Excellent Methanol Sensing Performance of Gas Sensor Based on Ag-LaFeO3 Modified with Graphene

Ag-LaFeO₃ (ALFO) was prepared using a sol-gel method combined with the microwave chemical synthesis. The ALFO were further modified by graphene (G-ALFO) with different weight ratio (0.50%, 0.75% and 1.00%). The composite material of G-ALFO was characterized using X-ray powder diffraction (XRD), transmission electron microscopy (TEM), Brunauer-Emmett-Teller (BET), Fourier transform infrared spectroscopy (FT-IR) and Raman spectrum to examine the morphology, microstructure and surface area. The 0.75% G-ALFO (0.75% are the weight ratio of G to ALFO) shows excellent selectivity and good response to methanol. The responses to 5 ppm methanol and the optimal operating temperature of 0.75% G-ALFO are 51 and 102°C, and a lower response (≤ 15) to other test gases including formaldehyde, acetone, ethanol, ammonia, gasoline and benzene was measured, respectively. The results showed that the 0.75% G-ALFO composite possesses high response, low operating temperature and good selectivity to methanol.

Author(s): Rong Q, Zi BY, Hu JC, Zhang YM, Zhu ZQ, Zhang J and Liu QJ

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