On the enhancement of ethanol sensing by CuO modified SnO₂ nanoparticles using fiber-optic sensor

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• 作者：R.N. Mariammal^a ; ^{marigayathrirn@yahoo.co.in}  ; [Author Vitae] ; K. Ramachandran^a ; ^{thirumalchandran@gmail.com}  ; [Author Vitae] ; B. Renganathan^b ; ^{b.renga79@gmail.com}  ; [Author Vitae] ; D. Sastikumar^b ; ^{sasti@nitt.edu}  ; [Author Vitae]
• 关键词：Nanocomposite ; SnO2 ; CuO ; Fiber-optic sensor ; Ethanol sensor ; Oxygen adsorption
• 刊名：Sensors and Actuators B ; Chemical
• 出版年：2012
• 期刊代码：161_09254005
• 类别：et
• 出版时间：5 July, 2012
• 卷：169
• 期：Complete
• 页码：199-207
• 文件大小：1736 K

摘要

Ethanol sensitivities of SnO₂ and SnO₂:CuO nanoparticles are studied using a clad-modified fiber-optic sensor. The sensing materials (SnO₂ and SnO₂:CuO) are structurally characterized by X-ray diffraction (XRD) and high-resolution transmission electron microscope (HRTEM) and their crystallite sizes are found to be 10 and 8-20 nm, respectively. The refractive indices of the sensing materials ( and ) found from UV-vis analysis show that the fiber-optic sensor works under leaky mode operation. SnO₂:CuO exhibits higher ethanol sensitivity compared to pure SnO₂. It is found that the addition of CuO into SnO₂ allows the effective formation of more number of oxygen vacancies, heterojunction, and high crystalline nanoparticles, which enhance its sensitivity to about three times than that of pure SnO₂.