Journal ArticleDOI
Effect of gamma irradiation on Schottky-contacted vertically aligned ZnO nanorod-based hydrogen sensor.
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.
Journal ArticleDOI
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.
Journal ArticleDOI
Review—Resistive-Type Hydrogen Sensors Based on Zinc Oxide Nanostructures
Journal ArticleDOI
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.
Journal ArticleDOI
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
Fabrication and Characterization of ZnO Single Nanowire-Based Hydrogen Sensor
TL;DR: In this article, the Schottky barrier height of 0.42 V and ideality factor of 1.6 at room temperature was obtained for a single ZnO nanowire with a response time of ∼55 s.
Journal ArticleDOI
Developments in gas sensor technology for hydrogen safety
TL;DR: In this article, Gas sensors are applied for facilitating the safe use of hydrogen in, for example, fuel cell and hydrogen fuelled vehicles, and the strategy of combining different detection principles, i.e., sensors based on electrochemical cells, semiconductors or field effects in combination with thermal conductivity sensing or catalytic combustion elements, in one new measuring system is reported.
Journal ArticleDOI
Radiation technologies: past, present and future
TL;DR: The International Atomic Energy Agency (the Agency) has been involved in the support of projects related to the application of radiation technology for many years as mentioned in this paper, and due to its assistance, advanced radiation processing centers were established in many countries.
Journal ArticleDOI
Surface passivation effect on the photoluminescence of ZnO nanorods.
TL;DR: It was confirmed that the surface states of the as-grown ZnO nanorod arrays indeed contributed to the deep level emissions and the passivation effect was confirmed by the changes of the O 1s and Zn 2p spectra.
Journal ArticleDOI
Advances in Hydrogen, Carbon Dioxide, and Hydrocarbon Gas Sensor Technology Using GaN and ZnO-Based Devices.
Travis J. Anderson,Fan Ren,Stephen J. Pearton,B. S. Kang,Hung-Ta Wang,Chih-Yang Chang,Jenshan Lin +6 more
TL;DR: ZnO nanowires are particularly interesting because they have a large surface area to volume ratio, which will improve sensitivity, and because they operate at low current levels, will have low power requirements in a sensor module.
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