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Journal articles on the topic 'CdSe/CdS'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Viet Ha, Chu, Hoang Thi Hang, Nguyen Thi Bich Ngoc, Ngo Thi Huong, Vu Thi Kim Lien, and Tran Hong Nhung. "SYNTHESIS OF CdSe/CdS AND CdSe/CdS/SiO2 NANOPARTICLES VIA WET CHEMICAL METHOD." Journal of Science, Natural Science 60, no. 7 (2015): 75–80. http://dx.doi.org/10.18173/2354-1059.2015-0035.

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2

Tian, Yongchi, Theresa Newton, Nicholas A. Kotov, Dirk M. Guldi, and Janos H. Fendler. "Coupled Composite CdS−CdSe and Core−Shell Types of (CdS)CdSe and (CdSe)CdS Nanoparticles." Journal of Physical Chemistry 100, no. 21 (January 1996): 8927–39. http://dx.doi.org/10.1021/jp951965l.

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3

Patra, S. R., and B. Mallick. "Effect of Nanostructure CdSe/CdS Dot-in-Rods Coated on Flexible Cellulosic Substrate to Improve Photoluminescence Potential of Conducting Fiber." Sensor Letters 18, no. 3 (March 1, 2020): 216–21. http://dx.doi.org/10.1166/sl.2020.4209.

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The work presented here, the flash synthesis of high photoluminescence of CdSe/CdS Dot-in-Rods was carried out by "high-temperature short-time" (HTST) processing technique of quantum yield being 77%. Upon characterization by transmission electron microscope (TEM), it is found to be the dimensions of CdSe-CdS QDs to be rods (rod length rod diameter) of 27.8 × 3.4 nm. A layer of high luminescence CdSe/CdS Dot-in-Rods was grown on the surface of the touch sensitive natural Mimosa pudica (MP) natural conducting fiber by chemical dipping method. The composite CdSe/CdS are made up of a CdSe spherical core (Dot) of average diameter about 2.9 nm embedded in a Rod of CdS shell. The well-oriented CdSe/CdS Dot-in-Rods nano-particle was observed to have an emission peak at 545 nm. The works suggest a sensing plate which enhances Photoluminescence potential of conducting natural fiber.

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4

Talapin, Dmitri V., Elena V. Shevchenko, Christopher B. Murray, Andreas Kornowski, Stephan Förster, and Horst Weller. "CdSe and CdSe/CdS Nanorod Solids." Journal of the American Chemical Society 126, no. 40 (October 2004): 12984–88. http://dx.doi.org/10.1021/ja046727v.

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5

LEE, JU YOUNG, YOUNG SOO KANG, and YONG JOO KIM. "A STUDY ON A NEW SYNTHETIC METHOD OF CdS AND CdSe NANOPARTICLES AND THEIR ORGANIC/INORGANIC NANOCOMPOSITE." International Journal of Nanoscience 01, no. 05n06 (October 2002): 501–5. http://dx.doi.org/10.1142/s0219581x02000577.

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Materials such as CdS and CdSe inorganic nanoparticles have photoluminescence. Sodium oleate has been used as effective stabilizers for the synthesis of CdS and CdSe nanoparticles in water by autoclave method. Photoluminescence of CdS and CdSe with particle size of 5–14 nm showed λ max at 520 nm and 600 nm, respectively, when were excited at 365 nm. These nanoparticles doped into the PVA resulted in the organic/inorganic films ( PVA/CdS , CdSe ). Photoluminescence, X-ray diffraction and transmission electron microscopy were employed for their characterization.

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6

Molaei, M., F. Salari Bardsiri, A. R. Bahador, and M. Karimipour. "One-pot microwave assisted approach for synthesis of CdSe/CdS core-shell quantum dots (QDs) and investigating optical properties." Modern Physics Letters B 30, no. 07 (March 20, 2016): 1650074. http://dx.doi.org/10.1142/s0217984916500743.

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In this work, CdSe QDs were synthesized using a microwave assisted method and chemical reaction between NaHSe, CdSO4 at the presence of TGA as capping molecule. Thereafter without CdSe extraction, CdS shell was grown subsequently around CdSe cores by a reaction based on the heat sensitivity of Na2S2O3 dissociation. Synthesized QDs were characterized by means of X-ray diffraction spectroscopy (XRD), Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), UV–Vis and photoluminescence (PL) spectroscopy. All of these analyzes confirmed formation of CdSe QDs and successfully growth of CdS shell on surface of CdSe to forming CdSe/CdS core-shell structure.

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7

Gadalla, A., M. S. Abd El-Sadek, and R. Hamood. "Synthesis and optical properties of CdSe/CdS core/shell nanocrystals." Materials Science-Poland 37, no. 2 (June 1, 2019): 149–57. http://dx.doi.org/10.2478/msp-2019-0034.

