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Search Results: 1 - 10 of 2493 matches for " Mn:CdS Nanoparticle "
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A Novel Thermochemical Method for Fabrication and Theoretical Explanation of High Luminescent Mn-Doped CdS Nanoparticles  [PDF]
Mostafa Darvishi, Alireza Nikfarjam
Journal of Materials Science and Chemical Engineering (MSCE) , 2018, DOI: 10.4236/msce.2018.63001
Abstract: In this paper, fabrication and characterization of bare and doped CdS nanoparticles as well as investigating the luminescence properties of these particles as an important II-VI semiconductor are presented. A novel Thermochemical method was used for synthesis of these quantum dots. Thiols were used as the capping agent to prevent further growth during fabrication process. The application of TGA as a capping agent instead of TG was studied as a novel idea in this paper and was used practically in the synthesis of semiconductor nanoparticles. Using this process resulted in particles with sizes between 3 - 7 nm. Several samples were synthesized and characterized under various Mn ions doping ratio from 1:10 to 1:180, different temperatures from 40℃ to 96℃ and different pH values from 6 to 10. Synthesis of CdS nanoparticles with high Mn ions concentration resulted in luminescence decrement, while luminescence of nanoparticles was increased by decreasing Mn/Cd doping ratio until Mn:Cd = 1:180. The best fabrication temperature was obtained at 96℃ and the highest luminescence was observed at the pH value of 9. A theoretical explanation for the behavior of fabricated high luminescent quantum dots is presented based on the principles of quantum mechanics.
Preparation and Tribology Behavior of CdS Nanoparticles in Room Temperature Ionic Liquid

ZHANG Chun-li,ZHANG Sheng-mao,WU Zhi-shen,ZHANG Zhi-jun,ZHANG Ping-yu,

摩擦学学报 , 2006,
Abstract: CdS nanoparticles were prepared in a room temperature ionic liquid, 1-methyl-3-hexyl-imidazolium tetrafluoroborate. X-ray powder diffraction and transmission electron microscopy were used to characterize the structure of the CdS nanoparticles. The results indicate that the average diameter of the nanoparticles is about 15 nm. The nanoparticles have hexagonal structure. The tribological behaviors of 1-methyl-3-hexyl-imidazolium tetrafluoroborate ionic liquid and its complex system which containing CdS nanoparticles were studied on a four-ball machine. The results indicate that the ionic liquid containing CdS nanoparticles shows better tribological behavior than pure ionic liquid. CdS nanoparticles increased the decomposition of anion existing in ionic liquid, and their rolling/sliding reduced the friction.
Synthesis and application of luminescent single CdS quantum dot encapsulated silica nanoparticles directed for precision optical bioimaging
Veeranarayanan S, Poulose AC, Mohamed MS, Nagaoka Y, Iwai S, Nakagame Y, Kashiwada S, Yoshida Y, Maekawa T, Kumar DS
International Journal of Nanomedicine , 2012, DOI: http://dx.doi.org/10.2147/IJN.S31310
Abstract: thesis and application of luminescent single CdS quantum dot encapsulated silica nanoparticles directed for precision optical bioimaging Original Research (3412) Total Article Views Authors: Veeranarayanan S, Poulose AC, Mohamed MS, Nagaoka Y, Iwai S, Nakagame Y, Kashiwada S, Yoshida Y, Maekawa T, Kumar DS Published Date July 2012 Volume 2012:7 Pages 3769 - 3786 DOI: http://dx.doi.org/10.2147/IJN.S31310 Received: 29 February 2012 Accepted: 28 April 2012 Published: 17 July 2012 Srivani Veeranarayanan, Aby Cheruvathoor Poulose, M Sheikh Mohamed, Yutaka Nagaoka, Seiki Iwai, Yuya Nakagame, Shosaku Kashiwada, Yasuhiko Yoshida, Toru Maekawa, D Sakthi Kumar Bio Nano Electronics Research Centre, Graduate School of Interdisciplinary New Science, Toyo University, Kawagoe, Japan Abstract: This paper presents the synthesis of aqueous cadmium sulfide (CdS) quantum dots (QDs) and silica-encapsulated CdS QDs by reverse microemulsion method and utilized as targeted bio-optical probes. We report the role of CdS as an efficient cell tag with fluorescence on par with previously documented cadmium telluride and cadmium selenide QDs, which have been considered to impart high levels of toxicity. In this study, the toxicity of bare QDs was efficiently quenched by encapsulating them in a biocompatible coat of silica. The toxicity profile and uptake of bare CdS QDs and silica-coated QDs, along with the CD31-labeled, silica-coated CdS QDs on human umbilical vein endothelial cells and glioma cells, were investigated. The effect of size, along with the time-dependent cellular uptake of the nanomaterials, has also been emphasized. Enhanced, high-specificity imaging toward endothelial cell lines in comparison with glioma cells was achieved with CD31 antibody-conjugated nanoparticles. The silica-coated nanomaterials exhibited excellent biocompatibility and greater photostability inside live cells, in addition to possessing an extended shelf life. In vivo biocompatibility and localization study of silica-coated CdS QDs in medaka fish embryos, following direct nanoparticle exposure for 24 hours, authenticated the nanomaterials' high potential for in vivo imaging, augmented with superior biocompatibility. As expected, CdS QD-treated embryos showed 100% mortality, whereas the silica-coated QD-treated embryos stayed viable and healthy throughout and after the experiments, devoid of any deformities. We provide highly cogent and convincing evidence for such silica-coated QDs as a model nanoparticle in practice, to achieve in vitro and in vivo precision targeted imaging.
南京邮电大学学报(自然科学版) , 2009,
Abstract: 通过反胶束法合成了分散性较好的mn2+掺杂的cds/sio2核壳纳米结构,在合成过程中,没有添加任何偶联剂。利用高分辨透射电镜和电子衍射仪器对合成的纳米颗粒的结构进行了表征。进一步研究了这些纳米颗粒的光致发光谱、光致发光激发谱和电子自旋共振谱,对于不同的mn2+掺杂的cds/sio2核壳纳米结构的发光特性和机制进行了详细的分析。这些稳定的荧光纳米颗粒可望在生物、医学等方面以及与材料相关的领域内有广泛的应用。
The Effect of Zn Concentration on the Optical Properties of Cd10–xZnxS Films for Solar Cells Applications  [PDF]
Nathera A. Al-Tememee, Nada M. Saeed, Sundus M. A. Al-Dujayli, Baha T. Chiad
Advances in Materials Physics and Chemistry (AMPC) , 2012, DOI: 10.4236/ampc.2012.22012
Abstract: In this paper, Cd10–xZnxS (x = 0.1, 0.3, 0.5) films were deposited by using chemical spray pyrolysis technique, the molar concentration precursor solution was 0.15 M/L. Depositions were done at 350?C on cleaned glass substrates. X-ray diffraction technique (XRD) studies for all the prepared film; all the films are crystalline with hexagonal structure .The optical properties of the prepared films were studied using measurements from VIS-UV-IR spectrophotometer at wave-length with the range 300 - 900 nm; the average transmission of the minimum doping ratio (Zn at 0.1%) was about 55% in the VIS region, it was decrease at the increasing of Zn concentration in the CdS films, The band gap of the doped CdS films was varied as 3.7, 3.8, 3.6 eV at x = 0.1, 0.3 and 0.5 respectively.
Soot and Nanomaterials Synthesis in the Flame  [PDF]
Z. Mansurov
Journal of Materials Science and Chemical Engineering (MSCE) , 2014, DOI: 10.4236/msce.2014.21001

