@article{e33ab529b5684c84982ece48b2f8e6e4,
title = "Partially Oxidized Ti3C2Tx MXenes for Fast and Selective Detection of Organic Vapors at Part-per-Million Concentrations",
abstract = "MXenes, two-dimensional transition metal carbides or nitrides, have recently shown great promise for gas sensing applications. We demonstrate that the sensitivity of intrinsically metallic Ti3C2Tx MXene can be considerably improved via its partial oxidation in air at 350 °C. The annealed films of MXene sheets remain electrically conductive, while their decoration with semiconducting TiO2 considerably improves their chemiresistive response to organic analytes at low-ppm concentrations in dry air, which was used to emulate practical sensing environments. We demonstrate that partially oxidized MXene has a faster and a qualitatively different sensor response to volatile analytes compared to pristine Ti3C2Tx. We fabricated multisensor arrays of partially oxidized Ti3C2Tx MXene devices and demonstrate that in addition to their high sensitivity they enable a selective recognition of analytes of nearly the same chemical nature, such as low molecular weight alcohols. We investigated the oxidation behavior of Ti3C2Tx in air in a wide temperature range and discuss the mechanism of sensor response of partially oxidized MXene films, which is qualitatively different from that of pristine Ti3C2Tx ",
keywords = "MXene, chemiresistive response, gas sensor, multisensor array, titanium carbide, titanium dioxide, work function",
author = "Hanna Pazniak and Plugin, {Ilya A.} and Loes, {Michael J.} and Inerbaev, {Talgat M.} and Burmistrov, {Igor N.} and Michail Gorshenkov and Josef Polcak and Varezhnikov, {Alexey S.} and Martin Sommer and Kuznetsov, {Denis V.} and Michael Bruns and Fedorov, {Fedor S.} and Vorobeva, {Nataliia S.} and Alexander Sinitskii and Sysoev, {Victor V.}",
note = "Funding Information: The work was carried out with the financial support from the Ministry of Education and Science of the Russian Federation in the framework of the Increase Competitiveness Program of NUST “MISiS” (No. K4-2017-043), implemented by the government decree from 16th of March 2013, N 211. I.A.P., A.S.V., and V.V.S. thank the Ministry of Education and Science of the Russian Federation for their support by Grant No. 16.1119.2017/4.6. The work of T.M.I. was performed under the state assignment of IGM SB RAS. T.M.I. also thanks the Center for Computational Materials Science (IMR, Tohoku University) for access to the supercomputing system to perform the simulations. The calculations were partially performed at the Cherry supercomputer cluster provided by the Materials Modeling and Development Laboratory at NUST “MISIS” (supported via the Grant from the Ministry of Education and Science of the Russian Federation No. 14.Y26.31.0005). A.S. thanks the Nebraska Center for Energy Sciences Research for support. J.P. gratefully acknowledges CzechNanoLab Research Infrastructure supported by MEYS CR (LM2018110) and the project CEITEC 2020 (LQ1601) supported by MEYS CR under the National Sustainability Programme II. Publisher Copyright: Copyright {\textcopyright} 2020 American Chemical Society.",
year = "2020",
month = apr,
day = "24",
doi = "10.1021/acsanm.9b02223",
language = "English (US)",
volume = "3",
pages = "3195--3204",
journal = "ACS Applied Nano Materials",
issn = "2574-0970",
publisher = "American Chemical Society",
number = "4",
}