Highly Ordered TiO2 Nanotubes on Patterned Substrates: Synthesis-in-Place for Ultrasensitive Chemiresistors

Title
Highly Ordered TiO2 Nanotubes on Patterned Substrates: Synthesis-in-Place for Ultrasensitive Chemiresistors
Authors
김도홍심영석문희규장혜정Dong Su김수영김진상주병권윤석진장호원
Keywords
Nanotubes; Sensors; Chemoresistors
Issue Date
2013-08
Publisher
The Journal of Physical Chemistry C
Citation
VOL 117, NO 34, 17824-17831
Abstract
Integrating a highly ordered TiO2 nanotube array with patterned substrates is an effective design strategy for taking advantage of one-dimensional nanotube structures such as high surface-to-volume ratio and novel functionalities of TiO2, but many challenges remain in synthesis. Here we report a novel synthesis-in-place method for highly ordered vertical TiO2 nanotube films on various patterned substrates and the application of the films to chemiresistive sensors. A unique synthetic strategy, in which the Pt bottom electrodes were clamped during anodization, leads to the complete anodization of the Ti layer to TiO2 nanotubes not only on SiO2/Si substrates but also on glass and sapphire substrates, which can be used as chemiresistors without additional processes. TiO2 nanotube sensors on SiO2/Si substrates show unprecedentedly ultrahigh responses to ethanol and acetone with detection limits down to parts per billion levels. Beyond the high sensitivity, selective responses to ethanol and acetone create opportunities for application in breath analyzers to diagnose human respiratory diseases.
URI
http://pubs.kist.re.kr/handle/201004/45929
ISSN
19327447
Appears in Collections:
KIST Publication > Article
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