Metallic Ti3C2Tx MXene Gas Sensors with Ultrahigh Signal-to-Noise Ratio

Title
Metallic Ti3C2Tx MXene Gas Sensors with Ultrahigh Signal-to-Noise Ratio
Authors
김선준고형준Chang E. Ren권오민Kathleen Maleski조수연Babak Anasori김충기최양규김지한Yury Gogotsi정희태
Keywords
two-dimensional materials; MXene; titanium carbide; gas sensing; metallic channel; signal-to-noise ratio; volatile organic compound
Issue Date
2018-01
Publisher
ACS Nano
Citation
VOL 12, NO 2-993
Abstract
Achieving high sensitivity in solid-state gas sensors can allow the precise detection of chemical agents. In particular, detection of volatile organic compounds (VOCs) at the parts per billion (ppb) level is critical for the early diagnosis of diseases. To obtain high sensitivity, two requirements need to be simultaneously satisfied: (i) low electrical noise and (ii) strong signal, which existing sensor materials cannot meet. Here, we demonstrate that 2D metal carbide MXenes, which possess high metallic conductivity for low noise and a fully functionalized surface for a strong signal, greatly outperform the sensitivity of conventional semiconductor channel materials. Ti3C2Tx MXene gas sensors exhibited a very low limit of detection of 50– 100 ppb for VOC gases at room temperature. Also, the extremely low noise led to a signal-to-noise ratio 2 orders of magnitude higher than that of other 2D materials, surpassing the best sensors known. Our results provide insight in utilizing highly functionalized metallic sensing channels for developing highly sensitive sensors.
URI
http://pubs.kist.re.kr/handle/201004/69974
ISSN
1936-0851
Appears in Collections:
KIST Publication > Article
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE