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ZnS and ZnS/CdS core-shell Nano particles: Synthesis, properties and Perspectives
Surfaces and Interfaces ( IF 6.2 ) Pub Date : 2020-12-01 , DOI: 10.1016/j.surfin.2020.100757
J. Madhavi , V. Prasad

ABSTRACT From ancient times, nanoparticles with the diameter in the scope of 1-20nm become a foremost interdisciplinary area of research. Now a day's in technology, II-VI Semiconductors perform a key role. By chemical precipitation technique, ZnS and ZnS/CdS core-shell nanoparticles are arranged with suitable thickness. Core particles are prepared first and then the amalgamation process of shells is performed by selecting ethanol as solvent at ordinary temperature. The structural and chemical characterizations were performed by utilizing X-ray diffraction (XRD), Scanning electron microscopy (SEM-EDAX) with energy dispersive, transmission electron microscopy (TEM), Fourier Transforms Infrared Spectroscopy (FTIR), Optical Absorption Spectroscopy (UV visible), Photoluminescence (PL) and Vibrating Sample Magnetometer (VSM). Shell growth is identified from XRD, SEM with EDAX, TEM. Using UV-Visible Spectroscopy optical properties were characterized. Powder XRD pattern exhibits peaks correspond to cubic phase of ZnS and ZnS/CdS core-shell nano particles and estimated the average particle size from Debye's Scherer's method is approximately equals to the individual methods of Williamson-Hall methods and are in the order of nm and also hold good with theoretical values from UV-Vis. It is practical that the inclusion perimeter was sort at 200–260 nm and corresponding energy gaps is 1.22eV and 3.02eV respectively, which is red-shifted compared to bulk ZnS (345nm) and the excitonic wavelength at 310 nm (3.99 eV). The cubic formation of bulk ZnS show the apparent red-shift, then the energy gap of the major portion of ZnS is 3.68 eV (345 nm). By stiffness effects, the radiant intensity gap is acquired with Brus equality. Luminescence is acquired to the recombination during the sulfur vacancy associated electron capture donor under the CB and ZnS correlated hole trap acceptor beyond the VB as report prior. The calculated coordinates of prepared sample and the theoretical values of chromaticity epicentre is (Xe, Ye) are at Xe = 0.3320 andYe = 0.1858. The M-H loop of the as-synthesized core-shell nanoparticles showed intrinsic ferromagnetic behaviour.

中文翻译:

ZnS 和 ZnS/CdS 核壳纳米颗粒:合成、性质和前景

摘要 自古以来,直径在 1-20nm 范围内的纳米粒子成为最重要的跨学科研究领域。现在,在技术方面,II-VI 半导体发挥着关键作用。通过化学沉淀技术,ZnS和ZnS/CdS核壳纳米粒子以合适的厚度排列。先制备核粒子,然后选择乙醇为溶剂,在常温下进行壳的汞齐化过程。通过利用 X 射线衍射 (XRD)、具有能量色散的扫描电子显微镜 (SEM-EDAX)、透射电子显微镜 (TEM)、傅里叶变换红外光谱 (FTIR)、光学吸收光谱 (UV 可见光) 进行结构和化学表征)、光致发光 (PL) 和振动样品磁强计 (VSM)。壳生长由XRD、SEM与EDAX、TEM鉴定。使用紫外可见光谱对光学特性进行表征。粉末 XRD 图显示的峰对应于 ZnS 和 ZnS/CdS 核壳纳米颗粒的立方相,并且根据 Debye's Scherer's 方法估计的平均粒径大约等于 Williamson-Hall 方法的各个方法,并且在 nm 和也适用于 UV-Vis 的理论值。实际上,夹杂物周长在 200-260 nm 之间进行分类,相应的能隙分别为 1.22eV 和 3.02eV,与块状 ZnS (345nm) 和激子波长在 310 nm (3.99 eV) 相比发生红移。块状 ZnS 的立方结构显示出明显的红移,则大部分 ZnS 的能隙为 3.68 eV (345 nm)。通过刚度效应,辐射强度差距是通过布鲁斯等式获得的。如先前报道的那样,在CB和ZnS相关空穴陷阱受体下的硫空位相关电子捕获供体下的重组过程中获得了发光。制备样品的计算坐标和色度震中的理论值是(Xe,Ye)在Xe = 0.3320和Ye = 0.1858。合成的核壳纳米粒子的 MH 环显示出固有的铁磁行为。3320 和 Ye = 0.1858。合成的核壳纳米粒子的 MH 环显示出固有的铁磁行为。3320 和 Ye = 0.1858。合成的核壳纳米粒子的 MH 环显示出固有的铁磁行为。
更新日期:2020-12-01
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