Synthesis of CdS Quantum Dots for Detection of Copper (II) Using Fluorescence Spectroscopy

2011 ◽  
Vol 306-307 ◽  
pp. 1334-1337 ◽  
Author(s):  
Meng Zhang ◽  
Fu Wei Wan ◽  
Shen Guang Ge ◽  
Jing Hua Yu
Keyword(s):  
Quantum Dots ◽  
Fluorescence Intensity ◽  
Colloidal Solution ◽  
Low Cost ◽  
Aqueous System ◽  
Cds Quantum Dots ◽  
High Quality ◽  
Cds Qds ◽  
Partical Size

We report the synthesis and characterization of a low-cost high-quality CdS quantum dots (QDs).The synthesis was performed in aqueous system. The aqueous CdS colloidal solution was prepared using thioglycollic acid as a capping agent. Zetasizer Nano ZS (Malvern, UK) was employed to characterize the partical size of CdS QDs. The UV-vis and photoluminescence (PL) spectra of samples were systematically characterized (the full width at half maximum was 38 nm). The maximum photoluminescence (PL) quantum yield (QY) was as high as 68.5 %. The fluorescence intensity was enhanced by copper (II). The relative fluorescence intensity was linear to copper (II) concentration over the range 4.0 ×10-6 - 2.8×10-5 g mL-1. The regression equation was ΔIF= 59.07+ 90.57c (c / μg mL-1). The highly monodispersed CdS QDs could be used in many fields.

scholarly journals Surface-modified Colloid CdTe/CdS Quantum Dots by a Biocompatible Thiazolidine Derivative as Promising Platform for Immobilization of Glucose Oxidase: Application to Fluorescence Sensing of Glucose

2021 ◽  
Author(s):  
Rahman Hallaj ◽  
Zahra Hosseinchi
Keyword(s):  
Quantum Dots ◽  
Glucose Oxidase ◽  
Limit Of Detection ◽  
Low Cost ◽  
Fluorescence Emission ◽  
Cds Quantum Dots ◽  
Fluorescence Sensing ◽  
Experimental Conditions ◽  
Glucose Determination ◽  
Cds Qds

Abstract This work focuses on the synthesis of novel modified core-shell CdTe/CdS quantum dots (QDs) and develops as a fluorescence sensor for glucose determination. The (E)-2,2'-(4,4'-dioxo-2,2'-dithioxo-2H,2'H-[5,5'-bithiazolylidene]-3,3'(4H,4'H)-diyl)bis(3- mercaptopropanoic acid) (DTM) as a new derivative of thiazolidine was synthesized and characterized and used to surface-modification of CdTe/CdS QDs. DTM-capped CdTe/CdS QDs used to immobilization of glucose oxidase (GOD). The intensity fluorescence emission of the CdSe/CdS-DTM/GOD is highly sensitive to the concentration of H2O2 as a byproduct of the catalytic oxidation of glucose. The experimental results showed that the quenched fluorescence was proportional to the glucose concentration within the range of 10 nM − 0.32 µM under optimized experimental conditions. The limit of detection of this system was found to be 4.3 nM. Compared with most of the existing methods, this newly developed system possesses many advantages, including simplicity, low cost, and good sensitivity.

scholarly journals Synthesis and optical properties of CdS quantum dots via paraffin liquid and oleic acid

2019 ◽  
Vol 14 (29) ◽  
pp. 169-174
Author(s):  
Zainab S. Sadeq
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Oleic Acid ◽  
Optimum Condition ◽  
Low Cost ◽  
Small Concentration ◽  
Cds Quantum Dots ◽  
Cds Qds ◽  
Paraffin Liquid

In this study, an easy, low-cost, green, and environmentallyfriendlier reagents have been used to prepare CdS QDs, in chemicalreaction method by mixed different ratio of CdO and sulfur inparaffin liquid as solvent and oleic acid as the reacting media indifferent concentration to get the optimum condition of the reactionto formation CdS QDs. The results give an indication that thebehavior is at small concentration of 4ml of the oleic acid is bestconcentration which give CdS QDs of small about to 9.23 nm withnano fiber configuration.

Synthesis and Characterization of Polystyrene-Supported FePt Nanoparticles and CdS Quantum Dots

2008 ◽  
Vol 8 (9) ◽  
pp. 4752-4756
Author(s):  
Je Yong Moon ◽  
Yongmin Chang ◽  
Jeunghee Park ◽  
Gang Ho Lee
Keyword(s):  
Quantum Dots ◽  
Synthesis And Characterization ◽  
Fept Nanoparticles ◽  
Cds Quantum Dots ◽  
Polystyrene Matrix ◽  
Cds Qds ◽  
General Method

We present a general method of supporting nanoparticles by using polymers. As a demonstration, a polystyrene was employed to rigidly support the superparamagnetic FePt nanoparticles and CdS QDs. We successfully fabricated the FePt nanoparticles and CdS QDs rigidly supported in a polystyrene matrix by directly blending the FePt nanoparticles and CdS QDs with the polystyrene at melt state of polystyrene. We characterized them with TEM, XRD, and PL spectrometer.

