▎ 摘　　要

Graphene (G) was prepared by reducing graphene oxide (GO) with hydrazine hydrate. SnO-graphene composites with different amounts of graphene were prepared via hydrothermal method. SnO-G composites were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The effects of the graphene content in the composites and the hydrothermal temperature on the gas-sensing responses of the materials to formaldehyde vapor were investigated. The gas-sensing selectivity of the sensor based on SnO-1% G (100 degrees C, 10 h) composite to five kinds of gases (1000 x 10(-6)) was also studied. The results revealed that the sensor based on SnO-1% G (100 degrees C, 10 h) exhibited high response to formaldehyde vapor when the operating temperature of the sensor was 133 degrees C and the response to 0.001 x 10(-6) formaldehyde attained 3.9. The response time and recovery time for 0.001 x 10(-6) formaldehyde were 24 and 12 s, respectively. Copyright (C) 2015, The editorial office of Journal of Materials Science & Technology. Published by Elsevier Limited. All rights reserved.