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Journal articles on the topic 'CdS QD'

Author: Grafiati

Published: 6 September 2023

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1

Zhang, Ningning, Xiaoping Zou, and Yanyan Gao. "Heterovalent Cation Substitutional and Interstitial Doping in Semiconductor Sensitizers for Quantum Dot Cosensitized Solar Cell." International Journal of Photoenergy 2015 (2015): 1–10. http://dx.doi.org/10.1155/2015/326850.

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Doped films of TiO2/PbS/CdS have been prepared by successive ionic layer adsorption and reaction (SILAR) method. Bi- and Ag-doped-PbS quantum dot (QD) were produced by admixing Bi3+or Ag+during deposition and the existing forms of the doping element in PbS QD were analyzed. The results show that Bi3+entered the cube space of PbS as donor yielding interstitial doping Bi-doped-PbS QD, while Ag+replaced Pb2+of PbS as acceptor yielding substitutional doping Ag-doped-PbS QD. The novel Bi-doped-PbS/CdS and Ag-doped-PbS/CdS quantum dot cosensitized solar cell (QDCSC) were fabricated and power conversion efficiency (PCE) of 2.4% and 2.2% was achieved, respectively, under full sun illumination.

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2

Zou, Shibing, and Feng Li. "Efficient All-Inorganic CsPbBr3 Perovskite Solar Cells by Using CdS/CdSe/CdS Quantum Dots as Intermediate Layers." Journal of Nanomaterials 2020 (May 6, 2020): 1–11. http://dx.doi.org/10.1155/2020/7946853.

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Highly efficient all-inorganic perovskite solar cells require a fast charge transfer from CsPbBr3 to TiO2 to reduce the recombination from trap states. Herein, we insert a CdS/CdSe/CdS quantum dot (QD) layer between the TiO2 and CsPbBr3 layers to fabricate all-inorganic perovskite solar cells. By tuning the thicknesses of the CdSe layer of CdS/CdSe/CdS QDs, the conduction band (CB) levels can be adjusted to -3.72~-3.87 eV. After inserting the QD intermediate layer, the energy offset between the CB of TiO2 and CsPbBr3 is reduced, thus leading to a charge transfer rate boost from 0.040×109 to 0.059×109 s−1. The power conversion efficiency (PCE) of the solar cell with QD intermediate layer achieves 8.64%, which is 20% higher than its counterpart without QDs.

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3

Tang, Luping, Chen Liao, Yingqing Guo, and Yangyang Zhang. "Controllable Preparation of Ag-SiO2 Composite Nanoparticles and Their Applications in Fluorescence Enhancement." Materials 16, no. 1 (December 26, 2022): 201. http://dx.doi.org/10.3390/ma16010201.

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Metal nanoparticles have attracted a great deal of interest due to their unique properties of surface plasmon resonance. Metal nanoparticles can enhance the fluorescence emission intensity of quantum dots (QDs) through the local surface plasmon resonance effect, which is mainly determined by the distance between them. Therefore, it is very important to achieve controllable distance between metal and QDs, and study fluorescence enhancement. In this work, the controllable adjustment of the distance between metal nanoparticles and QDs was successfully realized by controlling the thickness of the SiO2 shell of Ag@SiO2 nanoparticles. Firstly, Ag nanoparticles with uniform size distribution and relatively high concentration were prepared, and then the thickness of the SiO2 shell was controlled by controlling the amount of tetra-ethyl orthosilicate (TEOS) in the hydrolysis of TEOS reaction. (3-aminopropyl) triethoxysilane (APS) was used to connect CdS/ZnS QDs with Ag@SiO2 nanoparticles to form Ag@SiO2@CdS/ZnS QD composite nanoparticles. The fluorescence spectra shows that the fluorescence intensity of the Ag@SiO2@CdS/ZnS QD composite nanoparticles is significantly enhanced. Photoexcitation spectra and fluorescence spectra of CdS/ZnS QD and Ag@SiO2@CdS/ZnS QD composite nanoparticles, measured under different energy excitation conditions, indicate that the existence of Ag nanoparticles can enhance the fluorescence intensity of CdS/ZnS QDs. Finally, a further physical mechanism of fluorescence enhancement is revealed.

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4

Smyntyna, V. A., V. M. Skobeeva, and K. A. Verheles. "INFLUENCE OF TECHNOLOGICAL CONDITIONS OF SYNTHESIS ON THE FORMATION OF PHOTOLUMINESCENCE SPECTRA OF CdS QDs." Photoelectronics, no. 30 (December 24, 2021): 75–81. http://dx.doi.org/10.18524/0235-2435.2021.30.262861.

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Here are presented the results of influence of two parameters of synthesis process of quantum dots sulfide cadmium (CdS QD) on the spectrum luminescence, namely, the acid-base balance of the growth solution and the correlation of reaction components (cadmium and sulfur salts). Carried out the syntheses in which the pH solution was changed in the interval of values from 2 to 10. There were also synthesized CdS QD with different ratios of the initial components. The results obtained by evidence of the fact that the technological process has a significant impact on the formation of bands luminescence CdS QDs.

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5

Huang, Xian Nan, Wei Li, and Wei He. "pH Tunable Turn on and Turn off Quantum Dots Conjugated with Poly(2-(Dialkylamino)ethyl Methacrylate)." Advanced Materials Research 998-999 (July 2014): 75–78. http://dx.doi.org/10.4028/www.scientific.net/amr.998-999.75.

