Preparation and Property of Lanthanum Ferrite Formaldehyde Gas Sensor Modified by Carbon Nanotubes and Silver

Yu Min Zhang; Yu Tao Lin; Jin Zhang; Zhong Qi Zhu; Qiang Liu; Qing Ju Liu

doi:10.4028/www.scientific.net/AMM.320.554

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 320Preparation and Property of Lanthanum Ferrite...

Preparation and Property of Lanthanum Ferrite Formaldehyde Gas Sensor Modified by Carbon Nanotubes and Silver

Abstract:

Our previous study revealed that the gas sensitive property of Silver-modified Lanthanum Ferrite (Ag-LaFeO₃) is well, but the operating temperature is still high and the sensitivity also needs to be improved. This work based on our previous study. Ag-LaFeO₃was further modified by the Carbon nanoTubes (CNTs). The Ag-LaFeO₃powder modified with CNTs (CNTs-Ag-LaFeO₃) was prepared by a sol-gel method combined with microwave chemical synthesis. The structure and gas-sensing properties were investigated. The results show that the structure of CNTs-Ag-LaFeO₃is of orthogonal perovskite. The sensitivity of 0.75% CNTs-Ag-LaFeO₃ powder for 1 ppm formaldehyde is 13 at 86°C. The response and recovery time are 100s and 60s, respectively. Moreover, the sensor also has an obvious response for 1ppm formaldehyde at 58°C.

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Periodical:

Applied Mechanics and Materials (Volume 320)

Pages:

554-557

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.320.554

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Online since:

May 2013

Authors:

Yu Min Zhang, Yu Tao Lin, Jin Zhang, Zhong Qi Zhu, Qiang Liu, Qing Ju Liu

Keywords:

Carbon Nanotube (CN), Gas Sensor, LaFeO₃

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