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.

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 Changes in Optical Properties upon Dye–Clay Interaction: Experimental Evaluation and Applications

Nanomaterials ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 197
Author(s):  
Giorgia Giovannini ◽  
René M. Rossi ◽  
Luciano F. Boesel
Keyword(s):  
Optical Properties ◽  
Hybrid Materials ◽  
High Performance ◽  
Fluorescent Properties ◽  
Chemical Mechanisms ◽  
Strong Electrostatic Interaction ◽  
Potential Applications ◽  
Photochemical Properties ◽  
Physical And Chemical ◽  
The Relationship

The development of hybrid materials with unique optical properties has been a challenge for the creation of high-performance composites. The improved photophysical and photochemical properties observed when fluorophores interact with clay minerals, as well as the accessibility and easy handling of such natural materials, make these nanocomposites attractive for designing novel optical hybrid materials. Here, we present a method of promoting this interaction by conjugating dyes with chitosan. The fluorescent properties of conjugated dye–montmorillonite (MMT) hybrids were similar to those of free dye–MMT hybrids. Moreover, we analyzed the relationship between the changes in optical properties of the dye interacting with clay and its structure and defined the physical and chemical mechanisms that take place upon dye–MMT interactions leading to the optical changes. Conjugation to chitosan additionally ensures stable adsorption on clay nanoplatelets due to the strong electrostatic interaction between chitosan and clay. This work thus provides a method to facilitate the design of solid-state hybrid nanomaterials relevant for potential applications in bioimaging, sensing and optical purposes.

A Nanoscale Adventure with Silicon: Synthesis, Surface Chemistry, and other Surprises

2015 ◽  
Vol 242 ◽  
pp. 383-390
Author(s):  
Md Hosnay Mobarok ◽  
Tapas K. Purkait ◽  
Jonathan G.C. Veinot
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Surface Chemistry ◽  
Research Group ◽  
Size Dependent ◽  
Earth Abundant ◽  
Potential Applications ◽  
Si Quantum Dots

The preparation and surface chemistry Si quantum dots (SiQDs) are currently an intense focus of research because of their size dependent optical properties and many potential applications. SiQDs offer several advantages over other quantum dots; Si is earth abundant, non-toxic and biocompatible. This account briefly highlights recent advancements made by our research group related to the synthesis, functionalization, surface dependent optical properties and applications of SiQDs.

scholarly journals Polyvinylpyrrolidone Nanofibers Encapsulating an Anhydrous Preparation of Fluorescent SiO2–Tb3+ Nanoparticles

Nanomaterials ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 510 ◽  
Author(s):  
Jianhang Shi ◽  
Yanxin Wang ◽  
Linjun Huang ◽  
Peng Lu ◽  
Qiuyu Sun ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Optical Properties ◽  
Hybrid Nanoparticles ◽  
Hybrid Nanofibers ◽  
Transmission Electron ◽  
Potential Applications ◽  
Composition Structure ◽  
Photoluminescent Materials ◽  
Influence Of Ph

A novel anhydrous preparation of silica (SiO2)-encapsulated terbium (Tb3+) complex nanoparticles has been investigated. The SiO2-Tb3+ nanoparticles are incorporated in electrospun polyvinylpyrrolidone hybrid nanofibers. Transmission electron microscopy confirms that Tb3+ complexes are uniformly and stably encapsulated in or carried by nanosilica. The influence of pH on the fluorescence of Tb3+ complexes is discussed. The properties, composition, structure, and luminescence of the resulting SiO2–Tb3+ hybrid nanoparticles are investigated in detail. There is an increase in the fluorescence lifetime of SiO2–Tb3+ nanoparticles and SiO2–Tb3+/polyvinylpyrrolidone (PVP) hybrid nanofibers compared with the pure Tb3+ complexes. Due to the enhanced optical properties, the fluorescent hybrid nanofibers have potential applications as photonic and photoluminescent materials.

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 Preparation and Optical Properties of AgIn Alloy Quantum Dots Doped Glass

2014 ◽  
Vol 29 (10) ◽  
pp. 1034
Author(s):  
YIN De-Wu ◽  
LIU Zhen ◽  
YANG Xin-Yu ◽  
ZHANG Xi-Yan ◽  
XIANG Wei-Dong
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Alloy Quantum Dots ◽  
Doped Glass

scholarly journals Optical Properties andIn VitroBiological Studies of Oligonucleotide-Modified Quantum Dots

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Valérie A. Gérard ◽  
Mark Freeley ◽  
Eric Defrancq ◽  
Anatoly V. Fedorov ◽  
Yurii K. Gun’ko
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Biological Imaging ◽  
Water Soluble ◽  
Biological Applications ◽  
Potential Applications ◽  
Biochemical Mechanisms

Water-soluble semiconducting nanocrystals or quantum dots (QDs) have attracted much interest in recent years due to their tuneable emission and potential applications in photonics and biological imaging. Fluorescence resonance energy transfer (FRET) processes are very important for elucidating biochemical mechanismsin vitro, and QDs constitute an excellent substrate for this purpose. In this work, new oligonucleotide-functionalised CdTe-based QDs were prepared, characterised and biologically tested. These QDs demonstrated interesting optical properties as well as remarkablein vitrobehaviour and potential for a range of biological applications.

scholarly journals STRUCTURAL AND OPTICAL PROPERTIES OF CD1-XZNXS ALLOY QUANTUM DOTS

2015 ◽  
Vol 26 (Issue 2-B) ◽  
pp. 1-16
Author(s):  
A. A. ABD EL-RAHMAN ◽  
F. I. MANDOUH ◽  
M. B. MOHAMMED ◽  
GH. ADEL ◽  
E. A. MAHMOUD
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Structural And Optical Properties ◽  
Alloy Quantum Dots

Surface chemistry regulates optical properties and cellular interactions of ultrasmall MoS2 quantum dots for biomedical applications

2021 ◽  
Author(s):  
Kangqiang Liang ◽  
Shaohua Qu ◽  
Yixiao Li ◽  
Li-Li Tan ◽  
Li Shang
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Surface Chemistry ◽  
Molybdenum Disulfide ◽  
Biomedical Applications ◽  
Cell Imaging ◽  
Cellular Interactions ◽  
Potential Applications

Molybdenum disulfide quantum dots (MoS2 QDs) have drawn increasing attention owing to their distinct optical properties and potential applications in many fields such as biosensing, photocatalysis and cell imaging. Elucidating...

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