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https://hdl.handle.net/2440/137726
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Type: | Journal article |
Title: | Oxygen Vacancies Engineering in Thick Semiconductor Films via Deep Ultraviolet Photoactivation for Selective and Sensitive Gas Sensing |
Author: | Abideen, Z.U. Choi, J.-G. Yuwono, J.A.A. Kiy, A. Kumar, P.V. Murugappan, K. Lee, W.-J. Kluth, P. Nisbet, D.R.R. Tran-Phu, T. Yoon, M.-H. Tricoli, A. |
Citation: | Advanced Electronic Materials, 2023; 9(4):2200905-1-2200905-16 |
Publisher: | Wiley |
Issue Date: | 2023 |
ISSN: | 2199-160X 2199-160X |
Statement of Responsibility: | Zain Ul Abideen, Jun-Gyu Choi, Jodie A. Yuwono, Alexander Kiy, Priyank Vijaya Kumar, Krishnan Murugappan, Won-June Lee, Patrick Kluth, David R. Nisbet, Thanh Tran-Phu, Myung-Han Yoon, and Antonio Tricoli |
Abstract: | Room-temperature detection of volatile organic compounds in particle-perbillion concentrations is critical for the development of wearable and distributed sensor networks. However, sensitivity and selectivity are limited at low operating temperatures. Here, a strategy is proposed to substantially improve the performance of semiconductor sensors. Tunable oxygen vacancies in thick 3D networks of metal oxide nanoparticles are engineered using deep ultraviolet photoactivation. High selectivity and sensitivity are achieved by optimizing the electronic structure and surface activity while preserving the 3D morphology. Cross-sectional depth analysis reveals oxygen vacancies present at various depths (≈24% at a depth of 1.13 μm), with a uniform distribution throughout the thick films. This results in ≈58% increase in the sensitivity of ZnO to 20-ppb ethanol at room temperature while ≈51% and 64% decrease in the response and recovery times, respectively. At an operating temperature of 150 °C, oxygenvacant nanostructures achieve a lower limit of detection of 2 ppb. Density functional theory analysis shows that inducing oxygen vacancies reduces activation energy for ethanol adsorption and dissociation, leading to improved sensing performance. This scalable approach has the potential for designing low-power wearable chemical and bio-sensors and tuning the activity and band structure of porous, thick oxide films for multiple applications. |
Keywords: | deep ultraviolet photoactivation; metal oxides; oxygen vacancies; room temperature sensing; volatile organic compounds; ZnO |
Description: | Published April 2023 |
Rights: | © 2023 The Authors. Advanced Electronic Materials published by Wiley-VCH GmbH. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
DOI: | 10.1002/aelm.202200905 |
Grant ID: | http://purl.org/au-research/grants/arc/FT200100939 http://purl.org/au-research/grants/arc/DP190101864 http://purl.org/au-research/grants/nhmrc/GNT1135657 |
Published version: | http://dx.doi.org/10.1002/aelm.202200905 |
Appears in Collections: | Chemical Engineering publications |
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hdl_137726.pdf | Published version | 18.02 MB | Adobe PDF | View/Open |
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