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Au decoration of vertical hematite nanotube arrays for further selective detection of acetone in exhaled breath

Authors
Kim, Do HongKim, Tae HoonSohn, WoonbaeSuh, Jun MinShim, Young-SeokKwon, Ki ChangHong, KootakChoi, SeokhoonByun, Hyung-GiLee, Jong-HeunJang, Ho Won
Issue Date
20-11월-2018
Publisher
ELSEVIER SCIENCE SA
Keywords
Hematite nanotubes; Acetone sensor; Au catalyst; Anodization; Diabetes mellitus
Citation
SENSORS AND ACTUATORS B-CHEMICAL, v.274, pp.587 - 594
Indexed
SCIE
SCOPUS
Journal Title
SENSORS AND ACTUATORS B-CHEMICAL
Volume
274
Start Page
587
End Page
594
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/71823
DOI
10.1016/j.snb.2018.07.159
ISSN
0925-4005
Abstract
Vertically ordered hematite nanotubes decorated with Au nanoparticles are synthesized by a facile electrochemical anodization method and self-agglomeration of Au films. Au decoration significantly enhances the response of hematite nanotubes to acetone at 350 degrees C and the response to acetone is 2.4 times higher than the response to ethanol, the counterpart target gas. The Au nanoparticles decorated hematite nanotubes exhibit unprecedentedly high and selective responses to acetone at 350 degrees C with 50% relative humidity condition (calibrated at room temperature, 25 degrees C). The enhanced gas sensing properties in a humid condition were attributed to the spillover effect by Au nanoparticles and high porosity of hematite nanotubes with a large surface-to-volume ratio. These results indicate that Au nanoparticles decorated hematite nanotubes are promising for use in high quality sensor materials for breath analyzers to diagnose diabetes mellitus.
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