Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 6, Issue 17, Pages 14779-14784Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am504156w
Keywords
hematite; nanotube array; acetone sensor; earth abundant; ultrasensitive
Funding
- Center for Integrated Smart Sensors funded by the Ministry of Science, ICT & Future Planning as the Global Frontier Project
- Outstanding Young Researcher Program through the National Research Foundation of Korea
- Aspiring Researcher Program through Seoul National University
- Korea Institute of Science and Technology
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Vertically ordered nanotube array is a desirable configuration to improve gas sensing properties of the hematite which is the most abundant and cheapest metal oxide semiconductor on earth but has low and sluggish chemiresistive responses. We have synthesized a vertically aligned, highly ordered hematite nanotube array directly on a patterned SiO2/Si substrate and then it used as a gas sensor without additional processing. The nanotube array sensor shows unprecedentedly ultrahigh and selective responses to acetone with detection limits down to a few parts per billion and response time shorter than 3 s.
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