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A near single crystalline TiO2 nanohelix array: enhanced gas sensing performance and its application as a monolithically integrated electronic nose

Title
A near single crystalline TiO2 nanohelix array: enhanced gas sensing performance and its application as a monolithically integrated electronic nose
Authors
Sunyong HwangKWON, HYUNAHSameer ChhajedJi Won ByunJeong Min BaikJiseong ImOh, SHHo Won JangSeok Jin YoonKim, JK
POSTECH Authors
Oh, SHKim, JK
Date Issued
2013-01
Publisher
Royal Society of Chemistry
Abstract
We present high performance gas sensors based on an array of near single crystalline TiO2 nanohelices fabricated by rotating oblique angle deposition (OAD). The combination of large surface-to-volume ratio, extremely small size (<30 nm) comparable to the Debye length, a near single crystallinity of TiO2 nanohelices, together with the unique top-and-bottom electrode configuration hugely improves the H-2-sensing performance, including similar to 10 times higher response at 50 ppm, approximately a factor of 5 lower detection limit, and much faster response time than the conventional TiO2 thin film devices. Beyond such remarkable performance enhancement, the excellent compatibility of the OAD method compared with the conventional micro-fabrication technology opens a new avenue for monolithic integration of high-performance chemoresistive sensors to fabricate a simple, low cost, reliable, yet fully functional electronic nose and multi-functional smart chips for in situ environmental monitoring.
We present high performance gas sensors based on an array of near single crystalline TiO2 nanohelices fabricated by rotating oblique angle deposition (OAD). The combination of large surface-to-volume ratio, extremely small size (<30 nm) comparable to the Debye length, a near single crystallinity of TiO2 nanohelices, together with the unique top-and-bottom electrode configuration hugely improves the H-2-sensing performance, including similar to 10 times higher response at 50 ppm, approximately a factor of 5 lower detection limit, and much faster response time than the conventional TiO2 thin film devices. Beyond such remarkable performance enhancement, the excellent compatibility of the OAD method compared with the conventional micro-fabrication technology opens a new avenue for monolithic integration of high-performance chemoresistive sensors to fabricate a simple, low cost, reliable, yet fully functional electronic nose and multi-functional smart chips for in situ environmental monitoring.
URI
https://oasis.postech.ac.kr/handle/2014.oak/15795
DOI
10.1039/C2AN35932D
ISSN
0003-2654
Article Type
Article
Citation
Analyst, vol. 138, no. 2, page. 443 - 450, 2013-01
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김종규KIM, JONG KYU
Dept of Materials Science & Enginrg
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