Formaldehyde-sensing properties of LaFeO3 particles synthesized by citrate sol–gel method

• Published in: Journal of sol-gel science and technology 2016-07, Vol.79 (1), p.167-175
• Main Authors: Zhang, Yong, Jiang, Bin, Yuan, Mengjiao, Li, Peiwen, Li, Wei, Zheng, Xuejun
• Format: Article
• Language: English
• Subjects: Ceramics; Chemistry and Materials Science; Composites; Correlation coefficients; Ferrites; Formaldehyde; Gas sensors; Glass; Inorganic Chemistry; Lanthanum compounds; Materials Science; Microscopy; Nanotechnology; Natural Materials; Operating temperature; Optical and Electronic Materials; Original Paper: Sol-gel and hybrid materials for catalytic; photoelectrochemical and sensor applications; Photoelectrons; Pore size; Porosity; Power consumption; Recovery time; Response time; Scanning electron microscopy; Selectivity; Sensors; Sol-gel processes; Synthesis; Transmission electron microscopy; X-ray diffraction
• ISSN: 0928-0707; 1573-4846
• DOI: 10.1007/s10971-016-4025-0

LaFeO 3 (LFO) particles were synthesized by citrate sol–gel method and characterized by X-ray diffraction, field-emission scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy and specific surface and pore size analysis instrument. To investigate the formaldehyde (HCHO)-sensing properties, the side-heating gas sensor based on LFO particles was fabricated. The LFO particle-based gas sensor presented high response and good selectivity to HCHO at an operating temperature of 100 °C. At the range of 1–50 ppm HCHO, the LFO particle-based gas sensor exhibits a nearly linear response, and the linear correlation coefficient is 0.99. The response time and recovery time are about 33 and 27 s, respectively. The results indicate that LFO particles synthesized by citrate sol–gel method have potential applications for fabricating high-performance and low power consumption HCHO gas sensor. Graphical Abstract