Effect of the pore size of TiO₂ porous film on humidity sensitive properties of TiO₂/NaPSS composite films

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• 作者：Aihua  ; Sun  ; ;   ; ^{sunaihua@nimte.ac.cn} ; Huihua  ; Huang ; Chengyi  ; Chu ; Yong  ; Li[Author vitae]
• 关键词：Humidity sensor ; Composite film ; Polystyrene sulfonic sodium ; TiO₂
• 刊名：Sensors and Actuators B: Chemical
• 出版年：2011
• 出版时间：15 December 2011
• 年：2011
• 卷：160
• 期：1
• 页码：1335-1339
• 全文大小：1167 K

文摘

TiO₂ and polystyrene sulfonic sodium (NaPSS) composite film humidity sensors were fabricated via dip-coating method on the alumina substrate. The effect of the pore size of TiO₂ porous film on humidity sensing properties was investigated in this study. Surface morphology of these films was measured by field emission scanning electron microscope (FESEM) and atomic force microscopy (AFM). The different morphology of these films was observed when the pore size of TiO₂ porous film was varied from 4500 nm to 100 nm. The impedance measurements were done with a LCR analyzer. Remarkable variations of the impedance of the composite film humidity sensors were observed by changing the pore size of TiO₂ porous film.