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A novel pH sensitive cadmium sulfide quantum dot (CdS QD) was prepared by a coprecipitation method in the presence of pH sensitive poly (2-(dimethylamino) ethyl methacrylate)-co-poly (2-(dibutylamino) ethyl methacrylate)(PDMA-PDBA) copolymer. CdCl2and Na2S were mixed in aqueous media in the presence of PDMA-PDBA. The amine groups of PDMA were anchored on the surface of the formed CdS nanoparticles, whereas the PDBA segment was anchored on the surface to form a hydrophilic palisade at low pH environment, thus turn on the fluorescence CdS QD probe; at high pH value, PDBA segments precipitate and turn off fluorescence because of the phase separation. This novel pH sensitive fluorescene CdS QDs probe have great application potential for target imaging of cancer.

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6

Deodanes, O., J. C. Molina, C. Violantes, D. Pleitez, J. Cuadra, H. Ponce, and C. Rudamas. "White Light Emitting CdS Quantum Dot Devices Coated with Layers of Graphene Carbon Quantum Dots." MRS Advances 5, no. 63 (2020): 3337–43. http://dx.doi.org/10.1557/adv.2020.436.

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AbstractCadmium sulfide quantum dots (CdS QDs) are semiconductor nanoparticles having sizes in the order of nanometers. They are materials that have outstanding properties for down conversion applications. These nanostructures have been used in the fabrication of white light emitting diodes (WLEDs) in the last years. However, inhomogeneous deposition of CdS QD conversion materials allows unwanted UV light escape. In addition, low efficiency due to strong self-quenching effect, incompatibility between CdS QD solution/crystal polyester resin matrix and reabsorption are common problems that need to be solved. In this work, we try to address the incompatibility between the CdS QD solution/crystal polyester resin matrix by using a solvent exchange procedure. To block the unwanted UV-light escape, we coated our devices with a mixture of graphene carbon quantum dot (GCQD) solution/crystal polyester resin matrix. The QDs and the WLED prototypes were characterized by absorption and photoluminescence (PL) spectroscopy. The QDs embedded in the matrix shown a good homogeneous dispersion. On the other hand, the mixture shown a rapid solidification. These facts indicate a good compatibility between the CdS QDs and the crystal polyester resin. We also observed a considerable reduction of unwanted near UV-light. White light emission from WLED devices with common crystal polyester resin and low-cost materials has been achieved.

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7

Zhai, Xiaoman, Yunqian Gong, Wen Yang, Huaizhi Kang, and Xiaoling Zhang. "Mn-doped CdS/ZnS/CdS QD-based fluorescent nanosensor for rapid, selective, and ultrasensitive detection of copper(ii) ion." RSC Advances 5, no. 78 (2015): 63458–64. http://dx.doi.org/10.1039/c5ra11435g.

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8

Na, Weidan, Xiaotong Liu, Tianyu Hu, and Xingguang Su. "Highly sensitive fluorescent determination of sulfide using BSA-capped CdS quantum dots." New Journal of Chemistry 40, no. 2 (2016): 1872–77. http://dx.doi.org/10.1039/c5nj03117f.

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9

Sun, Mingye, Youjin Zheng, Lei Zhang, Liping Zhao, and Bing Zhang. "Influence of heat treatment on hole transfer dynamics in core-shell quantum dot/organic hole conductor hybrid films." Modern Physics Letters B 31, no. 23 (August 20, 2017): 1750218. http://dx.doi.org/10.1142/s0217984917502189.

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The influence of heat treatment on hole transfer (HT) processes from the CdSe/ZnS and CdSe/CdS/ZnS quantum dots (QDs) to 4,4[Formula: see text],4[Formula: see text]-Tris(carbazol-9-yl)-triphenylamine (TCTA) in QD/TCTA hybrid films has been researched with time-resolved photoluminescence (PL) spectroscopy. The PL dynamic results demonstrated a heat-treatment-temperature-dependent HT process from the core-shell CdSe QDs to TCTA. The HT rates and efficiencies can be effectively increased due to reduced distance between core-shell CdSe QDs and TCTA after heat treatment. The CdS shell exhibited a more obvious effect on HT from the core-shell CdSe QDs to TCTA than on electron transfer to TiO2, due to higher barrier for holes to tunnel through CdS shell and larger effective mass of holes in CdS than electrons. These results indicate that heat treatment would be an effective means to further optimize solid-state QD sensitized solar cells and rational design of CdS shell is significant.

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10

Liu, Haiping, Huajie Liu, Haiyan Liu, Duo Zhang, Qian Wang, Shuang Li, Yanhua Cao, and Qingzhao Li. "Study on the genetic damage caused by cadmium sulfide quantum dots in human lymphocytes." Open Life Sciences 17, no. 1 (January 1, 2022): 463–72. http://dx.doi.org/10.1515/biol-2022-0054.

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Abstract Cadmium sulfide quantum dots (CdS QDs) are being developed for sensors, fluorescent probes, and other platforms and are attracting increasing attention. Given the growing demand for QDs, it is clear that there is a need to understand their potential toxicity to organisms. However, little is known regarding the genotoxicity of CdS QDs to humans. Therefore, this study used CdS QDs as the research object, cultured human peripheral blood lymphocytes, and randomly divided them into a control group, CdS I group (CdS QDs), and CdS II group (CdS QDs coated with thioglycolic acid). After cultivation, we measured the olive tail distance, tail length, tail DNA%, lymphocyte micronucleus rate, and aneuploid rate. The comet test results indicated that the indices of the QD group were significantly larger than those of the control group (P < 0.05). The results of the micronucleus and chromosome aberration tests showed that the lymphocyte micronucleus rate and chromosome aneuploid rate in the QD group were significantly increased (P < 0.05) compared with those in the control group. In conclusion, CdS QDs have certain genotoxicity to human peripheral blood lymphocytes, and the DNA damage caused by CdS QDs encapsulated with thioglycolic acid is less severe than that caused by nonencapsulated CdS QDs.