Enhanced electrochemiluminescence of CdS quantum dots capped with mercaptopropionic acid activated by EDC for Zika virus detection

The Analyst ◽  
2021 ◽  
Author(s):  
Hui-Jun Zhang ◽  
Jin Zhu ◽  
Ning Bao ◽  
Shou-Nian Ding
Keyword(s):  
Quantum Dots ◽  
Zika Virus ◽  
Virus Detection ◽  
Cds Quantum Dots ◽  
Mercaptopropionic Acid ◽  
Sandwich Type ◽  
Cds Qds

The mechanism of enhanced ECL of MPA@CdS QDs by EDC activation was investigated, and a sandwich-type ECL immunosensor has been designed for Zika virus detection.

scholarly journals Effect of dopant concentration and the role of ZnS shell on optical properties of Sm3+ doped CdS quantum dots

RSC Advances ◽  
2021 ◽  
Vol 11 (14) ◽  
pp. 7961-7971
Author(s):  
N. D. Vinh ◽  
P. M. Tan ◽  
P. V. Do ◽  
S. Bharti ◽  
V. X. Hoa ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Dopant Concentration ◽  
Core Shell ◽  
Cds Quantum Dots ◽  
Cds Qds

The role of samarium (Sm) dopant on the structural, morphological, and optical properties of CdS QDs and CdS/ZnS core/shell QDs was methodically reported.

scholarly journals Synthesis and characterization of CdSxSe1−xalloy quantum dots with composition-dependent band gaps and paramagnetic properties

RSC Advances ◽  
2018 ◽  
Vol 8 (52) ◽  
pp. 30002-30011 ◽  
Author(s):  
Yueh-Chi Chung ◽  
Chien-Hsin Yang ◽  
Hao-Wen Zheng ◽  
Ping-Szu Tsai ◽  
Tzong-Liu Wang
Keyword(s):  
Quantum Dots ◽  
Quantum Yield ◽  
Fluorescence Intensity ◽  
Band Gaps ◽  
Synthesis And Characterization ◽  
Paramagnetic Properties

Both the fluorescence intensity and quantum yield of all the nanocrystals are much enhanced after the CdSxSe1−xQD cores are coated with a ZnS shell.

scholarly journals Citric Acid Capped CdS Quantum Dots for Fluorescence Detection of Copper Ions (II) in Aqueous Solution

Nanomaterials ◽  
2018 ◽  
Vol 9 (1) ◽  
pp. 32 ◽  
Author(s):  
Zhezhe Wang ◽  
Xuechun Xiao ◽  
Tong Zou ◽  
Yue Yang ◽  
Xinxin Xing ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Quantum Dots ◽  
Citric Acid ◽  
Limit Of Detection ◽  
Copper Ions ◽  
High Sensitivity ◽  
Fluorescence Sensor ◽  
Cds Quantum Dots ◽  
Detection Range ◽  
Cds Qds

Citric acid capped CdS quantum dots (CA-CdS QDs), a new assembled fluorescent probe for copper ions (Cu2+), was synthesized successfully by a simple hydrothermal method. In this work, the fluorescence sensor for the detection of heavy and transition metal (HTM) ions has been extensively studied in aqueous solution. The results of the present study indicate that the obtained CA-CdS QDs could detect Cu2+ with high sensitivity and selectivity. It found that the existence of Cu2+ has a significant fluorescence quenching with a large red shifted (from greenish-yellow to yellowish-orange), but not in the presence of 17 other HTM ions. As a result, Cu2S, the energy level below the CdS conduction band, could be formed at the surface of the CA-CdS QDs and leads to the quenching of fluorescence of CA-CdS QDs. Under optimal conditions, the copper ions detection range using the synthesized fluorescence sensor was 1.0 × 10‒8 M to 5.0 × 10‒5 M and the limit of detection (LOD) is 9.2 × 10‒9 M. Besides, the as-synthesized CA-CdS QDs sensor exhibited good selectivity toward Cu2+ relative to other common metal ions. Thus, the CA-CdS QDs has potential applications for detecting Cu2+ in real water samples.

scholarly journals Fluorine-Doped Tin Oxide Colloidal Nanocrystals

Nanomaterials ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 863 ◽  
Author(s):  
Owen Kendall ◽  
Pierce Wainer ◽  
Steven Barrow ◽  
Joel van Embden ◽  
Enrico Della Gaspera
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Tin Oxide ◽  
Near Infrared ◽  
Transparent Electrode ◽  
High Quality ◽  
Detailed Characterization

Fluorine-doped tin oxide (FTO) is one of the most studied and established materials for transparent electrode applications. However, the syntheses for FTO nanocrystals are currently very limited, especially for stable and well-dispersed colloids. Here, we present the synthesis and detailed characterization of FTO nanocrystals using a colloidal heat-up reaction. High-quality SnO2 quantum dots are synthesized with a tuneable fluorine amount up to ~10% atomic, and their structural, morphological and optical properties are fully characterized. These colloids show composition-dependent optical properties, including the rise of a dopant-induced surface plasmon resonance in the near infrared.

Synthesis and characterization of CdS quantum dots in polystyrene microbeads

2005 ◽  
Author(s):  
Yang Li ◽  
Eric Chun Yeung Liu ◽  
Nigel Pickett ◽  
Peter J. Skabara ◽  
Siobhan S. Cummins ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Synthesis And Characterization ◽  
Cds Quantum Dots
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