Preparation and Characterization of Cerium-doped Tin Oxide Gas Sensors

摘要

In this paper, the precursors were synthesized by microwave hydrothermal method using SnCl_4·5H_2O and Ce(NO_3)_3·6H_2O as raw material, CO(NH_2)_2 as precipitants, respectively. Pure SnO_2 nanoparticles and cerium-doped SnO_2 nanoparticles were obtained. Furthermore, five kinds of SnO_2 thick film gas sensors were fabricated from the above SnO_2 nanoparticles (the sensors denoted as sensor SC0, SC2, SC3, SC4 and SC6, respectively). The experiment results showed that, compared with pure SnO_2 thick film gas sensor, the intrinsic resistance of cerium-doped SnO_2 thick film gas sensors decreased, and their sensor responses to acetone vapor increased, which are discussed in relation to the SEM micrographs of thick film sensors.