Crystallization and Optical Behaviour of Nanocomposite Sol-Gel TiO₂:Ag Films.

IF 4.2 2区化学 Q2 BIOCHEMISTRY & MOLECULAR BIOLOGY Molecules Pub Date : 2024-10-31 DOI:10.3390/molecules29215156

Tatyana Ivanova, Antoaneta Harizanova, Tatyana Koutzarova, Raphael Closset

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Abstract

Sol-gel spin coating method was employed for depositing TiO₂ and Ag-doped TiO₂ films. The effects of Ag doping and the annealing temperatures (300-600 °C) were studied with respect to their structural, morphological, vibrational, and optical properties. Field Emission Scanning Electron microscopy (FESEM) investigation exhibited the grained, compact structures of TiO₂-based films. Ag incorporation resulted in a rougher film surface. X-ray diffraction (XRD) results confirmed the formation of Ag nanoparticles and AgO phase, along with anatase and rutile TiO₂, strongly depending on Ag concentration and technological conditions. AgO fraction diminished after high temperature annealing above 500 °C. The vibrational properties were characterized by Fourier Transform Infrared (FTIR) spectroscopy. It was found that silver presence induced changes in IR bands of TiO₂ films. UV-VIS spectroscopy revealed that the embedment of Ag NPs in titania matrix resulted in higher absorbance across the visible spectral range due to local surface plasmon resonance (LSPR). Ag doping reduced the optical band gap of sol-gel TiO₂ films. The optical and plasmonic modifications of TiO₂:Ag thin films by the number of layers and different technological conditions (thermal and UV treatment) are discussed.

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纳米复合溶胶凝胶 TiO2:Ag 薄膜的结晶和光学行为。

采用溶胶-凝胶旋涂法沉积二氧化钛和掺杂银的二氧化钛薄膜。研究了 Ag 掺杂和退火温度（300-600 °C）对其结构、形态、振动和光学特性的影响。场发射扫描电子显微镜（FESEM）研究表明，基于二氧化钛的薄膜具有颗粒状的紧凑结构。银的加入使薄膜表面更加粗糙。X 射线衍射 (XRD) 结果证实，Ag 纳米颗粒和 AgO 相的形成，以及锐钛型和金红石型 TiO2 的形成，在很大程度上取决于 Ag 浓度和技术条件。在 500 ℃ 以上高温退火后，AgO 部分减少。傅立叶变换红外光谱（FTIR）对振动特性进行了表征。结果发现，银的存在引起了二氧化钛薄膜红外波段的变化。紫外-可见光谱显示，由于局部表面等离子体共振（LSPR）的作用，银纳米粒子嵌入二氧化钛基体后，在可见光谱范围内的吸光度更高。银掺杂降低了溶胶凝胶二氧化钛薄膜的光带隙。讨论了层数和不同技术条件（热处理和紫外线处理）对 TiO2：Ag 薄膜的光学和等离子修饰。

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来源期刊

Molecules 化学-有机化学

CiteScore

7.40

自引率

8.70%

发文量

7524

审稿时长

1.4 months

期刊介绍： Molecules (ISSN 1420-3049, CODEN: MOLEFW) is an open access journal of synthetic organic chemistry and natural product chemistry. All articles are peer-reviewed and published continously upon acceptance. Molecules is published by MDPI, Basel, Switzerland. Our aim is to encourage chemists to publish as much as possible their experimental detail, particularly synthetic procedures and characterization information. There is no restriction on the length of the experimental section. In addition, availability of compound samples is published and considered as important information. Authors are encouraged to register or deposit their chemical samples through the non-profit international organization Molecular Diversity Preservation International (MDPI). Molecules has been launched in 1996 to preserve and exploit molecular diversity of both, chemical information and chemical substances.