The general scheme of conversion of hydrocarbon fuels with new experimental data on the formation of fullerenes and graphenes taking into account the pressure effect is proposed for the fuel-rich flames. It is shown that the formation of fullerenes is important to the corresponding spatial orientation of PAH, possible at low pressures. The formation of hydrophobic soot surface on silicon and nickel substrates during combustion of propane-oxygen flame was studied. It is established that the hydrophobic properties are due to the presence of soot particles in the form nanobeads. The photovoltaic properties of solar cells coated by nickel oxide nanoparticles synthesized in counter flow propane-air flame. It is revealed that coated the surface of a silicon solar cell by nickel oxide nanoparticles results in the increase in solar cell efficiency by 3%.

Preparation and Optical Properties of CdS u/CdS Nanocrystals
CAI Ke,WANG Hong-Zhe,SHEN Huai-Bin,TAO Xiao-Jun,LI Lin-Song,DU Zu-Liang
无机材料学报 , 2009, DOI: 10.3724/sp.j.1077.2009.00247
Abstract: CdS cores were successfully synthesized in noncoordinating solvents. The composite structure of core/shell CdS u/CdS nanocrystals was obtained through the modification of as-prepared Cu2+ ions doped CdS cores using successive ion layer adsorption and reaction (SILAR) technique. The crystal structures, shapes and optical properties of as-synthesized nanocrystals were characterized by X-ray diffraction, transmission electron microscope, UV-Vis absorption and photoluminescence spectroscope. The results show that the crystal structure of asa2prepared CdS u/CdS nanocrystal is zinc blende. Compared with pure CdS nanocrystals, the Cu2+ dopant in CdS leads the surfacea2state related emission peak shifting to longer wavelength. The surfacea2state related emission of CdS u nanocrystal can also be adjusted consecutively from 570nm to 620nm by tuning the doping concentration of Cu2+ ions from 2% to 6%. The overcoating of CdS shell can increase the stability of surfacea2state related emission of CdS u nanocrystals.
Dual-Sacrificial Template Synthesis of One-Dimensional Tubular Pt-Mn3O4-C Composite with Excellent Electrocatalytic Performance for Methanol Oxidation