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AbstractThis paper attempts to describe an effective method for producing a composite of quantum dots consisting of CdSe (core) with CdS (shell). This nanoparticles composite was synthesized from modified organometallic precursors. The sizes of the nanoparticles were estimated from X-ray diffraction data using Debye-Scherer formula and compared with high resolution electron microscopy (HRTEM) and optical spectra. The shape of CdSe/CdS NPs is nearly spherical and revels that the CdS shell with the thickness ~0.6 nm almost fully covers the CdSe core (higher contrast). Using UV-Vis spectroscopy, a systematic red shift in the absorption and emission spectra was observed after the deposition of CdS which confirms the shell growth over the CdSe core. In the CdSe/CdS core/shell structure, the holes are confined to the core, while the electrons are delocalized as a result of similar electron affinities of the core and the shell. The increased time of synthesis resulted in shell thickness increase. The observed properties of prepared CdSe/CdS QDs demonstrate the capability of the nanocomposite for using in the optoelectronics and photonics devices.

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8

Dworak, Lars, Sina Roth, and Josef Wachtveitl. "Electron Wave Functions in Heteronano-structures Control the Electron Transfer Dynamics." EPJ Web of Conferences 205 (2019): 05008. http://dx.doi.org/10.1051/epjconf/201920505008.

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Electron transfer dynamics in CdTe/CdSe and CdSe/CdS core/shell heteronanostructures decorated with molecular acceptors are determined via transient absorption spectroscopy. The CdSe shell accelerates the electron transfer whereas the CdS shell leads to a retardation.

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9

Bini, S., and C. Razzetti. "Measurement of clamped electrooptical coefficients in CdS, CdSe, and CdSCdSe." Physica Status Solidi (a) 148, no. 2 (April 16, 1995): 603–9. http://dx.doi.org/10.1002/pssa.2211480229.

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10

Qi, Xiaolei, Xiaoping Zou, and Sheng He. "La Doping of CdS for Enhanced CdS/CdSe Quantum Dot Cosensitized Solar Cells." Journal of Chemistry 2015 (2015): 1–7. http://dx.doi.org/10.1155/2015/710140.

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CdS/CdSe system of quantum dot cosensitized solar cells (QDCSCs) is one of the most attractive structures for high-efficiency due to its effect of level adjusting. However, the stepwise structure formed between levels of CdS and CdSe has a limitation for enhancing the efficiencies. Metal ions doping in quantum dots have emerged as a common way for changing the Fermi level, band gap, and conductance. Here we report an innovative concept for the rare earth materials La-doped of the CdS layer in the CdS/CdSe QDCSCs by means of the successive ionic layer adsorption and reaction (SILAR). Then we tested that La doped quantum dots can help more electrons accumulate in CdS film, which makes the Fermi level shift up and form a stepped structure. This method leads to enhanced absorption intensity, obviously increasing current density in CdS/CdSe QDCSCs. Our research is a new exploration for improving efficiencies of quantum dot sensitized solar cells.

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11

Zhou, Wu Lei, Tuo Cai, Yun Chen, Xuan Lin Chen, Yu Qiu Qu, Xing Bin Huang, Wen Jiang Dai, et al. "Synthesis of CdS-Capped CdSe Nanocrystals without any Poisonous Materials." Advanced Materials Research 981 (July 2014): 806–9. http://dx.doi.org/10.4028/www.scientific.net/amr.981.806.

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CdS-capped CdSe nanocrystals (NCs) which show high luminescence quantum yield are synthesized without any Poisonous Materials in aqueous solution. The synthesis in an aqueous medium without any poisonous materials is attached importance to. The absorption spectroscopy and photoluminescence spectroscopy are employed to analyze the NCs. It takes 78s that the intensity decreases to the half for bare CdSe NCs, but 442s for CdSe/CdS core/shell NCs. The photo stability of CdSe NCs under 325nm laser irradiation is enhanced greatly after CdS overcoating.

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12

Guan, Yingxiang, Xiaoping Zou, and Sheng He. "Effect of CdS/Mg-Doped CdSe Cosensitized Photoanode on Quantum Dot Solar Cells." Journal of Nanomaterials 2015 (2015): 1–6. http://dx.doi.org/10.1155/2015/673135.

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Quantum dots have emerged as a material platform for low-cost high-performance sensitized solar cells. And doping is an effective method to improve the performance of quantum dot sensitized solar cells (QDSSCs). Since Kwak et al. from South Korea proved the incorporation of Mg in the CdSe quantum dots (QDs) in 2007, the Mg-doped CdSe QDs have been thoroughly studied. Here we report a new attempt on CdS/Mg-doped CdSe quantum dot cosensitized solar cells (QDCSSC). We analyzed the performance of CdS/Mg-doped CdSe quantum dot cosensitized solar cells via discussing the different doping concentration of Mg and the different SILAR cycles of CdS. And we studied the mechanism of CdS/Mg-doped CdSe QDs in detail for the reason why the energy conversion efficiency had been promoted. It is a significant instruction on the development of Mg-doped CdSe quantum dot sensitized solar cells (QDSSCs).

