A Study of the Structural, Morphological and Luminescence Characteristics of Polyvinyl Pyrrolidone and Chitosan Capped Calcium Sulfide Nanoparticles

EngRN: Engineering Design Process (Topic) Pub Date : 2020-04-27 DOI:10.2139/ssrn.3611862

R. S

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Abstract

Semiconductor nanoparticles have gained impressive attention due to their novel optical and electronic properties. Here we report the synthesis of calcium sulfide (CaS) nanophosphors through a simple wet chemical co-precipitation method using two different capping agents polyvinyl pyrrolidone (PVP) and chitosan. The role of capping agents in determining the particle size, morphology and luminescence of CaS nanoparticles was determined using X-ray Diffraction (XRD), Transmission Electron Microscopy (TEM), room temperature Photoluminescence (PL), UV-Vis spectroscopy and Fourier Transform Infrared (FTIR) spectroscopy. XRD studies confirmed that the nanoparticles were crystallized in cubic phase with space group 3 Fm m. PL emission spectra of the capped samples consisted of broad peaks in the range 350-500 nm with enhanced PL intensity compared to that of uncapped sample. An increase in bandgap was observed due to capping which may be attributed to size quantization effects. Capped nanoparticles showed better structural and optical properties compared to uncapped samples which can be exploited in various optoelectronic and biomedical applications.

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聚乙烯醇吡咯烷酮和壳聚糖包覆硫化钙纳米颗粒的结构、形态和发光特性研究

半导体纳米颗粒由于其新颖的光学和电子特性而引起了人们的广泛关注。本文报道了以聚乙烯醇吡咯烷酮(PVP)和壳聚糖为封盖剂，采用简单的湿化学共沉淀法合成硫化钙(CaS)纳米磷光体。采用x射线衍射(XRD)、透射电子显微镜(TEM)、室温光致发光(PL)、紫外可见光谱(UV-Vis)和傅里叶变换红外光谱(FTIR)等方法，研究了封盖剂对CaS纳米粒子粒径、形貌和发光性能的影响。XRD研究证实，纳米颗粒呈立方相结晶，空间群为3 Fm m。封盖后样品的PL发射光谱在350 ~ 500 nm范围内有宽峰，且PL强度较未封盖样品增强。观察到由于封顶导致的带隙增加，这可能归因于尺寸量化效应。与未封顶的样品相比，封顶的纳米颗粒具有更好的结构和光学性能，可用于各种光电和生物医学应用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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EngRN: Engineering Design Process (Topic)

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