UV-activated room-temperature gas sensing mechanism of polycrystalline ZnO

Shan Wei Fan; Arvind K. Srivastava; Vinayak P. Dravid

doi:10.1063/1.3243458

UV-activated room-temperature gas sensing mechanism of polycrystalline ZnO

Shan Wei Fan^*, Arvind K. Srivastava, Vinayak P. Dravid

^*Corresponding author for this work

Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

333 Scopus citations

Abstract

The effects of UV illumination on the electronic properties and gas sensing performance of ZnO are reported. It is found that UV light improves the sensitivity and the sensor response and recovery rate. By investigating the photoresponse behavior of ZnO, we observe that the electrons generated by UV light promote the adsorption of oxygen and form the photoinduced oxygen ions [O^2- (h_v)]. These ions [O^2- (h_v)] are responsible for the room-temperature gas sensing phenomena and promise enhanced sensor performance through further optimization.

Original language	English (US)
Article number	142106
Journal	Applied Physics Letters
Volume	95
Issue number	14
DOIs	https://doi.org/10.1063/1.3243458
State	Published - 2009

Funding

This research work was primarily supported by U.S.-DOE Award No. DE-FG02-07ER46444. The sensor experimental setup and software/hardware development was initially supported by NSF-NSEC Award No. EEC-0647560. The research was performed in the EPIC facility of NUANCE Center at Northwestern University. NUANCE Center is supported by NSF-NSEC, NSF-MRSEC, Keck Foundation, the State of Illinois, and Northwestern University.

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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title = "UV-activated room-temperature gas sensing mechanism of polycrystalline ZnO",

abstract = "The effects of UV illumination on the electronic properties and gas sensing performance of ZnO are reported. It is found that UV light improves the sensitivity and the sensor response and recovery rate. By investigating the photoresponse behavior of ZnO, we observe that the electrons generated by UV light promote the adsorption of oxygen and form the photoinduced oxygen ions [O2- (hv)]. These ions [O2- (hv)] are responsible for the room-temperature gas sensing phenomena and promise enhanced sensor performance through further optimization.",

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AB - The effects of UV illumination on the electronic properties and gas sensing performance of ZnO are reported. It is found that UV light improves the sensitivity and the sensor response and recovery rate. By investigating the photoresponse behavior of ZnO, we observe that the electrons generated by UV light promote the adsorption of oxygen and form the photoinduced oxygen ions [O2- (hv)]. These ions [O2- (hv)] are responsible for the room-temperature gas sensing phenomena and promise enhanced sensor performance through further optimization.

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UV-activated room-temperature gas sensing mechanism of polycrystalline ZnO

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