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13

Punnoose, Dinah, S. Srinivasa Rao, Soo-Kyoung Kim, and Hee-Je Kim. "Exploring the effect of manganese in lead sulfide quantum dot sensitized solar cell to enhance the photovoltaic performance." RSC Advances 5, no. 42 (2015): 33136–45. http://dx.doi.org/10.1039/c4ra16999a.

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14

Chen, Yujuan, Weishuo Xing, Yixuan Liu, Xinsu Zhang, Yangyang Xie, Chongyu Shen, Jay Guoxu Liu, Chong Geng, and Shu Xu. "Efficient and Stable CdSe/CdS/ZnS Quantum Rods-in-Matrix Assembly for White LED Application." Nanomaterials 10, no. 2 (February 12, 2020): 317. http://dx.doi.org/10.3390/nano10020317.

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CdSe/CdS core-shell quantum rods (QRs) are a promising prospect in optoelectronic applications but usually have a relatively low quantum efficiency and stability. Here, we report on an efficient and stable CdSe/CdS/ZnS QRs-in-matrix assembly (QRAs) by growing and embedding CdSe/CdS QRs in ZnS matrices. Structural characterizations show that the CdSe/CdS QRs are encapsulated and interconnected by ZnS in the QRAs structure. The stable ZnS encapsulation renders the CdSe/CdS QRs high quantum efficiency (QE) up to 85%. The QRAs also present high photo- and thermal-stability and can preserve 93% of the initial QE at 100 °C. The QRAs powder presents a light degradation of only 2% under continuous excitation for 100 h, displaying profound potential in optoelectronic applications. White light-emitting diodes (WLEDs) are fabricated by packaging the QRAs powder as phosphor on top of blue GaN chip. The WLED shows high optical performance and light quality.

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15

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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16

Kadim, Akeel M. "White Light Generation from Emissive Hybrid Nanocrystals CdSe/CdTe/CdS Core/Shell/Shell System." Nano Hybrids and Composites 27 (November 2019): 1–10. http://dx.doi.org/10.4028/www.scientific.net/nhc.27.1.

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New nanocrystals (NCs) were engineered with a core/shell/shell system consisting of CdSe core/ CdTe shell/ CdS shell. The white light generation mechanism was described depending on mixing colors from the illuminated CdSe/CdTe/CdS core/shell/shell nanocrystals. The color mixed in CdSe/CdTe/CdS core/shell/shell NCs system were used to generate extreme white light when illuminated by InGaN/GaN UV LED (λ=360 nm) the core/shell/shell NCs system tuned the chromaticity coordinates to (0.332, 0.340) and increased the intensity of the emitted white light. The synthesis of the CdSe/CdTe/CdS core/shell/shell NCs were confirmed by SEM, AFM, XRD and photoluminescence (PL) experiments due to create of surface states defects information. This enhancement was recognized to the overlap of emission with the photoluminescence (PL) spectrum of CdSe/CdTe/CdS core/shell/shell NCs which indications to a cold white light generation. Current-voltage (I–V) characteristics indicate that the output current is good compared to the few voltages (6 V) used which give acceptable results to get a generation of white light.

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17

Zhang, Chenguang, Shaowen Liu, Xingwei Liu, Fei Deng, Yan Xiong, and Fang-Chang Tsai. "Incorporation of Mn 2+ into CdSe quantum dots by chemical bath co-deposition method for photovoltaic enhancement of quantum dot-sensitized solar cells." Royal Society Open Science 5, no. 3 (March 2018): 171712. http://dx.doi.org/10.1098/rsos.171712.

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A photoelectric conversion efficiency (PCE) of 4.9% was obtained under 100 mW cm −2 illumination by quantum-dot-sensitized solar cells (QDSSCs) using a CdS/Mn : CdSe sensitizer. CdS quantum dots (QDs) were deposited on a TiO 2 mesoporous oxide film by successive ionic layer absorption and reaction. Mn 2+ doping into CdSe QDs is an innovative and simple method—chemical bath co-deposition, that is, mixing the Mn ion source with CdSe precursor solution for Mn : CdSe QD deposition. Compared with the CdS/CdSe sensitizer without Mn 2+ incorporation, the PCE was increased from 3.4% to 4.9%. The effects of Mn 2+ doping on the chemical, physical and photovoltaic properties of the QDSSCs were investigated by energy dispersive spectrometry, absorption spectroscopy, photocurrent density–voltage characteristics and electrochemical impedance spectroscopy. Mn-doped CdSe QDs in QDSSCs can obtain superior light absorption, faster electron transport and slower charge recombination than CdSe QDs.

