期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 268, 期 -, 页码 223-231出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2018.04.119
关键词
Au@NiO; Core-shell NPs; Baseline resistance; Sensitivity; M@p-MOS
资金
- Ministry of Education and Human Resource Development
- National Research Foundation of Korea (NRF) - Korean government (MSIP) (BRL) [2015042417, 2016R1A2B4014090]
- Business for Academic-industrial Cooperative establishments - Korea Small and Medium Business Administration [C0396231]
- Korea Technology & Information Promotion Agency for SMEs (TIPA) [C0396231] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
In this work, Au@NiO core-shell nanoparticles (C-S NPs) as a p-type gas sensing material was synthesized by a facile wet-chemical method, and evaluated their gas sensing properties as compared to the pristine NiO NPs gas sensors. Transmission electron microscope (TEM) results exhibited the well-dispersed formation of Au@NiO C-S NPs having the total size of 70-120 nm and NiO shells having 30-50 nm thickness. The C-S morphology as well as the overall particle sizes are unchanged even at 500 degrees C. The gas sensing result reveals that the response of Au@NiO C-S NPs gas sensor is higher than pristine NiO NPs gas sensor for 100 ppm of ethanol at 200 degrees C operating temperature. The baseline resistance in the air for Au@NiO C-S NPs sensor is lowered as compared to pristine NiO NPs, which is due to the increased number of holes as charge carriers in Au@NiO C-S NPs. The high response of Au@NiO core-shell NPs as compared to pristine NiO NPs is attributed to electronic and chemical sensitization effects of Au. In Au@NiO C-S structure, the contact between metal (Au) and semiconductor (NiO) formed a Schottky junction since Au metal acted as electron acceptor, a withdrawal of electrons from NiO by Au metal core leaved behind number of holes as charge carriers in Au@NiO C-S NPs. Therefore, the baseline resistance of Au@NiO C-S NPs greatly decreased than pristine NiO NPs, as a result the Au@NiO C-S NPs showed higher response. On the other hand, in chemical sensitization effect, Au NPs catalyzed to dissociate O-2 molecules into ionic species. This work will give some clue to the researchers for the further development of p-type based C-S NPs sensors. (c) 2018 Elsevier B.V. All rights reserved.
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