Acetone sensing properties of reduced graphene oxide-CdFe2O4 composites prepared by hydrothermal method

Reduced graphene oxide (RGO)-CdFe2O4 composites with different amounts of RGO (0, 0.1, 0.5, 1, 2 and 3 wt%) were prepared via a hydrothermal method at 180 degrees C for 12 h. The as-prepared RGO-CdFe2O4 composites were characterized by X-ray diffraction (XRD), Thermogravimetric analysis (TGA), Fourier transform infrared spectra (FT-IR), Scanning electron microscopy (SEM), N-2 adsorption-desorption and Raman spectroscopy, respectively. The effect of the amount of RGO in the composites on the gas-sensing responses and the gas-sensing selectivity of the materials was investigated. The experimental results revealed that the sensor based on 1 wt% RGO-CdFe2O4 composite (180 degrees C, 12 h) exhibited high response and good selectivity to acetone vapor, and the response to 1000 ppm and 0.01 ppm acetone vapor attained 1069.0 and 2.0 when operating at 270 degrees C, respectively. The response time and recovery time for 0.01 ppm acetone vapor were only 5 s and 3 s, respectively. (C) 2015 Published by Elsevier Ltd.