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11

Ganiga, Manjunatha, and Jobin Cyriac. "Detection of PETN and RDX using a FRET-based fluorescence sensor system." Analytical Methods 7, no. 13 (2015): 5412–18. http://dx.doi.org/10.1039/c5ay00416k.

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12

Jiao, Shuang, Jin Wang, Qing Shen, Yan Li, and Xinhua Zhong. "Surface engineering of PbS quantum dot sensitized solar cells with a conversion efficiency exceeding 7%." Journal of Materials Chemistry A 4, no. 19 (2016): 7214–21. http://dx.doi.org/10.1039/c6ta02465c.

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A CdS passivation layer was introduced to a PbS QD surface to synthesize PbS/CdS core/shell QDs through an ion exchange procedure, achieving a record PCE of 7.19% for PbS-based liquid-junction quantum dot sensitized solar cells.

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13

Khataee, Alireza, Roya Lotfi, and Aliyeh Hasanzadeh. "A novel and sensitive chemosensor based on a KMnO4–rhodamine B–CdS quantum dot chemiluminescence system for meropenem detection." Photochemical & Photobiological Sciences 16, no. 2 (2017): 170–77. http://dx.doi.org/10.1039/c6pp00320f.

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The reaction of a KMnO₄–Rh B–l-cysteine capped CdS QD system is described as a novel chemiluminescence (CL) reaction. Meropenem exhibits a quenching effect on KMnO₄–Rh B–l-cysteine capped CdS QDs.

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14

Chen, Lina, Yue Lu, Minshu Qin, Fa Liu, Liang Huang, Jing Wang, Hui Xu, et al. "Preparation of “Ion-Imprinting” Difunctional Magnetic Fluorescent Nanohybrid and Its Application to Detect Cadmium Ions." Sensors 20, no. 4 (February 13, 2020): 995. http://dx.doi.org/10.3390/s20040995.

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In this work, we have fabricated a novel difunctional magnetic fluorescent nanohybrid (DMFN) for the determination of cadmium ions (Cd2+) in water samples, where the “off-on” model and “ion-imprinting” technique were incorporated simultaneously. The DMFN were composed of CdTe/CdS core-shell quantum dots (QD) covalently linked onto the surface of polystyrene magnetic microspheres (PMM) and characterized using ultraviolet-visible spectroscopy (UV-Vis), fluorescence spectroscopy, and transmission electron microscopy (TEM). Based on the favorable magnetic and fluorescent properties of the DMFN, the chemical etching of ethylene diamine tetraacetic acid (EDTA) at the surface produced specific Cd2+ recognition sites and quenched the red fluorescence of outer CdTe/CdS QD. Under optimal determination conditions, such as EDTA concentration, pH, and interfering ions, the working curve of determining Cd2+ was obtained; the equation was obtained Y = 34,759X + 254,894 (R = 0.9863) with a line range 0.05–8 μM, and the detection limit was 0.01 μM. Results showed that synthesized magnetic fluorescent microspheres had high sensitivity, selectivity, and reusability in detection. Moreover, they have significant potential value in fields such as biomedicine, analytical chemistry, ion detection, and fluorescence labeling.

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15

Kim, M. J., L. C. Liu, S. H. Risbud, and R. W. Carpenter. "Nanostructure of semiconductor quantum dots in a borosilicate glass matrix by complementary use of HREM and AEM." Proceedings, annual meeting, Electron Microscopy Society of America 48, no. 4 (August 1990): 728–29. http://dx.doi.org/10.1017/s0424820100176770.

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When the size of a semiconductor is reduced by an appropriate materials processing technique to a dimension less than about twice the radius of an exciton in the bulk crystal, the band like structure of the semiconductor gives way to discrete molecular orbital electronic states. Clusters of semiconductors in a size regime lower than 2R {where R is the exciton Bohr radius; e.g. 3 nm for CdS and 7.3 nm for CdTe) are called Quantum Dots (QD) because they confine optically excited electron- hole pairs (excitons) in all three spatial dimensions. Structures based on QD are of great interest because of fast response times and non-linearity in optical switching applications.In this paper we report the first HREM analysis of the size and structure of CdTe and CdS QD formed by precipitation from a modified borosilicate glass matrix. The glass melts were quenched by pouring on brass plates, and then annealed to relieve internal stresses. QD precipitate particles were formed during subsequent "striking" heat treatments above the glass crystallization temperature, which was determined by differential thermal analysis.

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16

Li, Mei, Chaoying Xu, Lan Wu, Peng Wu, and Xiandeng Hou. "Dually enriched Cu:CdS@ZnS QDs with both polyvinylpyrrolidone twisting and SiO2 loading for improved cell imaging." Chemical Communications 51, no. 17 (2015): 3552–55. http://dx.doi.org/10.1039/c4cc10127h.

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17

Kumar, Neetesh, Firoz Alam, and Viresh Dutta. "Photoluminescence study of oleic acid capped and hexanoic acid washed CdS quantum dots." RSC Advances 6, no. 34 (2016): 28316–21. http://dx.doi.org/10.1039/c6ra04766a.

