Effect of annealing atmosphere with different oxygen concentration on CO gas sensing performances for CeO_2 nanoparticles

摘要

CeO2 nanoparticles (CeO2 NPs) were synthesized by hydrothermal method and subsequently annealed in different oxygen concentration atmosphere (N-2, air and O-2), which made various crystal planes exposed and induced oxygen vacancies. CO gas sensing tests showed that CeO2 annealed under O-2 exhibited the highest response and fast response/recovery time, which may be contributed to the exposed low index crystal planes and abundant oxygen vacancies. (c) 2020 Elsevier B.V. All rights reserved.