期刊
ACS NANO
卷 12, 期 2, 页码 986-993出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.7b07460
关键词
two-dimensional materials; MXene; titanium carbide; gas sensing; metallic channel; signal-to-noise ratio; volatile organic compound
类别
资金
- Office of Science of the U.S. Department of Energy [DE-AC02-05CH11231]
- Ministry of Science, ICT, and Future Planning (MSIP) [2015R1A2A1A05001844]
- Leading Foreign Research Institute Recruitment Program - Korean National Research Foundation (NRF) via the NNFC-KAIST-Drexel FIRST Nano2 Co-op Center [2016K1A4A3945038, 2015K1A4A3047100]
- National Research Foundation of Korea [2015K1A4A3047100] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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.
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