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18

Wang, Nina, Rongrong Pan, Lina Ji, Dechen Jiang, and Hong-Yuan Chen. "Photoelectrochemical analysis of the alkaline phosphatase activity in single living cells." Analyst 146, no. 18 (2021): 5528–32. http://dx.doi.org/10.1039/d1an01273h.

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19

Molaei, M., M. Marandi, E. Saievar-Iranizad, N. Taghavinia, B. Liu, H. D. Sun, and X. W. Sun. "Near-white emitting QD-LED based on hydrophilic CdS nanocrystals." Journal of Luminescence 132, no. 2 (February 2012): 467–73. http://dx.doi.org/10.1016/j.jlumin.2011.08.038.

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20

Wang, Jing, Meng Ma, Rongbin Huang, Ligeng Wang, Aimin Chen, and Jun Hu. "An efficient ratiometric fluorescent probe based on dual-emission fluorescent silica nanoparticles for visual determination of Hg2+." Analytical Methods 7, no. 6 (2015): 2295–99. http://dx.doi.org/10.1039/c4ay02905d.

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21

Naberezhnykh, G., A. Sergeev, and O. Novikova. "QUANTUM DOTS OF CADMIUM SULFIDE PRODUCED WITH THE USE OF PROTEINS-PORINS, CARRAGEANANS, CHITOSANS AND LIPOPOLOSACCHARIDES." Russian Journal of Biological Physics and Chemisrty 7, no. 3 (September 28, 2022): 428–33. http://dx.doi.org/10.29039/rusjbpc.2022.0539.

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Quantum dots (QDs) are a new generation of fluorochromes with significant advantages over traditional organic dyes. QDs based on CdS are promising materials for optics, optoelectronics, biology, and medicine. QDs in the form of colloidal solutions are of great scientific and practical interest. CdS quantum dots were synthesized by chemical condensation in an aqueous solution using Yersinia pseudotuberculosis porin proteins, positively (chitosan) and negatively (carrageenan, lipopolysaccharide) charged polysaccharides. The maxima of the emission spectra for all samples were 450 nm, which indicates the same QD size; is determined by the size of the "cells" of the grid matrix, which limit the size of the QD. It was shown that the fluorescence intensity of QDs synthesized in LPS solutions was two times higher than that of other samples. The fluorescence of the samples and the maxima of the emission spectra (450 nm) are preserved during intensive dialysis against buffers, which indicates the stability of QDs and the possibility of using the obtained labeled preparations. Keeping samples at pH 3 leads to a significant decrease in fluorescence, especially for acidic polysaccharides. Anionic oxygen of phosphate, hydroxyl groups of sugar, nitrogen atoms can interact with metal ions, which are precursors (precursors) for CdS nanocrystals. It was found that the interaction with porin-specific IgG leads to a significant change in the luminescence intensity of QD-porin samples. This is of interest from the point of view of chemical sensing and opens the prospect of using QD-labeled porin-based nanostructures as biosensors.

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22

Mahle, Reddhy, Partha Kumbhakar, Ashim Pramanik, Pathik Kumbhakar, Sumita Sahoo, Rabibrata Mukherjee, Chandra Sekhar Tiwary, and Rintu Banerjee. "Probing the bacterial detoxification of cadmium to form cadmium sulfide quantum dots and the underlying mechanism." Materials Advances 1, no. 5 (2020): 1168–75. http://dx.doi.org/10.1039/d0ma00105h.

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23

Lin, Xin, Shao-Hai Li, Kang-Qiang Lu, Zi-Rong Tang, and Yi-Jun Xu. "Constructing film composites of silicon nanowires@CdS quantum dot arrays with ameliorated photocatalytic performance." New Journal of Chemistry 42, no. 17 (2018): 14096–103. http://dx.doi.org/10.1039/c8nj02883d.

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24

Жуков, Н. Д., И. Т. Ягудин, Н. П. Абаньшин, and Д. С. Мосияш. "Исследование квантовых точек в мультизеренном слое планарно-торцевой микроструктуры." Письма в журнал технической физики 46, no. 21 (2020): 40. http://dx.doi.org/10.21883/pjtf.2020.21.50196.18392.

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Quantum dots (QDs) of Cds, PbS, and InSb semiconductors in a multi-grain layer of planar-edge microstructure were studied. A model of the ordered arrangement of CT in the micro-gap structure and the flow of current along the lines of parallel arrangement of QD is proposed. Electronic transport at low voltage values (less than 8 V) is determined by thermal and tunnel emission from the QD into the gap, at high values - by the charge restriction in the QD according to the Coulomb block model. A strong influence of IR and UV radiation on the VAC was found.

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Zhang, Junyu, Fang-Xing Xiao, Guangcan Xiao, and Bin Liu. "Assembly of a CdS quantum dot–TiO2 nanobelt heterostructure for photocatalytic application: towards an efficient visible light photocatalyst via facile surface charge tuning." New Journal of Chemistry 39, no. 1 (2015): 279–86. http://dx.doi.org/10.1039/c4nj01346h.

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CdS QD sensitized TiO₂ nanobelt nanostructures were fabricated by a facile self-assembly approach and the photocatalytic performance of the well-defined hybrid heterostructure was systematically probed.

