Probing gas response of pure and Au modified ZnO nanowires network using work function measurements

Preetam K. Sharma, Niranjan S. Ramgir, N. Datta, M. Kaur, C. P. Goyal, S. Kailasaganapathi, A. K. Debnath, D. K. Aswal, S. K. Gupta

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

Work function of the material is a strong indicator of the state of a surface and its surrounding. Au being an excellent promoter for H2S, work function changes of pure and Au modified ZnO network films upon exposure to gas have been investigated using Kelvin probe method. Au modified ZnO sample exhibited a work function of 5.42 eV which is ∼320 meV higher than that of pure ZnO sample (5.10 eV). This increase could be attributed to the nano-Schottky type of barrier junction formed between Au and ZnO nanowires. Exposure to H2S resulted in decrease of work function for both pure and Au modified ZnO NWs network films. H2S being reducing in nature, this decrease can be accounted on the basis of Fermi level shift due to large number of electrons that the gas donates to the matrix upon interaction with adsorbed oxygen species.

Original languageEnglish
Title of host publicationSolid State Physics - Proceedings of the 57th DAE Solid State Physics Symposium 2012
PublisherAmerican Institute of Physics Inc.
Pages346-347
Number of pages2
Volume1512
ISBN (Print)9780735411333
DOIs
Publication statusPublished - 15 Mar 2013
Event57th DAE Solid State Physics Symposium 2012 - Bombay, Mumbai, India
Duration: 3 Dec 20127 Dec 2012

Conference

Conference57th DAE Solid State Physics Symposium 2012
CountryIndia
CityBombay, Mumbai
Period3/12/127/12/12

Keywords

  • Au
  • HS
  • nanowire
  • work function
  • ZnO

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    Sharma, P. K., Ramgir, N. S., Datta, N., Kaur, M., Goyal, C. P., Kailasaganapathi, S., Debnath, A. K., Aswal, D. K., & Gupta, S. K. (2013). Probing gas response of pure and Au modified ZnO nanowires network using work function measurements. In Solid State Physics - Proceedings of the 57th DAE Solid State Physics Symposium 2012 (Vol. 1512, pp. 346-347). American Institute of Physics Inc.. https://doi.org/10.1063/1.4791053