High-Performance Ammonia Sensor at Room Temperature Based on a Love-Wave Device with Fe2O3@WO3−x Nanoneedles

F. A. Bahos, S. Vallejos, Isabel Gràcia, C. Cané, M. J. Fernández, M. C. Horrillo and Daniel Matatagui
Proceedings 2017, 1(4), 484

An innovative, simple and inexpensive Love-wave gas sensor based on Fe2O3@WO3−x nanoneedles to detect the variation of ammonia at room temperature was developed. The nanoneedles were successfully formed on Love-wave device via aerosol-assisted chemical vapor deposition (AACVD). The nanoneedles worked as guiding and sensitive layers detecting the changes of the elastic properties presented by ammonia interaction. The sensor was tested to ammonia concentrations between 25 to 90 ppm and showed large frequency shifts, high sensibility, short response time and good reproducibility.


This research is supported by project DGAPA-PAPIIT IA-103016 from Universidad Nacional Autónoma de México and the projects TEC-2013-48147 (AEI/FEDER, EU) and TEC2015-74329-JIN (AEI/FEDER, EU) from Ministerio de Economía y Competitividad of Spain. In addition, F. A. Bahos thanks Programa de Posgrado en Ingeniería- UNAM and CONACYT for Master studies grant.