journal article·2020-04-24

Partially Oxidized Ti3C2Tx MXenes for Fast and Selective Detection of Organic Vapors at Part-per-Million Concentrations

Hanna Pazniak, Ilya A. Plugin, Michael J. Loes, Talgat M. Inerbaev, Igor N. Burmistrov, Michail Gorshenkov, Josef Polcak, Alexey S. Varezhnikov, Martin Sommer, Denis V. Kuznetsov, Michael Bruns, Fedor S. Fedorov, Nataliia S. Vorobeva, Alexander Sinitskii, Victor V. Sysoev

ACS Applied Nano Materials· Volume 3· Issue 4
Publisher page

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.
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Research context

OpenAlex topics: MXene and MAX Phase Materials · 2D Materials and Applications · Advanced Memory and Neural Computing

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Functional Nanosystems and High-Temperature Materials, National University of Science and Technology “MISiS”, Moscow, 119049, Russia

Department of Physics, Yuri Gagarin State Technical University of Saratov, Saratov, 410054, Russia

Department of Chemistry, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, United States

V. S. Sobolev Institute of Geology and Mineralogy SB RAS, Novosibirsk, 630090, Russia

L. N. Gumilyov Eurasian National University, Astana, 010008, Kazakhstan

Engineering Center, Department of Chemistry of Innovative Materials and Technologies, Plekhanov Russian University of Economics, Moscow, 117997, Russia

CEITEC-Central European Institute of Technology, Brno University of Technology, Brno, 61600, Czech Republic

Institute of Physical Engineering, Brno University of Technology, Brno, 61669, Czech Republic

Institute of Microstructure Technology, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, 76344, Germany

Institute for Applied Materials, Karlsruhe Institute of Technology (KIT), Eggenstein-Leopoldshafen, 76344, Germany

Skolkovo Institute of Science and Technology, Moscow, 121205, Russia

Funding

Nebraska Center for Energy Sciences Research, University of Nebraska-Lincoln · Ministry of Education and Science of the Russian Federation

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