| Title: | Metallic Ti(3)C(2)T(x) MXene Gas Sensors with Ultrahigh Signal-to-Noise Ratio |
| Author(s): | Kim SJ; Koh HJ; Ren CE; Kwon O; Maleski K; Cho SY; Anasori B; Kim CK; Choi YK; Kim J; Gogotsi Y; Jung HT; |
| Address: | "A.J. Drexel Nanomaterials Institute, Drexel University , Philadelphia, Pennsylvania 19104, United States" |
| ISSN/ISBN: | 1936-086X (Electronic) 1936-0851 (Linking) |
| 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. Ti(3)C(2)T(x) 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" |
| Keywords: | MXene gas sensing metallic channel signal-to-noise ratio titanium carbide two-dimensional materials volatile organic compound; |
| Notes: | "PubMed-not-MEDLINEKim, Seon Joon Koh, Hyeong-Jun Ren, Chang E Kwon, Ohmin Maleski, Kathleen Cho, Soo-Yeon Anasori, Babak Kim, Choong-Ki Choi, Yang-Kyu Kim, Jihan Gogotsi, Yury Jung, Hee-Tae eng Research Support, Non-U.S. Gov't 2018/01/26 ACS Nano. 2018 Feb 27; 12(2):986-993. doi: 10.1021/acsnano.7b07460. Epub 2018 Jan 25" |
