Ppb-Level Xylene Gas Sensors Based on Co3O4 Nanoparticle-Coated Reduced Graphene Oxide(rGO) Nanosheets Operating at Low Temperature. - Fanli Meng; Xiaozhi Li; Zhenyu Yuan; Yanfeng Lei; Tianyao Qi; Jin Li 029 (IEEE Trans. Instrum. Meas., 2021)