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18

Pan, Daocheng, Qiang Wang, Jiebin Pang, Shichun Jiang, Xiangling Ji, and Lijia An. "Semiconductor “Nano-Onions” with Multifold Alternating CdS/CdSe or CdSe/CdS Structure." Chemistry of Materials 18, no. 18 (September 2006): 4253–58. http://dx.doi.org/10.1021/cm0601032.

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19

Blas-Ferrando, Vicente M., Javier Ortiz, Victoria González-Pedro, Rafael S. Sánchez, Iván Mora-Seró, Fernando Fernández-Lázaro, and Ángela Sastre-Santos. "Efficient passivated phthalocyanine-quantum dot solar cells." Chemical Communications 51, no. 9 (2015): 1732–35. http://dx.doi.org/10.1039/c4cc08104h.

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The power conversion efficiency of CdSe and CdS quantum dot sensitized solar cells is enhanced up to 45% for CdSe and 104% for CdS by passivation with an asymmetrically disulfide substituted phthalocyanine.

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20

Mantashian, Grigor A., Paytsar A. Mantashyan, Hayk A. Sarkisyan, Eduard M. Kazaryan, Gabriel Bester, Sotirios Baskoutas, and David B. Hayrapetyan. "Exciton-Related Raman Scattering, Interband Absorption and Photoluminescence in Colloidal CdSe/CdS Core/Shell Quantum Dots Ensemble." Nanomaterials 11, no. 5 (May 12, 2021): 1274. http://dx.doi.org/10.3390/nano11051274.

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By using the numerical discretization method within the effective-mass approximation, we have theoretically investigated the exciton-related Raman scattering, interband absorption and photoluminescence in colloidal CdSe/CdS core/shell quantum dots ensemble. The interband optical absorption and photoluminescence spectra have been revealed for CdSe/CdS quantum dots, taking into account the size dispersion of the ensemble. Numerical calculation of the differential cross section has been presented for the exciton-related Stokes–Raman scattering in CdSe/CdS quantum dots ensemble with different mean sizes.

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21

Sozanskyi, M. A., P. Yo Shapoval, V. E. Stadnik, R. R. Guminilovych, and O. P. Kurylo. "Quantum-chemical modeling of the processes of cadmium sulfide and cadmium selenide films synthesis in aqueous solutions." Chemistry, Technology and Application of Substances 4, no. 1 (June 1, 2021): 26–32. http://dx.doi.org/10.23939/ctas2021.01.026.

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The quantum-chemical modeling of the synthesis process chemistry of CdS and CdSe in aqueos solutions was carried out. For that reason, the CdS synthesis simulation was carried out through the formation of Cd(II) complex forms with the trisodium citrate and ammonium hydroxide. At the CdSe synthesis, the sodium selenosulfate with and without trisodium citrate was used. It was established that this process passes through several intermediate stages with the transitional reactive complexes formation. On the basis of obtained data, the energy stages diagrams are constructed and the comparison of CdS and CdSe synthesis processes with various complexing agents has been carried out. The CdS and CdSe films were obtained by chemical synthesis method from an aqueous solution of cadmium salt, complexing and chalcogenizing agents. X-ray phase analysis confirmed the formation of desired compounds, which was predicted by modeling.

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22

Tian, Jian Jun. "Anisotropic Nanostructure ZnO Photoelectrodes for CdS/CdSe Quantum Dot Sensitized Solar Cells." Advanced Materials Research 873 (December 2013): 556–61. http://dx.doi.org/10.4028/www.scientific.net/amr.873.556.

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CdS/CdSe quantum dots co-sensitized solar cells (QDSCs) were prepared by combining the successive ion layer absorption and reaction (SILAR) method and chemical bath deposition (CBD) method for the fabrication of CdS and CdSe quantum dots, respectively. In this work, we designed anisotropic nanostructure ZnO photoelectrodes, such as nanorods/nanosheets and nanorods array, for CdS/CdSe quantum dots co-sensitized solar cells. Our study revealed that the performance of QDSCs could be improved by modifying surface of ZnO to increase the loading of quantum dots and reduce the charge recombination.

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23

Suseel Rahul, K., Nayana Devaraj, Rosmy K. Babu, Smitha Mathew, K. Salini, and Vincet Mathew. "Intraband absorption of D − center in CdSe/CdS/CdSe/CdS multilayer quantum dot." Journal of Physics and Chemistry of Solids 106 (July 2017): 99–104. http://dx.doi.org/10.1016/j.jpcs.2017.03.013.

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24

Kalisman, Philip, and Lilac Amirav. "Improved Efficiency and Stability of Cadmium Chalcogenide Nanoparticles by Photodeposition of Co-Catalysts." MRS Advances 1, no. 59 (2016): 3923–27. http://dx.doi.org/10.1557/adv.2016.239.

