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Electronic sensitization of the response to C2H5OH of p-type NiO nanofibers by Fe doping.
- Source :
-
Nanotechnology . 11/8/2013, Vol. 24 Issue 44, p444005-444012. 8p. - Publication Year :
- 2013
-
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. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09574484
- Volume :
- 24
- Issue :
- 44
- Database :
- Academic Search Index
- Journal :
- Nanotechnology
- Publication Type :
- Academic Journal
- Accession number :
- 94291728
- Full Text :
- https://doi.org/10.1088/0957-4484/24/44/444005