Ambivalent effect of Ni loading on gas sensing performance in SnO2 based gas sensor
- Authors
- Choi, Kwon-Il; Huebner, Michael; Haensch, Alexander; Kim, Hyo-Joong; Weimar, Udo; Barsan, Nicolae; Lee, Jong-Heun
- Issue Date
- 5-7월-2013
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- Ni-loaded SnO2; Gas sensors; Work function; Humidity dependence; Recovery speed
- Citation
- SENSORS AND ACTUATORS B-CHEMICAL, v.183, pp.401 - 410
- Indexed
- SCIE
SCOPUS
- Journal Title
- SENSORS AND ACTUATORS B-CHEMICAL
- Volume
- 183
- Start Page
- 401
- End Page
- 410
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/102718
- DOI
- 10.1016/j.snb.2013.04.007
- ISSN
- 0925-4005
- Abstract
- The gas sensing characteristics of pure and 0.4-2.0 at% Ni-loaded SnO2 nanoparticles have been measured in dry and humid atmospheres. Approximately the same response to 50 ppm CO, response/recovery kinetics, and resistance in air regardless of wide range of humidity variation from dry to 80% r.h. have been accomplished by loading 1.0 and 2.0 at% Ni to SnO2. The role of Ni related surface species in the decrease of humidity dependence of gas sensing characteristics has been elucidated by diffuse-reflectance Fourier transform IR spectroscopy. The work function values determined from the transient of sensor resistance and contact potential difference revealed that Ni loading to SnO2 determines the appearance of surface electron acceptors responsible for a significant upward energy bands bending even in N-2 atmosphere (>0.5 eV), and, ultimately, explains the significant increase of the sensors baseline resistance and the decrease of the sensor signals. In this way, the origins of the ambivalent effect of Ni loading are clarified and the way towards a rational optimization of the sensor performance opened. (C) 2013 Elsevier B.V. All rights reserved.
- Files in This Item
- There are no files associated with this item.
- Appears in
Collections - College of Engineering > Department of Materials Science and Engineering > 1. Journal Articles
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.