退火对四方SnO2纳米晶微观结构和光学性能的影响

IF 2.8 3区化学 Q3 CHEMISTRY, PHYSICAL

Chemical Physics Letters Pub Date : 2025-05-17 DOI:10.1016/j.cplett.2025.142165

Amarjyoti Kalita , Saurabh K. Sharma

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引用次数: 0

摘要

采用化学共沉淀法合成了SnO2纳米晶，并在两种不同温度下进行了退火。通过Rietveld细化和Williamson-Hall （WH）分析估计了微观结构参数。随着退火温度的升高，SnO2纳米晶的晶格应变减小，晶粒尺寸增大，晶格体积增大。通过DFT计算验证了SnO2纳米晶体的实验带隙，并发现带隙随退火温度的升高而减小。光致发光发射表明，SnO2纳米晶体退火后从Sni到VO+的辐射转变路径被完全阻断。

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Effect of annealing on the microstructure and optical properties of tetragonal SnO2 nanocrystals

SnO₂ nanocrystals are synthesized by chemical co-precipitation method and are annealed at two different temperatures. Microstructural parameters are estimated with the help of Rietveld refinement and Williamson-Hall (WH) analysis. Crystallite size as well as lattice volume are observed to be increased while the lattice strain of the SnO₂ nanocrystals is found to be decreased with annealing temperature. The experimental band gap of SnO₂ nanocrystals is verified by DFT calculation and is found to be decreased with annealing temperature. Radiative transition route from Sn_i to V_O⁺ is completely blocked after the annealing of SnO₂ nanocrystals as revealed by the photoluminescence emission.

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来源期刊

Chemical Physics Letters 化学-物理：原子、分子和化学物理

CiteScore

5.70

自引率

3.60%

发文量

798

审稿时长

33 days

期刊介绍： Chemical Physics Letters has an open access mirror journal, Chemical Physics Letters: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. Chemical Physics Letters publishes brief reports on molecules, interfaces, condensed phases, nanomaterials and nanostructures, polymers, biomolecular systems, and energy conversion and storage. Criteria for publication are quality, urgency and impact. Further, experimental results reported in the journal have direct relevance for theory, and theoretical developments or non-routine computations relate directly to experiment. Manuscripts must satisfy these criteria and should not be minor extensions of previous work.