Metallic Ti3C2Tx MXene Gas Sensors with Ultrahigh Signal-to-Noise Ratio
- Metallic Ti3C2Tx MXene Gas Sensors with Ultrahigh Signal-to-Noise Ratio
- 김선준; 고형준; Chang E. Ren; 권오민; Kathleen Maleski; 조수연; Babak Anasori; 김충기; 최양규; 김지한; Yury Gogotsi; 정희태
- two-dimensional materials; MXene; titanium carbide; gas sensing; metallic channel; signal-to-noise ratio; volatile organic compound
- Issue Date
- ACS Nano
- VOL 12, NO 2-993
- 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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