Researchers from the Nanomaterials Group have just published a high-impact article on MXene gas sensors produced with our KAIST collaborators:
S. J. Kim, H.-J. Koh, C. E. Ren, O. Kwon, K. Maleski, S.-Y. Cho, B. Anasori, C.-K. Kim, Y.-K. Choi, J. Kim, Y. Gogotsi, H.-T. Jung, Metallic Ti3C2Tx MXene gas sensors with ultrahigh signal-to-noise ratio, ACS Nano, (2018)
It has been selected by ACS as ACS Editors’ Choice article and published Open Access ($3000 fee waived). ACS selects a paper per day (less than 1% of all papers published) from more than 50 ACS journals as “Editors’ Choice”, so it’s an important recognition that adds visibility to our paper.
We demonstrate that a metallic 2D MXene gas-sensing channel with high conductivity greatly outperforms conventional sensing materials in two critical aspects. First, a Ti3C2Tx gas sensor exhibits a limit of detection of 50~100 parts per billion (ppb) for volatile organic compounds, which is one of the lowest limits of their detection at room temperature ever reported. Second, the extremely low noise of metallic Ti3C2Tx leads to the signal-to-noise ratio two orders of magnitude higher than that of the published sensors. This study introduces a paradigm shift from semiconducting to metallic sensing channels for developing highly sensitive sensors.
The first author, Seon Joon (Steven) Kim, is a former visiting student who spent 6 months at Drexel during his PhD study. We expect him to come back to Drexel as a visiting post-doctoral scientist supported by our NNFC-KAIST-Drexel Nano Co-op Center soon.
Congratulations to Steven, Kathleen, Evelyn, Babak and other co-authors!