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Lodhi, Madeeha Shahzad, and Zahoor Qadir Samra. "Engineering Quantum Dot (Cadmium Sulfide) on Antibodies for Fluoroimmunoassays." Journal of Nanomaterials 2020 (April 21, 2020): 1–12. http://dx.doi.org/10.1155/2020/4707123.

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Antibodies are good escorts for a therapeutic and diagnostic tool against many diseases as well as for targeting drug delivery and in immunohistochemistry. Cysteine-capped cadmium sulfide (quantum dot) nanoparticles have wide applications in immunohistochemistry due to their unique physical, chemical, and fluorescent properties. In this study, polyclonal antibodies against transferrin (as ligand), doxorubicin (anticancer drug), and H. pylori (cancer-causing agent) were developed in rabbits and purified. Purified antibodies were labeled with cadmium sulfide (CdS) quantum dot (QD) and used as a fluorescent-labeled marker for one-step identification in diagnosis and therapeutics. Cysteine-capped CdS QDs were synthesized in the presence of taurine (antioxidant) and characterized by FTIR, VSM, DLS, and TEM. CdS nanoparticles are monodisperse with a narrow size range below 7 nm and showed an increase of almost 30 nm after conjugation to IgG. The binding of QD-labeled antibodies was observed and confirmed by binding on MDA-MB 231 cancer cells, mouse liver tissue, mouse tumor tissue, and H. pylori under a fluorescent microscope. QD-labeled antibodies gave sharp fluorescence after binding with their respective targets. Intensity of fluorescence with quantum dot enhances many folds as compared to that of traditional fluorescent-labeled compounds. Experiments are underway to target transferrin and doxorubicin and to analyze the role of H. pylori in a mouse model of gastric cancer.

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Zolotarev, Konstantin V., Valentina N. Kashirtseva, Alexey V. Mishin, Natalya F. Belyaeva, Natalya V. Medvedeva, and Olga M. Ipatova. "Assessment of Toxicity of Cdse/Cds/Zns/S,S-Dihydrolipoic Acid/Polyacrylic Acid Quantum Dots at Danio rerio Embryos and Larvae." ISRN Nanotechnology 2012 (July 9, 2012): 1–5. http://dx.doi.org/10.5402/2012/914636.

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Quantum dots (QDs) are nanosized semiconductor crystals. They are currently applied in different science fields such as medicine, namely, cancer diagnostics and treatment. QD toxicity is caused by the toxicity of their components. In vivo application of QDs requires their toxicity assessment, so the purpose of this work has been the estimation of acute and chronic toxicity of the QDs at Danio rerio embryos and larvae, QDs being composed of CdSe/CdS/ZnS/S,S-dihydrolipoic acid/polyacrylic acid. We have found no QD acute toxicity during 48 hours of QDs action at the embryo up to the concentration of 185 μM Cd. QDs have been found to be toxic only at 5–7 days of action, it shows that QDs act accumulatively. Beside lethality, we have observed different larval development defects, that is, differently localized edemas, lag of development, tail curvature, and swimming bladder malformation. Our experimental data as well as literature data show that toxicity of the quantum dots at Danio rerio embryos and larvae is primarily caused by toxic action of Cd2+ ion which arises from partial dissociation of CdSe and CdS molecules.

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Gallo, Valentina, Vaibhav Srivastava, Vincent Bulone, Andrea Zappettini, Marco Villani, Nelson Marmiroli, and Marta Marmiroli. "Proteomic Analysis Identifies Markers of Exposure to Cadmium Sulphide Quantum Dots (CdS QDs)." Nanomaterials 10, no. 6 (June 22, 2020): 1214. http://dx.doi.org/10.3390/nano10061214.

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The use of cadmium sulphide quantum dot (CdS QD)-enabled products has become increasingly widespread. The prospect of their release in the environment is raising concerns. Here we have used the yeast model Saccharomyces cerevisiae to determine the potential impact of CdS QD nanoparticles on living organisms. Proteomic analyses and cell viability assays performed after 9 h exposure revealed expression of proteins involved in oxidative stress and reduced lethality, respectively, whereas oxidative stress declined, and lethality increased after 24 h incubation in the presence of CdS QDs. Quantitative proteomics using the iTRAQ approach (isobaric tags for relative and absolute quantitation) revealed that key proteins involved in essential biological pathways were differentially regulated over the time course of the experiment. At 9 h, most of the glycolytic functions increased, and the abundance of the number of heat shock proteins increased. This contrasts with the situation at 24 h where glycolytic functions, some heat shock proteins as well as oxidative phosphorylation and ATP synthesis were down-regulated. It can be concluded from our data that cell exposure to CdS QDs provokes a metabolic shift from respiration to fermentation, comparable to the situation reported in some cancer cell lines.

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Chashchikhin, Oleg V., and Mikhail F. Budyka. "Spectral and photochemical properties of hybrid organic–inorganic nanosystems based on CdS quantum dots and merocyanine ligands." Photochemical & Photobiological Sciences 16, no. 8 (2017): 1252–59. http://dx.doi.org/10.1039/c7pp00137a.

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Quantum dot/photochrome (QD/PC) hybrid photolysis was investigated. PC photoisomerization was suppressed in hybrid. Upon hybrid photolysis by visible light with energy higher than threshold, photosensitized destruction of QDs (which did not absorb light) occurred. The effects were attributed to PC adsorption on QD surface.

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30

He, Zhang-Jin, Tian-Fang Kang, Li-Ping Lu, and Shui-Yuan Cheng. "An electrochemiluminescence sensor based on CdSe@CdS-functionalized MoS2 and a GOD-labeled DNA probe for the sensitive detection of Hg(ii)." Analytical Methods 12, no. 4 (2020): 491–98. http://dx.doi.org/10.1039/c9ay02524c.

