▎ 摘　　要

A room temperature formaldehyde sensor with high sensitivity is fabricated using vertical graphene (VG) networks decorated with tin dioxide (SnO2) nanoparticles. VG was directly grown on the sensor electrodes using a microwave plasma-enhanced chemical vapor deposition (MW-PECVD) method. SnO2 nanoparticles were decorated on the VG side planes and edges sparsely and evenly with an electrochemical deposition method. The VG/SnO2 sensor exhibited high responses to low-concentration formaldehyde under room temperature. The low limit of detection (LOD) of VG/SnO2 sensor for formaldehyde sensing is 0.02 ppm. The response time and recovery time were 46 s and 95 s for 5 ppm formaldehyde, respectively. Moreover, the sensor showed excellent selectivity and stability. The mechanism responsible for good sensing performance was analyzed based on the special structure of VG and the synergistic effect between VG and the SnO2 nanoparticles. (C) 2017 Elsevier B.V. All rights reserved.