In Situ Deposited Heterogeneous α-Fe2O3/ZnO Nanorod Arrays for Highly Selective Detection of Ethanol

doi:10.19894/j.issn.1000-0518.200316

Chinese Journal of Applied Chemistry ›› 2021, Vol. 38 ›› Issue (7): 857-865.DOI: 10.19894/j.issn.1000-0518.200316

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In Situ Deposited Heterogeneous α-Fe₂O₃/ZnO Nanorod Arrays for Highly Selective Detection of Ethanol

SUI Li-Li^1*, HUANG Wei-Wei¹, WANG Ping¹, XU Ying-Ming^2*, CHENG Xiao-Li², HUO Li-Hua², JIANG Hui-Ye¹, ZHAO Bing¹, ZHANG Wen-Zhi¹, WANG Zheng-Jun¹, LIU Ya-Hong¹

¹School of Chemistry and Chemical Engineering, Qiqihar University, Qiqihar 161006, China
²Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, China

Received:2020-10-23 Accepted:2021-01-06 Published:2021-07-01 Online:2021-09-01
About author:National Natural Science Foundation of China (Nos.51802167, 21771060, 21776144, 21978140), the International Science & Technology Cooperation Program of China (No.2016YFE0115100), the Natural Science Foundation of Heilongjiang Province (No.LH2019E127) and the Fundamental Research Funds in Heilongjiang Provincial Universities (No.135409208).

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Abstract

Abstract: ZnO nanorod arrays were grown in situ on ceramic tubes by a two-step solution method. Then α-Fe₂O₃ nanoparticles were loaded on the surface of ZnO nanorods via a hydrothermal method to obtain heterogeneous α-Fe₂O₃/ZnO composites. The α-Fe₂O₃/ZnO nanorods are about 30~80 nm in diameter and 1 μm in length, which are cross-arranged to form nanorod arrays. α-Fe₂O₃ nanoparticles with a diameter of about 10 nm distributed on the surface of ZnO nanorods evenly. The gas-sensing properties of the sensors based on pristine ZnO and α-Fe₂O₃/ZnO nanorod arrays were compared, and the gas-sensing mechanism was revealed. The results show that the decoration of α-Fe₂O₃ nanoparticles significantly enhances the sensitivity and selectivity of ZnO nanorod arrays sensors to ethanol at the working temperature of 370 ℃. The response of α-Fe₂O₃/ZnO sensor to 100 μL/L of ethanol is 85.4, which is 9.1 times higher than that of pure ZnO sensor (9.4) determined under the same conditions. The response time is 7 s, and the detection limit is 0.01 μL/L. The work can be applied to the rapid, high sensitivity and selectivity detection for trace ethanol.

Key words: In situ growth, α-Fe₂O₃, ZnO, Nanorod arrays, Heterostructure

CLC Number:

O614.8

SUI Li-Li, HUANG Wei-Wei, WANG Ping, XU Ying-Ming, CHENG Xiao-Li, HUO Li-Hua, JIANG Hui-Ye, ZHAO Bing, ZHANG Wen-Zhi, WANG Zheng-Jun, LIU Ya-Hong. In Situ Deposited Heterogeneous α-Fe₂O₃/ZnO Nanorod Arrays for Highly Selective Detection of Ethanol[J]. Chinese Journal of Applied Chemistry, 2021, 38(7): 857-865.

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In Situ Deposited Heterogeneous α-Fe₂O₃/ZnO Nanorod Arrays for Highly Selective Detection of Ethanol

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