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In this study, a novel electrochemiluminescence (ECL) biosensor based on a CdSe@CdS quantum dot (QD)-functionalized MoS₂-modified electrode was developed for the sensitive detection of mercury ions.

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31

Wang, Kanghong, Xin Tong, Yufeng Zhou, Hui Zhang, Fabiola Navarro-Pardo, Gurpreet S. Selopal, Guiju Liu, et al. "Efficient solar-driven hydrogen generation using colloidal heterostructured quantum dots." Journal of Materials Chemistry A 7, no. 23 (2019): 14079–88. http://dx.doi.org/10.1039/c9ta03026c.

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Here, we report a CdSe/CdSeS alloy/CdS core/shell/shell QD sensitized mesoporous TiO₂ photoanode, which exhibits high performance and long-term stability for solar-driven hydrogen generation.

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ZHONG, QING-HU, and XUE-HUA YI. "WELL WIDTH-DEPENDENT ELECTRON RAMAN SCATTERING IN A SPHERICAL QUANTUM DOT." Modern Physics Letters B 24, no. 06 (March 10, 2010): 585–93. http://dx.doi.org/10.1142/s0217984910022640.

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Electron Raman scattering (ERS) is investigated in a CdS cylindrical spherical dot (QD). The different cross-section (DCS) is calculated as a function of the scattering frequency and the size of QD. Single parabolic conduction and valence bands are assumed. Singularities in the spectrum are found and interpreted. The selection rules for the processes are also studied. The ERS studied here can be used to provide direct information about the electron band structure of these systems.

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Chung, Yueh-Chi, Chien-Hsin Yang, Hao-Wen Zheng, Ping-Szu Tsai, and Tzong-Liu Wang. "Synthesis and characterization of CdSxSe1−xalloy quantum dots with composition-dependent band gaps and paramagnetic properties." RSC Advances 8, no. 52 (2018): 30002–11. http://dx.doi.org/10.1039/c8ra06007j.

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Ju, Yun, Xin Hu, Yang Zang, Rong Cao, and Huaiguo Xue. "Amplified photoelectrochemical DNA biosensor based on a CdS quantum dot/WS2 nanosheet heterojunction and hybridization chain reaction-mediated enzymatic hydrolysis." Analytical Methods 11, no. 16 (2019): 2163–69. http://dx.doi.org/10.1039/c9ay00166b.

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An amplified photoelectrochemical biosensor was designed for the ultrasensitive monitoring of DNA by coupling a CdS quantum dot (QD)/WS₂ nanosheet heterostructure with hybridization chain reaction (HCR)-programmed enzymatic hydrolysis.

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35

Tsuboi, Setsuko, and Takashi Jin. "BRET based dual-colour (visible/near-infrared) molecular imaging using a quantum dot/EGFP–luciferase conjugate." RSC Advances 9, no. 60 (2019): 34964–71. http://dx.doi.org/10.1039/c9ra07011g.

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A bioluminescent dual-colour molecular-imaging probe was prepared to emit green and near-infrared luminescence from a conjugate between enhanced green fluorescent protein (EGFP), Renilla luciferase (RLuc) and CdSeTe/CdS quantum dot (QD).

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Dong, Limin, Shuai Wang, Le Chen, and Xinxin Jin. "CdS QD-CQD co-sensitized TiO2solar cells: preparation and photoelectrochemical properties." Materials Technology 34, no. 2 (October 8, 2018): 59–67. http://dx.doi.org/10.1080/10667857.2018.1529724.

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Abdullah, Manal Midhat, and Omar Adnan Ibrahim. "CdSe/CdS Quantum Dot Core-Shell for Silicon Solar Cell Efficiency Enhancement." Nano Hybrids and Composites 29 (June 2020): 8–14. http://dx.doi.org/10.4028/www.scientific.net/nhc.29.8.

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Core-shell nanocrystals are utilized to improve vitality conversion efficiency of Si based solar cells. In the present work, a study of synthesis and characterization of photo luminescent, down-shifting, core-shell CdSe/CdS quantum dots is introduced. The QD,s absorb in the UV range (350nm) of the solar spectrum and emit photons with wavelengths centered at (574 nm). Calculated energy gap is (2.16 eV), which is well suited for Silicon absorption and electron-hole pair generation. The grain size is ranged between (1.814 and 3.456 nm). Results show that the cell efficiency is improved from (8.81%) (For a reference silicon solar cell) to (10.07%) (For a CdSe/CdS QD deposited directly on the surface of the solar cell). This improvement is referred to the spreading of the absorbed solar radiation over the spectral response of the Si solar cell.

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Huu, Phuc Dang, and Phan Xuan Le. "Thermodynamic properties in quantum dot nanocomposite for white light-emitted diodes." Indonesian Journal of Electrical Engineering and Computer Science 27, no. 2 (August 1, 2022): 632. http://dx.doi.org/10.11591/ijeecs.v27.i2.pp632-637.

