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Electronic sensitization of the response to C2H5OH of p-type NiO nanofibers by Fe doping.

Authors
  • Yoon, Ji-Wook1
  • Kim, Hyo-Joong
  • Kim, Il-Doo
  • Lee, Jong-Heun
  • 1 Department of Materials Science and Engineering, Korea University, Anam-Dong, Seongbuk-Gu, Seoul 136-713, Republic of Korea. , (North Korea)
Type
Published Article
Journal
Nanotechnology
Publisher
IOP Publishing
Publication Date
Nov 08, 2013
Volume
24
Issue
44
Pages
444005–444005
Identifiers
DOI: 10.1088/0957-4484/24/44/444005
PMID: 24113085
Source
Medline
License
Unknown

Abstract

Pure and 0.18-13.2 at.% Fe-doped NiO nanofibers were prepared by electrospinning and their gas sensing characteristics and microstructural evolution were investigated. The responses ((Rg - Ra)/Ra, where Rg is the resistance in gas and Ra is the resistance in air) to 5 ppm C2H5OH, toluene, benzene, p-xylene, HCHO, CO, H2, and NH3 at 350-500 ° C were significantly enhanced by Fe doping of the NiO nanofibers, while the responses of pure NiO nanofibers to all the analyte gases were very low ((Rg - Ra)/Ra = 0.07-0.78). In particular, the response to 100 ppm C2H5OH was enhanced up to 217.86 times by doping of NiO nanofibers with 3.04 at.% Fe. The variation in the gas response was closely dependent upon changes in the base resistance of the sensors in air. The enhanced gas response of Fe-doped NiO nanofibers was explained in relation to electronic sensitization, that is, the increase in the chemoresistive variation due to the decrease in the hole concentration induced by Fe doping.

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