Sensing of ammonia gas by undoped and aluminum-doped tin oxide nanoparticles by Raman spectroscopy

Pramana: Journal of physics

K BHUYAN^1¹  A BHATTACHARJEE^2² 

[1] Department of Physics, North Eastern Regional Institute of Science and Technology, Nirjuli 791 109, India^1;National Institute of Technology Meghalaya, Shillong 793 003, India^2

关键词: Tin oxide;    sensing;    raman spectroscopy;   

DOI  :  

学科分类：物理（综合）

来源: Indian Academy of Sciences

【 摘 要 】

The study of gas sensing properties of $\rm{SnO_{2}}$ has been widely carried out mainly using electrical methods where a change in resistance or/and conductance of $\rm{SnO_{2}}$ is measured when it is exposed to the sample. In this work, a spectroscopic approach was employed using Raman intensity as a tool to study the sensing of ammonia by undoped and aluminum-doped $\rm{SnO_{2}}$ nanoparticles. The study showed a variation of intensity of the classical Raman modes of $\rm{SnO_{2}}$, when $\rm{SnO_{2}}$ was exposed to ammonia. The response to ammonia by nanoparticles of different sizes and doping concentrations was calculated. This study also revealed the optimum crystallite size and doping concentration suitable for sensing ammonia. However, the most important conclusion that could be drawn from this study was that the response of $\rm{SnO_{2}}$ to ammonia could be detected at room temperature through Raman spectroscopy unlike in the case of electrical studies, where a high temperature is required for sensing.

【 授权许可】

CC BY