Optical properties and sensing applications of lithium iron phosphate thin films

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作   者：

Patima Nizamidin;  Abliz Yimit;  Ji De Wang;  Kiminori Itoh; 

作者机构：

Graduate School of Environment and Information Sciences;  Yokohama 240-8501;  Xinjiang University;  College of Chemistry and Chemical Engineering;  Yokohama National University;  Urumqi 830046;  Japan;  PR China; 

关键词：

lithium iron phosphate;  xylene;  optical waveguide;  gas sensor;  sol-gel deposition;  refractive index;  thin films; 

期刊名称：

Thin Solid Films: An International Journal on the Science and Technology of Thin and Thick Films

i s s n：

0040-6090

年卷期：

2012 年 520 卷 19 期

页   码：

6250-6255

页   码：

摘   要：

A composite optical waveguide sensor, consisting of lithium iron phosphate (LiFeP04, LFP) as the sensing material, was constructed and utilized for the detection of volatile organic compound gases. Nano-LFP powder was prepared via the hydrothermal method and was subsequently utilized in a dip-coating procedure for the fabrication of LFP thin films. The effect of heat treating temperature on the refractive index of the thin films was studied. A glass optical waveguide gas sensor was fabricated by coating an LFP thin film on the surface of single-mode tin-diffused glass optical waveguide. The sensor was found to exhibit a linear response to xylene in the range of 50-1000 ppm, with response times of less than 5 s.