溶胶-凝胶法制备TiO2纳米颗粒的带隙和粒径估算

2014 International Conference on Advances in Communication and Computing Technologies (ICACACT 2014) Pub Date : 2015-09-03 DOI:10.1109/EIC.2015.7230747

M. Karkare

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引用次数: 11

摘要

本研究采用溶胶-凝胶法制备二氧化钛纳米颗粒。以异丙醇钛为前驱体，加入盐酸调节溶液pH。得到的溶胶在80℃下干燥，在450℃下煅烧3小时。合成的TiO2样品在400 nm以下具有较强的紫外吸收光谱。带隙估计使用(αEphot)^2与Ephot图。结果表明，合成样品的带隙为3.4 eV，比散装TiO2的带隙大3.2 eV。对样品进行了XRD分析，并用Scherrer公式计算了晶体尺寸。扫描电镜图像证实了合成颗粒的纳米尺寸。

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Estimation of band gap and particle size of TiO2 nanoparticle synthesized using sol gel technique

In this study, a sol-gel method was used to obtain titanium dioxide nanoparticles. Titanium isopropoxide was used as a precursor and Hydrochloric acid was added to adjust the pH of the solution. The sol obtained was dried at 80°C and calcined at 450°C for 3hrs. The UV absorption spectra of synthesized TiO2 sample exhibited strong absorptions below 400 nm. The band gap is estimated using the (αEphot)^2 versus Ephot plots. The band gap was found to be 3.4 eV for the synthesized sample which was larger than 3.2 eV for bulk TiO2. Also XRD analysis was carried out for the sample and the crystal size was calculated by Scherrer's formula. The Scanning Electron Microscope images confirmed the nano size of synthesized particle.

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2014 International Conference on Advances in Communication and Computing Technologies (ICACACT 2014)

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