期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 31, 页码 35688-35697出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c08593
关键词
metal oxide semiconductor; p-n junction; hybrid nanostructure; acetone detection; ultrasensitive gas sensor
资金
- National Research Foundation of Korea [NRF-2017M3A9F1033056]
- Creative Materials Discovery Program [NRF-2016M3D1A1900035]
- National Research Foundation (NRF) - Ministry of Science and ICT, Republic of Korea [NRF-2018R1A2B3004096, 2018R1A5A1025208]
- National Research Foundation of Korea [21A20151513223] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
This paper presents a ZnO-CuO p-n hetero-junction chemiresistive sensor that comprises CuO hollow nanocubes attached to ZnO spherical cores as active materials. These ZnO-CuO core-hollow cube nanostructures exhibit a remarkable response of 11.14 at 1 ppm acetone and 200 degrees C, which is a superior result to those reported by other metal-oxide-based sensors. The response can be measured up to 40 ppb, and the limit of detection is estimated as 9 ppb. ZnO-CuO core-hollow cube nanostructures also present high selectivity toward acetone against other volatile organic compounds and demonstrate excellent stability for up to 40 days. The outstanding gas-sensing performance of the developed nanocubes is attributed to their uniform and unique morphology. Their core-shell-like structures allow the main charge transfer pathways to pass the interparticle p-p junctions, and the p-n junctions in each particle increase the sensitivity of the reactions to gas molecules. The small grain size and high surface area of each domain also enhance the surface gas adsorption.
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