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Title:Effect of gamma irradiation on Schottky-contacted vertically aligned ZnO nanorod-based hydrogen sensor
Authors:ID Ranwa, Sapana, Department of Electrical Engineering, Indian Institute of Technology Jodhpur, Jodhpur-342011, India (Author)
ID Barala, Surendra Singh, Department of Electrical Engineering, Indian Institute of Technology Jodhpur, Jodhpur-342011, India and Defence Laboratory, Jodhpur 342011, India (Author)
ID Fanetti, Mattia, Materials Research Laboratory, University of Nova Gorica, Vipavska 11c SI-5270 Ajdovšcina, Slovenia (Author)
ID Kumar, Mahesh, Department of Electrical Engineering, Indian Institute of Technology Jodhpur, Jodhpur-342011, India (Author)
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Work type:Not categorized
Typology: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:345502, 27
PID:20.500.12556/RUNG-2888-dcaf5e62-7dd1-f27c-a193-23b65dfc2acc New window
COBISS.SI-ID:4632571 New window
DOI:10.1088/0957-4484/27/34/345502 New window
Publication date in RUNG:12.01.2017
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Shortened title:Nanotechnology
Publisher:IOP Publishing: Hybrid Open Access
Year of publishing:2016