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Title:Effect of gamma irradiation on Schottky-contacted vertically aligned ZnO nanorod-based hydrogen sensor
Authors:Ranwa, Sapana (Author)
Barala, Surendra Singh (Author)
Fanetti, Mattia (Author)
Kumar, Mahesh (Author)
Files:This document has no files. This document may have a phisical copy in the library of the organization, check the status via COBISS. Link is opened in a new window
Language:English
Work type:Not categorized (r6)
Tipology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
Abstract:We report the impact of gamma irradiation on the performance of a gold Schottky-contacted ZnO nanorod-based hydrogen sensor. RF-sputtered vertically aligned highly c-axis-oriented ZnO NRs were grown on Si(100) substrate. X-ray diffraction shows no significant change in crystal structure at low gamma doses from 1 to 5 kGy. As gamma irradiation doses increase to 10 kGy, the single crystalline ZnO structure converts to polycrystalline. The photoluminescence spectra also shows suppression of the near-band emission peak and the huge wide-band spectrum indicates the generation of structural defects at high gamma doses. At 1 kGy, the hydrogen sensor response was enhanced from 67% to 77% for 1% hydrogen in pure argon at a 150 °C operating temperature. However, at 10 kGy, the relative response decreases to 33.5%. High gamma irradiation causes displacement damage and defects in ZnO NRs, and as a result, degrades the sensor's performance as a result. Low gamma irradiation doses activate the ZnO NR surface through ionization, which enhances the sensor performance. The relative response of the hydrogen sensor was enhanced by ∼14.9% with respect to pristine ZnO using 1 kGy gamma ray treatment. © 2016 IOP Publishing Ltd.
Keywords:ZnO, nanorods, gamma irradiation, sensor
Year of publishing:2016
Number of pages:8
Numbering:27, 345502
COBISS_ID:4632571 Link is opened in a new window
URN:URN:SI:UNG:REP:5SNVQ2MG
DOI:10.1088/0957-4484/27/34/345502 Link is opened in a new window
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Record is a part of a journal

Title:Nanotechnology
Shortened title:Nanotechnology
Publisher:IOP Publishing: Hybrid Open Access
ISSN:0957-4484
Year of publishing:2016

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