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ABSTRACTThe production of hydrogen by photocatalytic water splitting is a potentially clean and renewable source for hydrogen fuel. Cadmium chalcogenides are attractive photocatalysts because they have the potential to convert water into hydrogen and oxygen using photons in the visible spectrum. Cadmium sulfide rods with embedded cadmium selenide quantum dots (CdSe@CdS) are particularly attractive because of their high molar absorptivity in the UV-blue spectral region, and their energy bands can be tuned; however, two crucial drawbacks hinder the implementation of these materials in wide spread use: poor charge transfer and photochemical instability.Utilizing photochemical deposition of co-catalysts onto CdSe@CdS substrates we can address each of these weaknesses. We report how novel co-catalyst morphologies can greatly increase efficiency for the water reduction half-reaction. We also report photostability for CdSe@CdS under high intensity 455nm light (a wavelength at which photocatalytic water splitting by CdSe@CdS is possible) by growing metal oxide co-catalysts on the surface of our rods.

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25

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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26

Xu, Jianfeng, David Battaglia, Xiaogang Peng, and Min Xiao. "Photoluminescence from colloidal CdS-CdSe-CdS quantum wells." Journal of the Optical Society of America B 22, no. 5 (May 1, 2005): 1112. http://dx.doi.org/10.1364/josab.22.001112.

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27

Bradley, I. V., J. P. Creasey, K. P. O'Donnell, P. J. Wright, and B. Cockayne. "CdSCdSe and CdSZnSe intrinsic stark superlattices." Journal of Crystal Growth 159, no. 1-4 (February 1996): 551–54. http://dx.doi.org/10.1016/0022-0248(95)00660-5.

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28

Ünlü, Hilmi. "A thermoelastic model for strain effects on bandgaps and band offsets in heterostructure core/shell quantum dots." European Physical Journal Applied Physics 86, no. 3 (June 2019): 30401. http://dx.doi.org/10.1051/epjap/2019180350.

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A thermoelastic model is proposed to determine elastic strain effects on electronic properties of spherical Type I and Type II heterostructure core/shell quantum dots (QDs) as a function of dimensions of constituent semiconductors at any temperature. Proposed model takes into account the difference between lattice constants, linear expansion coefficients and anisotropy of elastic moduli (Young's modulus and Poisson's ratio) of constituent semiconductors, respectively. In analogous to lattice mismatch, we introduce so called the elastic anisotropy mismatch in heterostructures. Compressive strain acting on core (shell) side of heterointerfaces in CdSe/CdS, CdSe/ZnS, and ZnSe/ZnS QDs increases (decreases) as shell diameter is increased, which causes increase (decrease) in core bandgap as sell (core) diameter is increased in these nanostructures. Furthermore, there is a parabolic increase in conduction band offsets and core bandgaps in CdSe/CdS, CdSe/ZnS, and ZnSe/ZnS QDs and decrease in conduction band offset and core bandgap of ZnSe/CdS QD as core (shell) diameter increases for fixed shell (core) diameter. Comparison shows that using isotropic elastic moduli in determining band offsets and core band gaps gives better agreement with experiment than anisotropic elastic moduli for core bandgaps of CdSe/CdS, CdSe/ZnS, ZnSe/ZnS, and ZnSe/CdS core/shell QDs. Furthermore, we also show that the strain-modified two band effective mass approximation can be used to determine band offsets by using measured core band gaps in core/shell heterostructure QDs with Type II interface band alignment. Excellent agreement between predicted and measured core bandgaps in CdSe and ZnSe based core/shell QDs suggests that proposed model can be a good design tool for process simulation of core/shell heterostructure QDs.

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29

Heiba, Z. K. "X-ray quantitative analysis of the phases developed upon air annealing of ZnSe, CdSe, and CdS semiconductors." Powder Diffraction 17, no. 3 (September 2002): 191–95. http://dx.doi.org/10.1154/1.1487862.

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The phases developed upon annealing of ZnSe, CdSe, and CdS semiconductors in air are investigated applying X-ray qualitative and quantitative phase analysis. The compositions of the thermally grown oxides over the 373–773 K temperature range are found to be ZnO and ZnSeO3 for ZnSe, CdSeO3 for CdSe and CdSO4 and Cd3O2SO4 for CdS. The percentage phase abundance of each phase is determined at each temperature applying a standardless method. At all temperatures, the oxides are predominantly ZnO with about 10% ZnSeO3 at 773 K in case of ZnSe and CdSO4 with about 9% Cd3O2SO4 at 773 K in case of CdS. The rate of oxidation with temperature is found to be nonlinear for the three chalcogenides. CdS is found to be more resistible for oxidation than CdSe and ZnSe.

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30

Qu, Yu Qiu, Liu Yang Zhang, Li Min An, Hong Wei, and Gui Fan Li. "Study on Photoluminescence Quenching of CdSe Core/Shell Quantum Dots with Organic Charge Transferring Material." Advanced Materials Research 981 (July 2014): 883–86. http://dx.doi.org/10.4028/www.scientific.net/amr.981.883.

