Journal ArticleDOI
Effect of gamma irradiation on Schottky-contacted vertically aligned ZnO nanorod-based hydrogen sensor.
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TLDR
The impact of gamma irradiation on the performance of a gold Schottky-contacted ZnO nanorod-based hydrogen sensor is reported and the relative response of the hydrogen sensor was enhanced by ∼14.9% with respect to pristine ZNO using 1 kGy gamma ray treatment.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.read more
Citations
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Enhanced sensing performance of ZnO nanostructures-based gas sensors: A review
TL;DR: In this paper, several techniques related to the synthesis of ZnO nanostructures and their efficient performance in sensing are reviewed, such as functionalization of noble metal nanoparticles, doping of metals, inclusion of carbonaceous nanomaterials, using nanocomposites of different MO x, UV activation, and post-treatment method of high-energy irradiation on ZnOs, with their possible sensing mechanisms.
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Hydrogen gas sensor based on mesoporous In2O3 with fast response/recovery and ppb level detection limit
Zhijie Li,Shengnan Yan,Zhonglin Wu,Hao Li,Junqiang Wang,Wenzhong Shen,Zhiguo Wang,Yong Qing Fu +7 more
TL;DR: In this article, the mesoporous In2O3 sensors exhibited good reversibility and repeatability towards hydrogen gas and showed a good selectivity for hydrogen compared to other commonly investigated gases including NH3, CO, ethyl alcohol, styrene, CH2Cl2 and formaldehyde.
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Review—Resistive-Type Hydrogen Sensors Based on Zinc Oxide Nanostructures
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Optimization of the CVD parameters for ZnO nanorods growth: Its photoluminescence and field emission properties
TL;DR: In this paper, a vertically aligned single crystalline ZnO nanorods arrays were grown on a silicon substrate in a CVD reactor using Au as a catalyst, and the structural and morphological properties of the resulting nanorod arrays were studied by means of X-ray diffraction, high-resolution transmission electron microscopy, selected area electron diffraction and field emission scanning microscopy.
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Holey engineered 2D ZnO-nanosheets architecture for supersensitive ppm level H2 gas detection at room temperature
Manjeet Kumar,Vishwa Bhatt,Joondong Kim,Ashutosh C. Abhyankar,Hak-Jun Chung,Kulvir Singh,Young Bin Cho,Young Jun Yun,Kwang Soo Lim,Ju-Hyung Yun +9 more
TL;DR: In this article, a strategy is proposed to synthesize 2D ZnO holey nanosheets by engineering the tunable pore/hole size with controlled oxygen vacancies using the annealing process for H2 detection at room temperature.
References
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Journal ArticleDOI
Defect-free ZnO nanorods for low temperature hydrogen sensor applications
TL;DR: In this paper, a H2 sensing mechanism based on the change in physical dimension of channel is proposed to explain the fast response and recovery times of ZnO NRs/Si/ZnONRs sensors.
Journal ArticleDOI
Gamma ray irradiated AgFeO 2 nanoparticles with enhanced gas sensor properties
TL;DR: In this paper, a facile hydrothermal method was used to synthesize and irradiate AgFeOsub 2 nanoparticles with gamma ray to improve the performance of a gas sensor.
Journal ArticleDOI
Effect of Gamma Irradiation on the Structural and Optical Properties of ZnO Thin Films
TL;DR: In this paper, the effect of gamma (γ)-irradiation on the structure and optical properties of ZnO thin films was investigated, and the crystal structure and orientation of the films were studded by XRD pattern.
Journal ArticleDOI
Schottky-contacted vertically self-aligned ZnO nanorods for hydrogen gas nanosensor applications
TL;DR: In this article, the authors used RF magnetron sputtering technique to grow ZnO nanorods on Si(100) substrate using X-ray diffraction to obtain high crystalline and optical quality of ZnOs and very low defect density.
ReportDOI
A Short History of Hanford Waste Generation, Storage, and Release
TL;DR: Hanford contains about 40% of all the radioactivity that exists across the nuclear weapons complex as mentioned in this paper, and most of the human-made radioactivity and about half of the chemicals remaining onsite are kept in underground tanks and surface facilities.
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