Journal article
Oxygen Vacancies Engineering in Thick Semiconductor Films via Deep Ultraviolet Photoactivation for Selective and Sensitive Gas Sensing
ZU Abideen, JG Choi, JA Yuwono, A Kiy, PV Kumar, K Murugappan, WJ Lee, P Kluth, DR Nisbet, T Tran-Phu, MH Yoon, A Tricoli
Advanced Electronic Materials | Published : 2023
Abstract
Room-temperature detection of volatile organic compounds in particle-per-billion 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 dept..
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Awarded by North Atlantic Treaty Organization
Funding Acknowledgements
This research was funded by and has been delivered in partnership with Our Health in Our Hands (OHIOH), a strategic initiative of the Australian National University, which aims to transform healthcare by developing new personalized health technologies and solutions in collaboration with patients, clinicians, and health care providers. A.T. gratefully acknowledges financial support from the North Atlantic Treaty Organization (NATO) Science for Peace and Security Programme project AMOXES (#G5634) and ARENA (#AS008). A.T. also acknowledges the support of an Australian Research Council Future Fellowship (FT200100939) and DP190101864. D.R.N was supported by an NHMRC Research Leadership Fellowship GNT1135657. This research was partially supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (No. NRF-2018M3A7B4070988, NRF-2020M1A2A2080748), and GIST Research Institute (GRI) grant by GIST in 2022. The authors acknowledge the facilities and the scientific and technical assistance of Microscopy Australia at the Centre for Advanced Microscopy, Australian National University, a facility that is funded by the University and the Federal Government. Z.U.A. is grateful to Dr. Hongjun Chen, Dr. Zelio Fusco, Dr. Felipe Kremer, and Dr. Borui Liu for useful discussions. Z.U.A. performed materials synthesis, characterization, gas sensing experiments, data analysis, and wrote the manuscript. J.-G.C. and W.-J.L. conducted DUV photoactivation treatments, XPS measurements, and contributed to manuscript writing. T.T-P. contributed to data analysis, DFT calculations, and manuscript writing. K.M. contributed to the data analysis of sensing experiments. P.K. and J.Y. performed DFT calculations. A.K. and P.K. conducted SAXS measurements. A.T., D.R.N., and M.-H.Y. supervised the project and designed the experimental frameworks. All authors contributed to the discussion of the results and revision of the manuscript.