논문 국내 국제전문학술지(SCI급) The Effect of Noble Metals on Co Gas Sensing Properties of In2O3 Nanoparticles
- 학술지 구분 국제전문학술지(SCI급)
- 게재년월 2021-05
- 저자명 JinAh Hwang, Hyunsung Jung, Hyo-Soon Shin, Dae-Sung Kim, Dong Soo Kim, Byeong-Kwon Ju and MyoungPyo Chun
- 발행처명 MDPI applied sciences
- 발행국가 국내
- 논문언어 한국어
- 전체저자수 7
홈페이지논문 초록 (Abstract)
Three types of In2O3 nanoparticles decorated with Au, Pd and Pt nanoparticles, respectively, were synthesized by thermal decomposition method, and the effects of metal nanoparticles on their phase, microstructure, chemical state, carrier types were investigated with XRD, SEM/TEM, and XPS. Additionally, sensing properties to CO gas, such as sensitivity, etc., were examined with sensing apparatus. Au-decorated In2O3 nanoparticles exhibited the highest sensitivity to CO gas, with S = 5.59 at a 10 ppm CO gas concentration at 50 °C compared to Pd or Pt-decorated In2O3 nanoparticles. This can be interpreted as a much higher adsorption of oxygen molecules on the In2O3 surface due to the high oxygen vacancies in the In2O3 lattice, which generates an electron depletion region in the outer layer of In2O3 to sharply increase the resistance or the spill-over effect due to Au nanoparticles on In2O3. Au nanoparticles were observed in the TEM images and confirmed by XPS analysis.