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.

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 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.

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.

Photoluminescence study of oleic acid capped and hexanoic acid washed CdS quantum dots

RSC Advances ◽  
2016 ◽  
Vol 6 (34) ◽  
pp. 28316-28321 ◽  
Author(s):  
Neetesh Kumar ◽  
Firoz Alam ◽  
Viresh Dutta
Keyword(s):  
Quantum Dots ◽  
Oleic Acid ◽  
Hexanoic Acid ◽  
Adsorbed Oxygen ◽  
Cds Quantum Dots ◽  
Defect Emission ◽  
Photoluminescence Study ◽  
Cds Qds

The excitonic and defect emission from CdS QDs is quenches in vacuum due to removal of adsorbed oxygen from the QD surface.

scholarly journals Photoacoustic Study of CdS QDs for Application in Quantum-Dot-Sensitized Solar Cells

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
S. Abdallah ◽  
N. Al-Hosiny ◽  
Ali Badawi
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Solar Cells ◽  
Current Density ◽  
Cds Quantum Dots ◽  
Counter Electrodes ◽  
Redox Species ◽  
Cds Qds ◽  
Photovoltaic Characterization ◽  
Sensitized Solar Cells

The optical properties and photovoltaic characterization of CdS quantum dots sensitized solar cells (QDSSCs) were studied. CdS QDs were prepared by the chemical solution deposition (CD) technique. Photoacoustic spectroscopy (PA) was employed to study the optical properties of the prepared samples. The sizes of the CdS QDs were estimated from transmission electron microscope (TEM) micrographs gives radii ranged from 1.57 to 1.92 nm. The current density-voltage (J-V) characteristic curves of the assembled QDSSCs were measured. Fluorine doped Tin Oxide (FTO) substrates were coated with 20 nm-diameter TiO2nanoparticles (NPs). Presynthesized colloidal CdS quantum dots of different particles size were deposited on the TiO2-coated substrates using direct adsorption (DA) method. The FTO counter electrodes were coated with platinum, while the electroelectrolyte containingI-/I-3redox species was sandwiched between the two electrodes. The short current density (Jsc) and efficiency (η) increases as the particle size increases. The values ofJscincreases linearly with increasing the intensities of the sun light which indicates the greater sensitivity of the assembled cells.

Low-Temperature Synthesis of Tetrapod CdSe/CdS Quantum Dots through Microfluidic Reactor

Nanoscale ◽  
2021 ◽  
Author(s):  
Weishuo Xing ◽  
Shuang Zhang ◽  
Ruoting An ◽  
Wengang Bi ◽  
Chong Geng ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Cross Section ◽  
Synthesis Methods ◽  
Absorption Cross ◽  
Cds Quantum Dots ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis ◽  
Light Emitting ◽  
Cds Qds

Tetrapod CdSe/CdS quantum dots (QDs) attracted extensive research interest in light-emitting applications due to their anisotropic optical properties and large absorption cross section. Traditional synthesis methods for tetrapod CdSe/CdS QDs...

SYNTHESIS OF NANOCRYSTALLINE CdS QUANTUM DOTS VIA PARAFFIN LIQUID AS SOLVENT AND OLEIC ACID AS THE REACTING MEDIA

2012 ◽  
Vol 11 (06) ◽  
pp. 1240038 ◽  
Author(s):  
WENJIANG LI ◽  
MINGRUI WANG ◽  
FEI XIE ◽  
SHA ZHU ◽  
YUE ZHAO
Keyword(s):  
Quantum Dots ◽  
Oleic Acid ◽  
Semiconductor Nanocrystals ◽  
Emission Spectra ◽  
Medical Diagnostics ◽  
X Ray Diffraction ◽  
Hrtem Observation ◽  
Average Grain Size ◽  
Cds Qds ◽  
Paraffin Liquid

Fluorescent semiconductor nanocrystals have been widely used as fluorescent materials in chemical sensors, biotechnology, medical diagnostics, biological imaging and many other fields. Compared to the conventional organic fluorophores, the inorganic quantum dots (QDs) have many advantages, including broad absorption spectra, narrow emission spectra, good photostability and long fluorescent lifetime after excitation. Here, the high quality CdS QDs were synthesized directly from sulfur and CdO using the paraffin liquid as solvent and the oleic acid as the reacting media. The synthesized CdS QDs with a zinc blende (cubic) crystal structure were proved by X-ray diffraction. HRTEM observation revealed that the CdS QDs were uniform and the average grain size was about 4 nm. The optical properties of the CdS QDs were characterized by using photoluminescence (PL) spectrophotometer and Ultraviolet-visible (UV-Vis) absorption spectrophotometer. The formation mechanism of CdS QDs in the paraffin liquid and oleic acid system was proposed.

Aligning CdS Quantum Dots in Apo-Ferritin Protein and PS-b-P2VP Organic Templates

2013 ◽  
Vol 832 ◽  
pp. 675-680
Author(s):  
S.A. Shamsudin ◽  
Hirokazu Hasegawa ◽  
Mikihito Takenaka ◽  
Saijo Kenji
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Cancer Cells ◽  
Cadmium Sulphide ◽  
Cds Quantum Dots ◽  
Organic Templates ◽  
Ps I ◽  
Cds Qds ◽  
Guest System ◽  
Photo Stability

Quantum dots (QDs) have a great potential to be applied as a biosensor to detect cancer cells because of their properties such as high photoluminescence, photo stability, narrow peak of luminescence, etc. However, cadmium sulphide (CdS) quantum dots are toxic and hydrophobic, making it impossible to be applied into biomaterials. A template is needed to make CdS QDs nontoxic and hydrophilic. The optical properties of these QDs are needed to be protected. To achieve this purpose, the template for CdS QDs has been designed by capping CdS QDs with apo-ferritin shells before aligning them onto cylindrical perpendicular PS-b-P2VP template, with the aim of locating CdS QDs appropriately in sequence. A host-guest system can be developed.

Photoluminescence and optical nonlinearity of CdS quantum dots synthesized in a functional copolymer hydrogel template

2017 ◽  
Vol 41 (9) ◽  
pp. 3524-3536 ◽  
Author(s):  
Jolly Vakayil Antony ◽  
Jisha J. Pillai ◽  
Philip Kurian ◽  
V. P. N. Nampoori ◽  
George Elias Kochimoolayil
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Acrylic Acid ◽  
Acid Content ◽  
Nonlinear Optical ◽  
Optical Nonlinearity ◽  
Cds Quantum Dots ◽  
Copolymer Hydrogel ◽  
Cds Qds ◽  
Linear And Nonlinear

The acrylic acid content in the copolymer influences the size of the CdS QDs as well as the linear and nonlinear optical properties of the copolymer.

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.

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