Department of Physics, M V J College of Engineering, Bangalore, India.
Spectrochim Acta A Mol Biomol Spectrosc. 2010 Mar;75(3):1073-7. doi: 10.1016/j.saa.2009.12.057. Epub 2009 Dec 29.
Titanium dioxide thin films have been synthesized by sol-gel spin coating technique on glass and silicon substrates with and without surfactant polyethylene glycol (PEG). XRD and SEM results confirm the presence of nano-crystalline (anatase) phase at an annealing temperature of 300 degrees C. The influence of surfactant and annealing temperature on optical properties of TiO(2) thin films has been studied. Optical constants and film thickness were estimated by Swanepoel's (envelope) method and by ellipsometric measurements in the visible spectral range. The optical transmittance and reflectance were found to decrease with an increase in PEG percentage. Refractive index of the films decreased and film thickness increased with the increase in percentage of surfactant. The refractive index of the un-doped TiO(2) films was estimated at different annealing temperatures and it has increased with the increasing annealing temperature. The optical band gap of pure TiO(2) films was estimated by Tauc's method at different annealing temperature.
通过溶胶-凝胶旋涂技术在玻璃和硅衬底上合成了二氧化钛薄膜，其中包括和不包括表面活性剂聚乙二醇（PEG）。XRD 和 SEM 结果证实，在 300°C 的退火温度下存在纳米晶（锐钛矿）相。研究了表面活性剂和退火温度对 TiO(2)薄膜光学性质的影响。通过 Swanepoel （包络）方法和在可见光谱范围内的椭偏测量来估算光学常数和薄膜厚度。随着 PEG 百分比的增加，光透过率和反射率降低。随着表面活性剂百分比的增加，薄膜的折射率降低，厚度增加。在不同的退火温度下估算了未掺杂 TiO(2)薄膜的折射率，随着退火温度的升高而增加。通过 Tauc 法在不同的退火温度下估算了纯 TiO(2)薄膜的光学带隙。
