pH和壳厚变化对PVA包封CdSe和CdSe/ZnO纳米粒子光学和结构特性的影响

Q4 Materials Science Journal of Surface Science and Technology Pub Date : 2023-02-15 DOI:10.18311/jsst/2021/28435
Pallab Boro, S. Bhattacharjee
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引用次数: 0

摘要

采用湿化学沉淀法合成了聚乙烯醇(PVA)包封的硒化镉(CdSe)和硒化镉/氧化锌(CdSe/ZnO)芯壳半导体/半导体纳米颗粒。每种溶液的pH值在9.5 ~ 11.5之间变化。利用Brus方程估计了CdSe纳米颗粒的粒径。紫外可见光谱结果表明,核壳样品的吸收边在342 ~ 377 nm范围内发生蓝移,而CdSe样品的吸收边在712 nm范围内发生蓝移;核壳样品的吸收边在346 ~ 357 nm范围内发生红移,而核壳样品的吸收边在346 ~ 357 nm范围内发生红移。对于CdSe核心纳米粒子,带隙值在3.70 ~ 3.90 eV之间,大于CdSe主体的1.74 eV。核壳纳米粒子的带隙值在3.75 ~ 3.80 eV之间。通过光致发光光谱得到核的激子发射峰位置在323 nm左右,核/壳样品的激子发射峰位置在324nm左右。XRD谱图显示,CdSe/ZnO样品的平均晶粒尺寸为62 ~ 69 nm, CdSe样品的平均晶粒尺寸为11 ~ 31 nm。从SEM分析中可以看出,岩心和岩心/壳样品大致呈球形。HRTEM分析显示,部分核/壳纳米颗粒的尺寸为3-8 nm,而核/壳纳米颗粒的尺寸为20-50 nm。
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Effect of Variation of pH and Shell Thickness upon the Optical and Structural Characteristics of PVA Capped CdSe and CdSe/ZnO Nanoparticles
Poly-Vinyl Alcohol (PVA) capped Cadmium Selenide (CdSe) and Cadmium Selenide/Zinc Oxide (CdSe/ZnO) core/shell semiconductor/semiconductor nanoparticles have been synthesized using wet chemical precipitation method. The pH of each solution was varied ranging from 9.5 to 11.5. Particle size of the CdSe nanoparticles was estimated using Brus Equation. The results of UV-Visible spectroscopy of core CdSe samples show blue shifting of absorption edges in a range of 342-377 nm compared to that of the bulk CdSe 712 nm and red shifting of the absorption edges of the core /shell samples in a range (346-357) nm in comparison to the core sample, over which the shell is deposited. For CdSe core nanoparticles, the band gap values were found to be in the range of 3.70–3.90 eV, which is larger than the bulk CdSe of 1.74 eV. Also the band gap values for the core/shell nanoparticles were in the range of 3.75-3.80 eV. The positions of excitonic emission peak obtained from photoluminescence spectra for the core is around 323 nm and for the core/shell samples is around 324nm. The average crystallite size of the core/shell CdSe/ZnO sample was obtained from XRD spectra in the range of 62-69 nm and for the core CdSe sample it was of 11-31 nm. The core and the core/shell samples were more or less spherical as obtained from the SEM analysis. Some of the core nanoparticles were 3-8 nm in size whereas the core/shell nanoparticles were 20-50 nm in size as obtained from HRTEM analysis.
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期刊介绍: The Indian Society for Surface Science and Technology is an organization for the cultivation, interaction and dissemination of knowledge in the field of surface science and technology. It also strives to promote Industry-Academia interaction
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