Spectacular oscillations in the dark and photocurrent in thiol-capped CdS quantum dots embedded in PMMA matrix

RSC Advances ◽  
2015 ◽  
Vol 5 (18) ◽  
pp. 13613-13622
Author(s):  
Bipul Biswas ◽  
Avijit Chowdhury ◽  
Biswanath Mallik
Keyword(s):  
Quantum Dots ◽  
Bias Voltage ◽  
Oscillatory Behaviour ◽  
Cds Quantum Dots ◽  
Sample Cell ◽  
Pmma Matrix ◽  
Constant Bias ◽  
Cds Qds ◽  
Dark Conditions ◽  
Constant Bias Voltage

Oscillatory behaviour of current in thiol-capped CdS QDs embedded PMMA matrix under dark conditions at different sample cell temperatures: (1) 303, (2) 308, (3) 313, (4) 318, (5) 323 and (6) 328 K with a constant bias voltage of 27 V.

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 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 MOF-Derived Porous Fe2O3 Nanoparticles Coupled with CdS Quantum Dots for Degradation of Bisphenol A under Visible Light Irradiation

Nanomaterials ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1701 ◽  
Author(s):  
Ruowen Liang ◽  
Zhoujun He ◽  
Chen Zhou ◽  
Guiyang Yan ◽  
Ling Wu
Keyword(s):  
Quantum Dots ◽  
Bisphenol A ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
High Performance ◽  
Energy Levels ◽  
Light Irradiation ◽  
Cds Quantum Dots ◽  
Endocrine Disrupting Chemical ◽  
Cds Qds

In this work, CdS quantum dots (QDs) were planted on magnetically recyclable porous Fe2O3 (denoted as F450) to obtain CdS QDs/porous Fe2O3 hybrids (denoted as X–CdS/F450, in which X is the immersion times of CdS QDs). Porous Fe2O3 was first obtained by pyrolysis from an iron-containing metal–organic framework by a two-step calcination method. Next, CdS QDs (of average size 3.0 nm) were uniformly and closely attached to the porous F450 via a sequential chemical-bath deposition strategy. As expected, the X–CdS/F450 hybrids serve as high-performance photocatalysts for the degradation of bisphenol A, a typical endocrine-disrupting chemical. Almost ∼100% of the bisphenol A was degraded over 5-CdS/F450 after visible light irradiation for 30 min (λ ≥ 420 nm). In comparison, the degradation efficiency of pure F450 powder is 59.2%. The high performance of 5-CdS/F450 may be ascribable to the fast electron transport of porous F450, the intense visible-light absorption of the CdS QDs and the matched energy levels between CdS and F450. More significantly, through the photocatalytic degradation reaction, the X–CdS/F450 hybrids can easily be recovered magnetically and reused in subsequent cycles, indicating their stability and recyclability.

scholarly journals A Novel CdS Quantum Dots Decorated 3D Bi2O2CO3 Hierarchical Nanoflower with Enhanced Photocatalytic Performance

Catalysts ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1046 ◽  
Author(s):  
Zhilin Ji ◽  
Hongwei Wang ◽  
Xilin She
Keyword(s):  
Quantum Dots ◽  
Synergistic Effect ◽  
Rhodamine B ◽  
Active Sites ◽  
Photocatalytic Performance ◽  
High Efficiency ◽  
Environmental Pollutants ◽  
Cds Quantum Dots ◽  
Design And Synthesis ◽  
Cds Qds

Heterojunction engineering has shown great potential in the field of photocatalysis to deal with environmental pollutants. The design and synthesis of heterojunction photocatalysts with high efficiency and stability still face great challenges. In this work, a novel CdS quantum dots (QDs) decorated 3D Bi2O2CO3 hierarchical nanoflower heterojunction photocatalyst (Bi2O2CO3/CdS QDs) was synthesized to investigate the photocatalytic Rhodamine B (RhB) degradation performance. CdS QDs were evenly distributed on the surface of the Bi2O2CO3 nanoflower. Bi2O2CO3/CdS QDs showed significantly enhanced photocatalytic RhB degradation performance compared with pristine Bi2O2CO3 and CdS QDs. The enhanced photocatalytic performance was attributed to the synergistic effect of hierarchical structure and heterojunction, which greatly increased the active sites of the reaction and the photogenerated carriers transfer.

Self-assembled CdS quantum dots in carbon nanotubes: induced polysulfide trapping and redox kinetics enhancement for improved lithium–sulfur battery performance

2019 ◽  
Vol 7 (2) ◽  
pp. 806-815 ◽  
Author(s):  
Dong Cai ◽  
Lili Wang ◽  
La Li ◽  
Yupu Zhang ◽  
Junzhi Li ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Quantum Dots ◽  
Rate Performance ◽  
Cds Quantum Dots ◽  
Redox Kinetics ◽  
Lithium Sulfur Batteries ◽  
Cds Qds ◽  
Self Assembled ◽  
Sulfur Battery ◽  
Lithium Sulfur

Self-assembled CdS-QDs in carbon nanotubes are highly efficient cathode materials for lithium–sulfur batteries with improved rate performance and cycle life. The configuration suppresses polysulfide shuttling and enhances redox kinetics.

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 Surface modification effects on defect-related photoluminescence in colloidal CdS quantum dots

2018 ◽  
Vol 20 (17) ◽  
pp. 11954-11958 ◽  
Author(s):  
TaeGi Lee ◽  
Kunio Shimura ◽  
DaeGwi Kim
Keyword(s):  
Quantum Dots ◽  
Surface Modification ◽  
Cds Quantum Dots ◽  
Cds Qds ◽  
Colloidal Cds

We investigated the effects of surface modification on the defect-related PL in colloidal CdS QDs.

CdS quantum dots immobilized on calcium alginate microbeads for rapid and selective detection of Hg2+ ions

RSC Advances ◽  
2015 ◽  
Vol 5 (93) ◽  
pp. 76275-76284 ◽  
Author(s):  
Ambika Kumar ◽  
Raj Kumar Dutta
Keyword(s):  
Quantum Dots ◽  
Calcium Alginate ◽  
Selective Detection ◽  
Cds Quantum Dots ◽  
Cds Qds

Immobilized CdS QDs for selective detection and pre-concentration of Hg2+.

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.

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