen ◽  
Dinh Hung Cuong ◽  
Nguyen Ngoc Hai ◽  
Nguyen Xuan Nghia ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Ternary Alloy ◽  
Alloy Quantum Dots

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.

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