溶胶老化对SnO2纳米颗粒及薄膜结构和光学性能的影响

IF 3.9 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: B Pub Date : 2025-05-14 DOI:10.1016/j.mseb.2025.118395

Vahdat Rafee , Alireza Razeghizadeh , Iraj Kazeminezhad , Leyla Zalaghi

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引用次数: 0

摘要

研究了溶胶老化对溶胶-凝胶法制备的二氧化锡纳米粒子及其薄膜结构和光学性能的影响。为此，将0.1 M的SnO2纳米颗粒溶胶老化1、8、15和22天。随后，采用浸涂技术制备薄膜。利用x射线衍射仪（XRD）和扫描电镜（SEM）对纳米颗粒和薄膜的结构和形貌进行了分析。XRD结果表明，纳米晶体呈四边形结构。此外，计算表明，随着溶胶老化时间的延长，纳米颗粒和薄膜的平均纳米晶体尺寸都增加。SEM分析证实了XRD的发现，表明延长时效导致薄膜样品的纳米晶体变大，颗粒边界减小。能量色散x射线光谱（EDAX）证实了锡和氧元素的存在。此外，傅里叶变换红外光谱（FTIR）验证了预期的化学键。紫外可见吸收光谱表明，在纳米颗粒样品中，增加老化时间导致更高的吸收和减小的光学带隙。因此，纳米颗粒样品的光学带隙从4.05 eV减小到3.95 eV，薄膜样品的光学带隙从4.48 eV减小到4.30 eV。此外，在薄膜样品中，延长老化导致透光率降低，反射率增加，光学带隙减小。这些结果表明，溶胶老化会显著影响SnO2材料的光学和结构特性，这在气体传感器、太阳能电池和光电子器件等应用中至关重要。更好地了解溶胶老化过程也有助于优化合成方法和提高这些材料在工业应用中的性能。

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Effect of Sol aging on the structural and optical properties of tin dioxide (SnO2) nanoparticles and thin films

This study investigated the effect of sol aging on the structural and optical properties of tin dioxide (SnO₂) nanoparticles and thin films prepared via the sol–gel method. For this purpose, a 0.1 M sol of SnO₂ nanoparticles was aged for 1, 8, 15, and 22 days. Subsequently, thin films were fabricated using the dip-coating technique. The structure and morphology of the nanoparticles and thin films were analyzed using X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. XRD results revealed that the nanocrystals exhibited a tetragonal structure. Additionally, calculations indicated that the average nanocrystal size in both nanoparticles and thin films increased with longer sol aging times. SEM analysis confirmed the XRD findings, showing that prolonged aging resulted in larger nanocrystals, reduced particle boundaries in thin-film samples. Energy-dispersive X-ray spectroscopy (EDAX) confirmed the presence of tin and oxygen elements. Furthermore, Fourier transform infrared spectroscopy (FTIR) verified the expected chemical bonds. UV–Vis absorption spectra demonstrated that, in nanoparticle samples, increased aging time led to higher absorption and a reduced optical band gap. Such that, for the nanoparticle samples, the optical band gap decreased from 4.05 eV to 3.95 eV, and for the thin-film samples, it decreased from 4.48 eV to 4.30 eV. Also, in thin-film samples, prolonged aging resulted in decreased transmittance, increased reflectance, and a reduced optical band gap. These results demonstrate that sol aging can significantly impact the optical and structural properties of SnO₂ materials, which could be crucial in applications such as gas sensors, solar cells, and optoelectronic devices. A better understanding of the sol aging process could also contribute to optimizing synthesis methods and improving the performance of these materials in industrial applications.

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来源期刊

Materials Science and Engineering: B 工程技术-材料科学：综合

CiteScore

5.60

自引率

2.80%

发文量

481

审稿时长

3.5 months

期刊介绍： The journal provides an international medium for the publication of theoretical and experimental studies and reviews related to the electronic, electrochemical, ionic, magnetic, optical, and biosensing properties of solid state materials in bulk, thin film and particulate forms. Papers dealing with synthesis, processing, characterization, structure, physical properties and computational aspects of nano-crystalline, crystalline, amorphous and glassy forms of ceramics, semiconductors, layered insertion compounds, low-dimensional compounds and systems, fast-ion conductors, polymers and dielectrics are viewed as suitable for publication. Articles focused on nano-structured aspects of these advanced solid-state materials will also be considered suitable.