Highly sensitive acetone sensors based on flame-spray-made La<inf>2</inf>O<inf>3</inf>-doped SnO<inf>2</inf>nanoparticulate thick films

• Main Authors: N. Tammanoon, A. Wisitsoraat, D. Phokharatkul, A. Tuantranont, S. Phanichphant, V. Yordsri, C. Liewhiran
• Format: Journal
• Published: 2018
• Online Access: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85041663216&origin=inward; http://cmuir.cmu.ac.th/jspui/handle/6653943832/48383
• Institution: Chiang Mai University

© 2018 Elsevier B.V. In the present work, flame-spray-made La 2 O 3 -doped SnO 2 nanoparticles with 0.1−2 wt% La contents were systematically studied for acetone detection. The particle and sensing film properties were characterized by X-ray diffraction, nitrogen adsorption, electron microscopy, energy dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy. The sensing films were tested towards 0.1–400 ppm acetone at operating temperatures ranging from 150 to 400 °C in dry air. Gas-sensing results demonstrated that the SnO 2 sensing film with the optimal La content of 0.5 wt% exhibited a very high response of 3626 toward 400 ppm acetone with a short response time of 2.8 s at the optimal operating temperature of 350 °C. Moreover, the sensors displayed high acetone selectivity against SO 2 , H 2 S, NO 2 , C 6 H 6 , C 7 H 8 , C 8 H 10 and CH 2 O. Therefore, the La 2 O 3 -doped SnO 2 sensors are promising for sensitive and selective detections of acetone at low concentrations.