Relevant bibliographies by topics / CdS QD

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  2. Dissertations / Theses
  3. Conference papers

Academic literature on the topic 'CdS QD'

Author: Grafiati
Published: 6 September 2023

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Journal articles on the topic "CdS QD"

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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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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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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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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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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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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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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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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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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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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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Dissertations / Theses on the topic "CdS QD"

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Quaid, Padraic Joseph. "Synthesis of novel chemical adjuvants for the modulation and study of CD1-d mediated immunological processes." Thesis, University of Birmingham, 2017. http://etheses.bham.ac.uk//id/eprint/7861/.

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Presentation of antigens via cell-surface glycoproteins, such as MHC-I and CD1d, elicits an immune response. Antigen loading occurs in the endoplasmic reticulum with the help of chaperone proteins such as calreticulin. It has been shown that a Glc\(_1\)Man\(_3\) tetrasaccharide can be recognised. A biotinylated Glc\(_1\)Man\(_3\) was designed to bind to both calreticulin and streptavidin to allow isolation of the calreticulin–tetrasaccharide complex through pull-down experiments. The stereoselective synthesis of this biotinylated oligosaccharide is described. -galactosyl ceramide is the prototypical ligand of CD1d, its activation of iNKT cells produces a mixture of T\(_H\)1 and T\(_H\)2 cytokines, which limits its therapeutic application. Analogues that induce a biased cytokine response are therefore desirable. Analysis of the crystal structure of the CD1d–-GalCer–TCR complex reveals that the 6-OH and ring oxygen are not involved in binding. Analogues where these parts of the molecule have been excised, have led to the introduction of ThrCer and its cyclitol analogue ThrCer-6. We report a new and improved synthesis of ThrCer-6 and a series of analogues that were designed to elicit biased cytokine responses. Studies towards the preparation of ThrCer analogues involving modifications to the pseudo-glycosidic linkage are also described. Finally, the synthesis of ceramide analogues with the potential for conjugation through a photoreactive group to the CD1d protein are discussed.
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Mukherjee, Arpita. "A Study of Dissipative Phenomena in Semiconductor Nanocrystals." Thesis, 2020. https://etd.iisc.ac.in/handle/2005/5075.

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Quantum dots (QDs) are semiconductor nanoparticles, where carriers are confined in regions smaller than a few tens of nanometers. The physics governing the behavior of these nano structures are fundamentally different from their bulk counterpart. This thesis studies the dissipative phenomena in QDs. In chapter 1, I give a brief introduction of QDs and their carrier dissipation dynamics. In chapter 2, I show that in CuInS2/CdS QDs, the spontaneous emission (SE) lifetime evolves from 46 ns to ~ 300 ns over a 15 ps time scale due to the collapse of the hole to the intragap states through dissipation. This is also observed in other chalcopyrite QDs. The results are obtained employing upconversion photoluminescence (UPL) measurements. In chapter 3, I try to understand the dissipation dynamics in chalcopyrite QDs by theoretical modelling. The study confirms the ultrafast hole localization in the system due to strong electron-phonon coupling as observed experimentally. However, the system possesses a very high defect-assisted SE lifetime which suggests that along with the vibrational coupling, fine-structure participation also needs to be considered which arises due to the involvement of copper d-orbitals to the valence band of the QDs. In chapter 4, I try to regulate dissipation through controlling SE rate by activating alternative radiative channels. For that, I consider CuCdZnSe QD alloys. From the UPL measurement, I find that this scheme enables us to tune SE lifetimes by three orders of magnitude, from ~ 15 ns to over ~ 7 μs. In chapter 5, I probe the ultrafast carrier dynamics of CuAlS2/ZnS QDs, which directly convert aqueous solutions of bicarbonate ions to formate with remarkable efficiency (~ 20 %). Here I show that it is essentially dominated by ultrafast electron transfer (560 fs) to the surface. In addition, I observe that the electron dwell time in the conduction band increases with the excitation fluence which is reverse of the auger recombination. I further investigate this system through two-pump transient absorption which show that the electron dynamics are governed by the temporal evolution of the hole wave function. In chapter 6, I utilize the dissipation in QDs and build all-optical switching and all-optical logic gates implementing microbubble. The experiments are done using low power continuous-wave laser. In conclusion, I have studied the carrier dissipation dynamics in QDs and built all-optical switching and universal all-optical logic gates which paves the way for the design of photonic circuits.
Indian Institute of Science
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Rekha, M. "Study of Charge Separation in Quantum Dots and Their Assemblies." Thesis, 2017. http://etd.iisc.ac.in/handle/2005/3716.