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For a <span>colour conversion substance, we developed a new nanocomposite containing a CdSe/CdS/ZnS red-emitted quantum dot (QD), a green-emittedd <span>Sr<sub>2</sub>SiO<sub>4</sub>:Eu </span>phosphorus, and silicon resins. Regarding QD concentration and ingredients, the heat increase and optic features of the nanocomposite attributable to the QD inclusion were examined. According to the findings, a modest portion of QDs added to a photon converter at the emission wavelength of QD produced a considerable degree of heat. We used 0.2 wt% QDs over an InGaN blue-emitting light-emitted diodes (LED) chip to simulate a thermal increase in a nanocomposite. Consequently, we were able to produce a white-emitted LED module featuring a good 83.2 colour rendered index, an excellent 65.86 lm W-1 brightness, and a reasonable 94 °C thermal rise. The recently founded QD-phosphorus nanocomposite transformed white-emitted LED offers a lot of possibility of modern lighting.</span>

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Suwatthanarak, Thanawat, Masayoshi Tanaka, Taisuke Minamide, Andrew J. Harvie, Abiral Tamang, Kevin Critchley, Stephen D. Evans, and Mina Okochi. "Screening and characterisation of CdTe/CdS quantum dot-binding peptides for material surface functionalisation." RSC Advances 10, no. 14 (2020): 8218–23. http://dx.doi.org/10.1039/d0ra00460j.

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Liu, Guiju, Haiguang Zhao, Feiyu Diao, Zhibin Ling, and Yiqian Wang. "Stable tandem luminescent solar concentrators based on CdSe/CdS quantum dots and carbon dots." Journal of Materials Chemistry C 6, no. 37 (2018): 10059–66. http://dx.doi.org/10.1039/c8tc02532k.

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Xu, Tao. "CdSe/CdS QD-LEDs Fabricated Using a Thermally Polymerized Hole-Transport Layer." MRS Bulletin 31, no. 4 (April 2006): 290. http://dx.doi.org/10.1557/mrs2006.81.

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Huang, Huai Qing, Jin Ling Liu, Bao Fu Han, and Shu Kun Xu. "Aqueous Synthesis of Highly Luminescent CdTe/CdS/ZnS Core-Shell-Shell Quantum Dots with Biocompatibility." Advanced Materials Research 287-290 (July 2011): 348–51. http://dx.doi.org/10.4028/www.scientific.net/amr.287-290.348.

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CdTe/CdS/ZnS core-shell-shell (CSS) quantum dots (QDs) were synthesized in aqueous solution via water-bathing combined hydrothermal method using L-cysteine (L-Cys) as a stabilizer. This method possesses both the advantages of water-bathing and hydrothermal methods, and thus can prepare CSS QDs with markedly reduced synthesis time than previously reported methods. The as-prepared QDs display a higher fluorescent intensity than bare CdTe or CdTe/CdS. After co-cultured with yeast at different growth phase, the as-prepared L-Cys capped CdTe/CdS/ZnS QDs showed much less toxicity than the other CdTe or CdTe/CdS QDs. Our results demonstrate that the CSS QD would have a promising potential in fields of bio-labeling and cell imaging.

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43

Assim Ahmed Issa and Tamathir Abbas Hamoudi. "Theoretical Studies of the Optical Properties of ZnS , ZnO and CdS Nanopartical Using the Brus Equation." Tikrit Journal of Pure Science 27, no. 3 (November 30, 2022): 15–18. http://dx.doi.org/10.25130/tjps.v27i3.55.

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In the present work, Brus equation has been used to study the size effect of the quantum dot on the optical properties of some semiconductor compounds ( CdS, ZnS and ZnO). It is found that the absorption wavelength and bandgap energy are dependent on the size of the QD. As the size of the QD decreases, the bandgap energy increases and the absorption wavelength decreases. There is good agreement of the theoretical results of the bandgap energy and absorption wavelength obtained in this study using Brus equation with the published experimental results for the semiconductor compounds mentioned above.

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Sanchez, Rafael S., Mauricio Solis de la Fuente, Isaac Suarez, Guillermo Muñoz-Matutano, Juan P. Martinez-Pastor, and Ivan Mora-Sero. "Tunable light emission by exciplex state formation between hybrid halide perovskite and core/shell quantum dots: Implications in advanced LEDs and photovoltaics." Science Advances 2, no. 1 (January 2016): e1501104. http://dx.doi.org/10.1126/sciadv.1501104.

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We report the first observation of exciplex state electroluminescence due to carrier injection between the hybrid lead halide perovskite (MAPbI3–xClx) and quantum dots (core/shell PbS/CdS). Single layers of perovskite (PS) and quantum dots (QDs) have been produced by solution processing methods, and their photoluminescent properties are compared to those of bilayer samples in both PS/QD and QD/PS configurations. Exciplex emission at lower energies than the band gap of both PS and QD has been detected. The exciplex emission wavelength of this mixed system can be simply tuned by controlling the QD size. Light-emitting diodes (LEDs) have been fabricated using those configurations, which provide light emission with considerably low turn-on potential. The “color” of the LED can also be tuned by controlling the applied bias. The presence of the exciplex state PS and QDs opens up a broad range of possibilities with important implications not only in tunable LEDs but also in the preparation of intermediate band gap photovoltaic devices with the potentiality of surpassing the Shockley-Queisser limit.

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Skobeeva, V. M., V. A. Smyntyna, M. I. Kiose, and N. V. Malushin. "INCREASING THE PHOTOLUMINESCENCE EFFICIENCY OF CdS NC GROWN IN A GELATINOUS ENVIRONMENT." Sensor Electronics and Microsystem Technologies 18, no. 1 (March 31, 2021): 10–19. http://dx.doi.org/10.18524/1815-7459.2021.1.227406.