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The effect of organic charge transferring material (CTM) on fluorescence of CdSe/ZnS and CdSe/CdS/ZnS core/shell quantum dots (QDs) are investigated by spectral methods. With the increase of organic molecular concentration, CTM can greatly quench the fluorescence of QDs and shorten the fluorescence lifetime of QDs. In the process of interacting with CTM, the efficiency of fluorescence quenching for CdSe/ZnS is significantly higher than that for CdSe/CdS/ZnS. The results of experiment show that the shell structure of QDs plays the major role in photoluminescence (PL) quenching. The mechanism of PL quenching of QDs is also analyzed.

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31

Shmelev, Artemiy, Victor Nikiforov, Dmitrii Zharkov, Andrey Leontyev, and Vladimir Lobkov. "Quantum dots photoinduced charges dynamics – model of crystall lattice defects." EPJ Web of Conferences 220 (2019): 02015. http://dx.doi.org/10.1051/epjconf/201922002015.

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We report the results of core-shell (CdSe/CdS) quantum dots study. Quantum dots sizes were evaluated as 2.0 and 2.9 nm from absorbance edge position. We suggest two types of traps, predict properties of these traps based on upconversion luminescence data and previous studies of quantum dots (CdSe cores only) and bulk CdS.

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32

Halsall, M. P., J. E. Nicholls, J. J. Davies, B. Cockayne, and P. J. Wright. "CdS/CdSe intrinsic Stark superlattices." Journal of Applied Physics 71, no. 2 (January 15, 1992): 907–15. http://dx.doi.org/10.1063/1.351312.

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33

Nguyen, Thanh Binh, Thi Bich Vu, Dinh Cong Nguyen, Thi Thao Do, Hong Minh Pham, and Marilou Cadatal-Raduban. "Photodynamic Properties of CdSe/CdS Quantum Dots in Intracellular Media." Applied Sciences 10, no. 11 (June 9, 2020): 3988. http://dx.doi.org/10.3390/app10113988.

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CdSe/CdS quantum dots (QDs) were seeded into Jurkat cells using polyethylene glycol (PEG-1500) at different treatment times. Fluorescence microscopy images show that some QDs stick to the surface of the cells, while others appeared to be inside the cells. As it is difficult to ascertain whether the QDs are indeed inside the cells or just behind the cells, additional spectroscopic studies were performed. Photoluminescence spectra show that the fluorescence intensities of the CdSe/CdS QDs are different between samples at different treatment times. Interestingly, the fluorescence lifetimes are also different. This confirms the interaction between the CdSe/CdS QDs and the intracellular media and that the QDs were successfully seeded into the cells.

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Chauhan, Himani, Yogesh Kumar, and Sasanka Deka. "New synthesis of two-dimensional CdSe/CdS core@shell dot-in-hexagonal platelet nanoheterostructures with interesting optical properties." Nanoscale 6, no. 17 (2014): 10347–54. http://dx.doi.org/10.1039/c4nr01264j.

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35

Bao, Yan Jie, Jun Jun Li, Yi Ting Wang, Lei Yu, Lei Lou, Wei Ji Du, Zi Qiang Zhu, Hui Peng, and Jian Zhong Zhu. "Probing cytotoxicity of CdSe and CdSe/CdS quantum dots." Chinese Chemical Letters 22, no. 7 (July 2011): 843–46. http://dx.doi.org/10.1016/j.cclet.2010.12.008.

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36

Mukhina, Maria V., Vladimir G. Maslov, Ivan V. Korsakov, Finn Purcell Milton, Alexander Loudon, Alexander V. Baranov, Anatoly V. Fedorov, and Yurii K. Gun’ko. "Optically active II-VI semiconductor nanocrystals via chiral phase transfer." MRS Proceedings 1793 (2015): 27–33. http://dx.doi.org/10.1557/opl.2015.652.

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ABSTRACTWe report optically active ensembles of II-VI semiconductor nanocrystals prepared via chiral phase transfer, which is initiated by exchange of the original achiral ligands capping the nanocrystals surfaces for chiral L- and D-cysteine. We used this method to obtain ensembles of CdSe, CdS, ZnS:Mn, and CdSe/ZnS quantum dots and CdSe/CdS quantum rods exhibited Circular Dichroism (CD) and Circularly Polarized Luminescence (CPL) signals. The optically active nanocrystals revealed the CD and CPL bands strongly correlated with absorption and luminescence bands with unique band “pattern” for each material and the nanocrystal shape.

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Tian, Jianjun, Lili Lv, Chengbin Fei, Yajie Wang, Xiaoguang Liu, and Guozhong Cao. "A highly efficient (>6%) Cd1−xMnxSe quantum dot sensitized solar cell." J. Mater. Chem. A 2, no. 46 (2014): 19653–59. http://dx.doi.org/10.1039/c4ta04534c.