- , 2015, DOI: 10.3866/PKU.WHXB201503241
Abstract: 通过双牺牲模板法合成了以一维管状Mn3O4-C为催化剂载体的新型Pt 基电催化剂. 催化剂的表面形貌、晶体结构及其组成分别采用透射电镜、X射线衍射仪、能量散射X射线光谱进行表征. 通过循环伏安法对Pt-Mn3O4-C复合物的电化学性能进行了测试. 结果表明平均粒径为1.8 nm的Pt 纳米颗粒均匀分散在管式Mn3O4-C载体上, 与商业的E-TEK Pt/C 催化剂(20% (w, 质量分数) Pt)相比, Pt-Mn3O4-C对甲醇氧化有更好的电催化活性和更高的稳定性. Pt 纳米粒子在Mn3O4-C上的均匀分散及Pt 和Mn3O4的协同催化效应使得Pt-Mn3O4-C具有优异的性能.
A new Pt-based electrocatalyst with one-dimensional tubular Mn3O4-C as the catalyst support was synthesized by a dual-sacrificial template strategy. The morphology, structure, and composition of the Pt-Mn3O4- C composite were characterized by transmission electron microscopy, X-ray diffraction, and energy dispersive X-ray spectroscopy, respectively. The electrochemical performance of Pt-Mn3O4-C was investigated by cyclic voltammetry. The results show that Pt nanoparticles with an average size of 1.8 nm are uniformly dispersed on tubular Mn3O4-C, and Pt-Mn3O4-C exhibits superior electrocatalytic activity and higher stability for methanol oxidation than the commercial E-TEK Pt/C catalyst (20% (w, mass fraction) Pt). The excellent performance of Pt-Mn3O4-C is attributed to the uniform dispersion of Pt nanoparticles on Mn3O4-C and the synergetic catalytic effect of Pt and Mn3O4
Review: Low Cost, Environmentally Friendly Humic Acid Coated Magnetite Nanoparticles (HA-MNP) and Its Application for the Remediation of Phosphate from Aqueous Media  [PDF]
Tadewos Damena, Tajeldin Alansi
Journal of Encapsulation and Adsorption Sciences (JEAS) , 2018, DOI: 10.4236/jeas.2018.84013
Abstract: Phosphate is a primary nutrient required for the normal functioning of many organisms in the ecosystem. However, presence of excess phosphate into the aquatic systems leads to eutrophication which can promote harmful algal growth and decrease the amount of dissolved oxygen in water. Municipal, industrial and agricultural run-off wastewaters are the major point sources for phosphate discharges. There are different methods to remove phosphates from water. Among these, adsorption is the most widely accepted method for phosphate removal because of its high efficiency, minimum cost, easy and simple operation and applicability at lower concentrations. The emphasis of this review, is to consolidate low cost, environmentally friendly humic acid coated magnetite nanoparticles (HA-MNP) and its application for the remediation of phosphate from aqueous media. The magnetic nanoparticles could be easily separated from the reaction mixture by using a simple hand held magnet and adsorption studies demonstrate the fast and effective separation of phosphate with maximum removal efficiency > 90% at pH 6.6. The adsorption behavior follows the Freundlich isotherm and the removal of phosphate is found higher at acidic and neutral pH compared to basic conditions. The nanoparticles exhibit good selectivity and adsorption efficiency for phosphate in the presence of co-existing ions such as Cl-, \"\"
Power Conversion Enhancement of CdS/CdTe Solar Cell Interconnected with Tunnel Diode  [PDF]
Wagah F. Mohammed, Omar Daoud, Munther Al-Tikriti
Circuits and Systems (CS) , 2012, DOI: 10.4236/cs.2012.33032
Abstract: One of the most promising solar cell devices is cadmium telluride (CdTe) based. These cells however, have their own problems of stability and degradation in efficiency. Measurements show that CdS/CdTe solar cell has high series resistance which degrades the performance of solar cell energy conversion. Both active layers (CdS and CdTe) had been fabricated by thermal evaporation and tested individually. It was found that CdS window layer of 300 nm have the lowest series resistance with maximum light absorption. While 5 - 7 μm CdTe absorber layer absorbed more than 90% of the incident light with minimum series resistance. A complete CdS/CdTe solar cell was fabricated and tested. It was found that deposited cell without heat treatment shows that the short circuit current increment decreases as the light intensity increases. This type of deposited cell has low conversion efficiency. The energy conversion efficiency was improved by heat treatment, depositing heavily doped layer at the back of the cell and minimizing the contact resistivity by depositing material with resistivity less than 1 m??cm2. All these modifications were not enough because the back contact is non-ohmic. Tunnel diode of CdTe (p++)/CdS (n++) was deposited in the back of the cell. The energy conversion efficiency was improved by more than 7%.
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