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The optical and luminescent properties of nanostructures of CdS / ZnS QDs and CdS QDs doped with lithium, obtained by the sol-gel technology in an aqueous solution of gelatin, have been studied. It was determined from the optical absorption spectra of the CdS / ZnS QD nanostructures that the thickness of the shell layer corresponds to the thickness of one ZnS monolayer. The luminescence spectra revealed a significant increase in the intensity of luminescence nanostructure. The absorption spectra of undoped and doped CdS NCs coincide, which indicates that there is no change in the NC size and the absence of the formation of a lithium-sulfur compound. The luminescence spectra of lithium-doped QDs demonstrate an increase in the luminescence intensity, which is associated with the passivation of surface states.

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46

Huang, Zongbo, and Xiaoping Zou. "Superior Photocurrent of Quantum Dot Sensitized Solar Cells Based on PbS : In/CdS Quantum Dots." International Journal of Photoenergy 2015 (2015): 1–9. http://dx.doi.org/10.1155/2015/657871.

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PbS : In and CdS quantum dots (QDs) are sequentially assembled onto a nanocrystalline TiO2film to prepare a PbS : In/CdS cosensitized photoelectrode for QD sensitized solar cells (QDSCs). The results show that PbS : In/CdS QDs have exhibited a significant effect in the light harvest and performance of the QDSC. In the cascade structure of the electrode, the reorganization of energy levels between PbS and TiO2forms a stepwise structure of band-edge levels which is advantageous to the electron injection into TiO2. Energy conversion efficiency of 2.3% is achieved with the doped electrode, under the illumination of one sun (AM1.5, 100 mW cm2). Besides, a remarkable short circuit current density (up to 23 mA·cm−2) is achieved in the resulting PbS : In/CdS quantum dot sensitized solar cell, and the related mechanism is discussed.

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Sun, Qianqian, Zebin Yu, Ronghua Jiang, Yanping Hou, Lei Sun, Lun Qian, Fengyuan Li, Mingjie Li, Qi Ran, and Heqing Zhang. "CoP QD anchored carbon skeleton modified CdS nanorods as a co-catalyst for photocatalytic hydrogen production." Nanoscale 12, no. 37 (2020): 19203–12. http://dx.doi.org/10.1039/d0nr05268j.

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48

Smyntyna, V. A., V. M. Skobeeva, K. A. Verheles, and M. V. Malushin. "Influence of Organic Molecules on the Luminescent Properties of Composites Based on CdS Quantum Dots." Фізика і хімія твердого тіла 18, no. 4 (December 27, 2017): 426–30. http://dx.doi.org/10.15330/pcss.18.4.430.

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The influence of methylene blue (MB) and acridine yellow (AY) dyes on the spectra of luminescence of CdS with quantum dots (QD) dye composites is investigated. It is shown that the luminescence spectrum of the heterosystem of nanocrystals (NC) CdS – the dye depends on the absorption region of it. The spectrum of the luminescence of the quantum dots is shifted to the red region by the introduction into the colloidal solution of the MB dye and in a case of the insertion of AY the spectrum is shifted into the blue region. The obtained results are explained in a point of view of the transferring the energy from the CdS quantum dots to the dyes by the Forster mechanism.

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Sun, Yonglei, Yongchen Wang, Hua Zhu, Na Jin, Adnan Mohammad, Necmi Biyikli, Ou Chen, Kun Chen, and Jing Zhao. "Excitation wavelength-dependent photoluminescence decay of single quantum dots near plasmonic gold nanoparticles." Journal of Chemical Physics 156, no. 15 (April 21, 2022): 154701. http://dx.doi.org/10.1063/5.0089090.

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Changing the excitation wavelength is a simple but effective strategy to modulate the photophysical cha racteristics of colloidal quantum dots (QDs) near plasmonic nanostructures. It has been observed that the photoluminescence (PL) decay of QDs near plasmonic nanostructures differs when the excitation wavelength is varied, but the exact mechanism is still unclear today. Here, we studied the excitation wavelength dependence of the PL decay of CdSe/CdS core/shell QDs near plasmonic gold nanoparticles at the single QD level. With the aid of statistical science, we demonstrated that the PL decay of a single QD near gold nanoparticles is generally faster when the QD is excited spectrally close to the localized surface plasmon resonance of gold nanoparticles. This excitation wavelength dependence is mainly caused by the varied proportion of photons coming from biexciton emission, which is the result of different local electric field enhancement by gold nanoparticles upon excitation.

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Yin, Yuan, Qingliang Yang, and Gang Liu. "Ammonium Pyrrolidine Dithiocarbamate-Modified CdTe/CdS Quantum Dots as a Turn-on Fluorescent Sensor for Detection of Trace Cadmium Ions." Sensors 20, no. 1 (January 6, 2020): 312. http://dx.doi.org/10.3390/s20010312.

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In this work, ammonium pyrrolidine dithiocarbamate (APDC) was used as a surface etchant to modify CdTe/CdS core-shell quantum dots (QDs). The APDC etchant combines with the cadmium ions (Cd2+) on the surface of the QDs, resulting in the formation of surface holes. The formation of these holes changes the QD surface structure, which leads to fluorescence quenching of the QDs. Newly added Cd2+ can selectively recognize and combine with these holes; thus, the fluorescence intensity of the QDs can be restored. The linear response of this turn-on fluorescent sensor was found to be 0–100 μg/L and 100–600 μg/L under the determined optimal conditions, and its limit of detection (LOD) for Cd2+ was 2.642 μg/L (23.5 nmol/L).

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