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38

Zou, Xiaoping, Sheng He, Gongqing Teng, and Chuan Zhao. "Performance Study of CdS/Co-Doped-CdSe Quantum Dot Sensitized Solar Cells." Journal of Nanomaterials 2014 (2014): 1–6. http://dx.doi.org/10.1155/2014/818160.

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In order to optimize the charge transfer path in quantum dot sensitized solar cells (QDSCs), we employed successive ionic layer adsorption and reaction method to dope CdSe with Co for fabricating CdS/Co-doped-CdSe QDSCs constructed with CdS/Co-doped-CdSe deposited on mesoscopic TiO2film as photoanode, Pt counter electrode, and sulfide/polysulfide electrolyte. After Co doping, the bandgap of CdSe quantum dot decreases, and the conduction band and valence band all improve, forming a cascade energy level which is more conducive to charge transport inside the solar cell and reducing the recombination of electron-hole thus improving the photocurrent and ultimately improving the power conversion efficiency. This work has not been found in the literature.

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39

Pereira Ramanery, Fábio, Alexandra Ancelmo Piscitelli Mansur, and Herman Sander Mansur. "CdSe/CdS Core/Shell Quantum Dots Synthesized with Water Soluble Polymer for Potential Biosensor Applications." Materials Science Forum 805 (September 2014): 83–88. http://dx.doi.org/10.4028/www.scientific.net/msf.805.83.

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Quantum dots (QDs) are very promising advanced materials due to their nanoscale dimensions and properties of quantum confinement. Among the most promising applications of QDs, the use as biomaterials is highlighted, especially as optical biosensors and biomarkers. In this work CdSe-CdS core-shell nanoparticles were obtained through colloidal aqueous route at room temperature. The biocompatible polymer poly (vinyl alcohol) modified with carboxyl groups (PVA-COOH) was used as a stabilizing agent. The effect of growing CdS shell on the quantum properties and dimensions of CdSe nanoparticles (core-shell structure) was studied by UV-vis spectroscopy, photoluminescence (PL) and transmission electron microscopy (TEM). The results showed the influence of the growth of the CdS shell layers in the optical properties of quantum dots. Based on the results it can be stated that conjugated systems of CdS/CdSe-PVA-COOH were obtained and exhibited enhanced photoluminescent behavior, an essential property to use this system in biosensing devices.

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Xu, Jianfeng, and Min Xiao. "Lasing action in colloidal CdS∕CdSe∕CdS quantum wells." Applied Physics Letters 87, no. 17 (October 24, 2005): 173117. http://dx.doi.org/10.1063/1.2119423.

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Xie, Yi, Yitai Qian, Shuyuan Zhang, Yi Xie, Ping Yan, and Jun Lu. "CdS/CdSe core/sheath nanostructures obtained from CdS nanowires." Chemical Communications, no. 19 (1999): 1969–70. http://dx.doi.org/10.1039/a905669f.

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42

Prudnikau, Anatol, Andrey Chuvilin, and Mikhail Artemyev. "CdSe–CdS Nanoheteroplatelets with Efficient Photoexcitation of Central CdSe Region through Epitaxially Grown CdS Wings." Journal of the American Chemical Society 135, no. 39 (September 20, 2013): 14476–79. http://dx.doi.org/10.1021/ja401737z.

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SHEN, QI-HUI, YAN LIU, XI YU, XIAO-YANG LIU, MING-QIANG ZOU, JIN-FENG LI, and JIAN-GUANG ZHOU. "FORMATION OF II–VI SEMICONDUCTOR NANOCRYSTALS WITH TUNABLE VISIBLE EMISSION IN AQUEOUS SOLUTION PROMOTED BY HYDRAZINE." Nano 07, no. 06 (December 2012): 1250046. http://dx.doi.org/10.1142/s1793292012500464.

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II–VI Semiconductor nanocrystals (NCs) with tunable visible emission, such as CdS , CdSe and CdTe , were synthesized in aqueous solution using thiols as capping molecules. Hydrazine was found to promote the growth of NCs through a special mechanism. In only a few hours, the synthesis process was completed at room temperature. Under moderate conditions, the capping molecules not only changed the growth rate of NCs simply by varying the concentration, but also altered the spectral properties of NCs. The capping molecules with amino groups were propitious to the growth of CdS NCs, whereas the kinetic growth of CdS NCs was more affected by the surface passivation efficiency of NCs than by steric hindrance in the system. The fastest growth of the CdS NCs was achieved when glutathione was used as a capping molecule, while the emission of CdS and CdSe NCs were shown to remain steady and tunable using the same capping molecule. The growth rate of 3-mercaptopropionic acid-capped CdS and CdSe NCs slowed down significantly, while CdTe NCs were obtained with excellent emission properties when capped with the same molecule. Furthermore, our approach will also be useful for the study of the kinetic growth of NCs in aqueous solution.

