NDLI: Synthesis of TiO2 decorated Co3O4 acicular nanowire arrays and their application as an ethanol sensor

Content Provider	Royal Society of Chemistry (RSC)
Author	Liu, Rui Yang, Xiaopeng Zhu, Liping Gao, Zhenfei Liu, Chao Wen, Zhen Yang, Fan Zhang, Liqiang Tu, Zhiqiang Zhang, Yunhan Li, Yongfeng Cui, Lishan
Copyright Year	2015
Abstract	A novel heterostructure of TiO2 modified Co3O4 (TiO2/Co3O4) acicular nanowire (NW) arrays has been fabricated in this study, which demonstrates a good performance for ethanol detection at working temperatures as low as 160 °C. Co3O4 NW arrays were first grown on an Al2O3 substrate patterned with an Ag/Pd electrode by a hydrothermal method, and then TiO2 nanoparticles were decorated on the surface of Co3O4 NW arrays by using pulsed laser deposition (PLD). It is found that after decoration of TiO2, the TiO2/Co3O4 NW array sensor exhibits a much higher response to ethanol (Rg/Ra = 65, Rg is the sensor resistance measured in a mixture of target gases and Ra is the resistance measured in air) compared with the pristine Co3O4 NW sensor (Rg/Ra = 25). Importantly, the TiO2/Co3O4 sensor has shown a detection limit as low as 10 ppm, and a good reproducibility. The reason for the enhanced sensing properties of TiO2/Co3O4 is considered to be due to the formation of a p–n junction between the p-type Co3O4 and n-type TiO2.
Starting Page	2794
Ending Page	2801
Page Count	8
File Format	HTM / HTML PDF
ISSN	20507488
Volume Number	3
Issue Number	6
Journal	Journal of Materials Chemistry A
DOI	10.1039/c4ta06440b
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Heterojunction Nanowire Ethanol Electrode Pulsed laser deposition Radium P\u2013n junction Extrinsic semiconductor
Content Type	Text
Resource Type	Article
Subject	Chemistry Renewable Energy, Sustainability and the Environment Materials Science

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