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ACS Appl Mater Interfaces

Title:		ZnO-CuO Core-Hollow Cube Nanostructures for Highly Sensitive Acetone Gas Sensors at the ppb Level
Author(s):		Lee JE; Lim CK; Park HJ; Song H; Choi SY; Lee DS;
Address:		"Graphene/2D Materials Research Center, Center for Advanced Materials Discovery towards 3D Displays, School of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea. Electronics and Telecommunications Research Institute (ETRI), 218 Gajeong-ro, Yuseong-gu, Daejeon 34129, Republic of Korea. Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea"
Journal Title:		ACS Appl Mater Interfaces
Year:		2020
Volume:		20200727
Issue:		31
Page Number:		35688 - 35697
DOI:		10.1021/acsami.0c08593
ISSN/ISBN:		1944-8252 (Electronic) 1944-8244 (Linking)
Abstract:		"This paper presents a ZnO-CuO p-n heterojunction 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"
Keywords:		acetone detection hybrid nanostructure metal oxide semiconductor p-n junction ultrasensitive gas sensor;
Notes:		"PubMed-not-MEDLINELee, Jae Eun Lim, Chan Kyu Park, Hyung Ju Song, Hyunjoon Choi, Sung-Yool Lee, Dae-Sik eng 2020/07/04 ACS Appl Mater Interfaces. 2020 Aug 5; 12(31):35688-35697. doi: 10.1021/acsami.0c08593. Epub 2020 Jul 27"