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Zhang, Bingkai, Jiaxin Zheng, Xiaoning Li, Yanyan Fang, Lin-Wang Wang, Yuan Lin, and Feng Pan. "Tuning band alignment by CdS layers using a SILAR method to enhance TiO2/CdS/CdSe quantum-dot solar-cell performance." Chemical Communications 52, no. 33 (2016): 5706–9. http://dx.doi.org/10.1039/c6cc01664b.

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Tuning band alignment by optimized CdS layers using SILAR can achieve the best performance of TiO₂/CdS/CdSe QDSSCs.The tuning mechanism originates from the interface dipole induced by bond interaction and CdS structure distortion induced by lattice mismatch.

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Purcell-Milton, Finn, Antton Curutchet, and Yurii Gun’ko. "Electrophoretic Deposition of Quantum Dots and Characterisation of Composites." Materials 12, no. 24 (December 7, 2019): 4089. http://dx.doi.org/10.3390/ma12244089.

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Electrophoretic deposition (EPD) is an emerging technique in nanomaterial-based device fabrication. Here, we report an in-depth study of this approach as a means to deposit colloidal quantum dots (CQDs), in a range of solvents. For the first time, we report the significant improvement of EPD performance via the use of dichloromethane (DCM) for deposition of CQDs, producing a corresponding CQD-TiO2 composite with a near 10-fold increase in quantum dot loading relative to more commonly used solvents such as chloroform or toluene. We propose this effect is due to the higher dielectric constant of the solvent relative to more commonly used and therefore the stronger effect of EPD in this medium, though there remains the possibility that changes in zeta potential may also play an important role. In addition, this solvent choice enables the true universality of QD EPD to be demonstrated, via the sensitization of porous TiO2 electrodes with a range of ligand capped CdSe QDs and a range of group II-VI CQDs including CdS, CdSe/CdS, CdS/CdSe and CdTe/CdSe, and group IV-VI PbS QDs.

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Singha, A., and Anushree Roy. "Quantitative analysis of thermal stability of CdSe/CdS core-shell nanocrystals under infrared radiation." Journal of Materials Research 21, no. 6 (June 1, 2006): 1385–89. http://dx.doi.org/10.1557/jmr.2006.0170.

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Here, we report investigations on the instability in luminescence of bare (trioctylphosphine oxide [TOPO]-stabilized) and CdS-capped CdSe particles under infrared radiation. During thermal annealing under radiation, the formation of oxide layers on the surfaces of the particles create defect states. Consequently, there is a reduction in particle size. These two effects control the light output from the samples. We make a quantitative comparison of the stability of bare CdSe and core-shell-type CdSe-CdS particles during annealing under infrared radiation. Using diffusion theory, we show that the volume of the oxide layer, adhered to the crystallites, plays a dominant role in controlling the luminosity of the particles.

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Hao, Encai, Haiping Sun, Zheng Zhou, Junqiu Liu, Bai Yang, and Jiacong Shen. "Synthesis and Optical Properties of CdSe and CdSe/CdS Nanoparticles." Chemistry of Materials 11, no. 11 (November 1999): 3096–102. http://dx.doi.org/10.1021/cm990153p.

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48

Лебедев, А. И. "Расчеты из первых принципов колебательных спектров сверхрешеток CdSe/CdS." Физика твердого тела 63, no. 12 (2021): 2038. http://dx.doi.org/10.21883/ftt.2021.12.51663.156.

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The vibrational spectra of CdSe/CdS superlattices (SLs) with different layer thicknesses are calculated from first principles within the density functional theory. It is shown that, along with folded acoustic and confined optical modes, a number of confined acoustic modes appear in SLs. In structures with a minimum thickness of one of the layers, microscopic interface modes similar to local and gap modes in crystals appear. An analysis of projections of the eigenvectors of vibrational modes in SLs onto the orthonormal basis of normal modes in binary compounds enables to establish the details of formation of these vibrational modes and, in particular, to determine the degree of intermixing of acoustic and optical modes. A comparison of the frequencies of vibrational modes in CdSe/CdS SLs and CdSe/CdS nanoplatelets enables to separate the influence of size quantization and surface relaxation on the vibration frequencies in the nanoplatelets.

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Rodlovskaya, Elena N., Valeriy A. Vasnev, Alexander V. Naumkin, Andrei A. Vashchenko, and Dmitry O. Goriachiy. "The development of hybrid materials that combine polyamides with thienothiophene units and inorganic objects." High Performance Polymers 29, no. 6 (May 3, 2017): 704–7. http://dx.doi.org/10.1177/0954008317702207.

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The results of an experimental study of organic light-emitting diodes with poly-2,5-(3,4-diamino-thieno[2,3-b]thiophene)-4,4′-amidoarylene transport layers and CdSe/CdS/ZnS quantum dots with 4.1 nm CdSe core are presented.

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Khitrov, Greg. "Soluble CdS and CdSe Nanorods Synthesized." MRS Bulletin 25, no. 7 (July 2000): 4. http://dx.doi.org/10.1557/mrs2000.102.

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