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This thesis reports a passive method for Fermi level regulation in quantum dot assemblies through ground state transfer between QDs. Here, ZnTe/CdS, and PbSe/CdSe core/shell QDs were used as valence band electron donors, while Cu containing CdS or ZnSe acts as electron acceptor QDs. Prior to study of ground state charge transfer process, this report discusses the synthesis of ZnTe/CdS, and PbSe/CdSe core shell QDs, which are later used to study charge transfer. Since ZnTe QDs are unstable and prone to oxidation, a CdS coated ZnTe QDs were used. Growing a CdS shell on ZnTe core is difficult because high reduction potential of Te. To overcome this problem, partially reduced sulphur is used for the synthesis of ZnTe/CdS. The peculiar optical properties exhibited by ZnTe/CdS also have been discussed. Even though the synthesis of Lead chalcogenide nanoparticles has been investigated previously, certain inconsistencies between the behavior expected from known mechanisms and empirical observations. An anion exchange mechanism is proposed and demonstrated to be involved in PbSe formation. Both ZnTe and PbSe based QDs are extensively used to study hole injection and copper containing QDs were used as acceptors. The charge transfer has been studied using optical spectroscopy. The structure and composition of the assemblies was identified using powder crystallography, electron-microscopy and composition analysis. The unique physical and chemical properties of these materials are exciting both fundamentally as well as from the point of view of applications.
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Rekha, M. "Study of Charge Separation in Quantum Dots and Their Assemblies." Thesis, 2017. http://etd.iisc.ernet.in/2005/3716.

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This thesis reports a passive method for Fermi level regulation in quantum dot assemblies through ground state transfer between QDs. Here, ZnTe/CdS, and PbSe/CdSe core/shell QDs were used as valence band electron donors, while Cu containing CdS or ZnSe acts as electron acceptor QDs. Prior to study of ground state charge transfer process, this report discusses the synthesis of ZnTe/CdS, and PbSe/CdSe core shell QDs, which are later used to study charge transfer. Since ZnTe QDs are unstable and prone to oxidation, a CdS coated ZnTe QDs were used. Growing a CdS shell on ZnTe core is difficult because high reduction potential of Te. To overcome this problem, partially reduced sulphur is used for the synthesis of ZnTe/CdS. The peculiar optical properties exhibited by ZnTe/CdS also have been discussed. Even though the synthesis of Lead chalcogenide nanoparticles has been investigated previously, certain inconsistencies between the behavior expected from known mechanisms and empirical observations. An anion exchange mechanism is proposed and demonstrated to be involved in PbSe formation. Both ZnTe and PbSe based QDs are extensively used to study hole injection and copper containing QDs were used as acceptors. The charge transfer has been studied using optical spectroscopy. The structure and composition of the assemblies was identified using powder crystallography, electron-microscopy and composition analysis. The unique physical and chemical properties of these materials are exciting both fundamentally as well as from the point of view of applications.
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Денисюк, Р. О. "Взаємодія твердих розчинів Cd1-xMnxTe з іодвмісними (І2 — метанол, І2 — диметилформамід) та іодвиділяючими (Н2О2–НІ–розчинник) травильними композиціями." Thesis, 2009. http://eprints.zu.edu.ua/17764/1/dys_Denysjuk.pdf.

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Conference papers on the topic "CdS QD"

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Elsinger, Lukas, Dries Van Thourhout, Iman E. Zadeh, Jorick Maes, Antonio Guardiani, Ronan Gourgues, Silvania F. Pereira, et al. "Plasmonic Enhancement and Spectroscopy of PbS/CdS QD Emitters on a Silicon Nitride Photonic Platform." In Internet Conference for Quantum Dots. València: Fundació Scito, 2020. http://dx.doi.org/10.29363/nanoge.icqd.2020.103.

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Zvaigzne, Mariya A., Alexey Alexandrov, and Pavel Samokhvalov. "The crucial role of surface ligands on the properties of thin CdSe/ZnS/CdS/ZnS QD-films for QDLEDs." In IV International Conference on Applications of Optics and Photonics, edited by Manuel Filipe P. Martins Costa. SPIE, 2019. http://dx.doi.org/10.1117/12.2530255.

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Xie, Yijing, Shaoshuai Mou, and Shreyas Sundaram. "Towards Resilience for Multi-Agent QD-Learning." In 2021 60th IEEE Conference on Decision and Control (CDC). IEEE, 2021. http://dx.doi.org/10.1109/cdc45484.2021.9683145.

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