UV-Light-Tunable p-/n-Type Chemiresistive Gas Sensors Based on Quasi-1D TiS<sub>3</sub> Nanoribbons: Detection of Isopropanol at ppm Concentrations
Victor V. Sysoev,
Andrey V. Lashkov,
Alexey Lipatov,
Ilya A. Plugin,
Michael Bruns,
Dirk Fuchs,
Alexey S. Varezhnikov,
Mustahsin Adib,
Martin Sommer,
Alexander Sinitskii
Affiliations
Victor V. Sysoev
Department of Physics, Yuri Gagarin State Technical University of Saratov, 410054 Saratov, Russia
Andrey V. Lashkov
Center for Probe Microscopy and Nanotechnology, National Research University of Electronic Technology, 124498 Moscow, Russia
Alexey Lipatov
Department of Chemistry, Biology & Health Sciences, South Dakota School of Mines and Technology, 501 E. Saint Joseph St., Rapid City, SD 57701, USA
Ilya A. Plugin
Department of Physics, Yuri Gagarin State Technical University of Saratov, 410054 Saratov, Russia
Michael Bruns
Institute for Applied Materials and Karlsruhe Nano Micro Facility, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
Dirk Fuchs
Institute for Quantum Materials and Technologies, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
Alexey S. Varezhnikov
Department of Physics, Yuri Gagarin State Technical University of Saratov, 410054 Saratov, Russia
Mustahsin Adib
Institute for Microstructure Technology, Karlsruhe Institute of Technology (KIT), 76344 Eggenstein-Leopoldshafen, Germany
Martin Sommer
Institute for Microstructure Technology, Karlsruhe Institute of Technology (KIT), 76344 Eggenstein-Leopoldshafen, Germany
Alexander Sinitskii
Department of Chemistry, University of Nebraska—Lincoln, Lincoln, NE 68588, USA
The growing demand of society for gas sensors for energy-efficient environmental sensing stimulates studies of new electronic materials. Here, we investigated quasi-one-dimensional titanium trisulfide (TiS3) crystals for possible applications in chemiresistors and on-chip multisensor arrays. TiS3 nanoribbons were placed as a mat over a multielectrode chip to form an array of chemiresistive gas sensors. These sensors were exposed to isopropanol as a model analyte, which was mixed with air at low concentrations of 1–100 ppm that are below the Occupational Safety and Health Administration (OSHA) permissible exposure limit. The tests were performed at room temperature (RT), as well as with heating up to 110 °C, and under an ultraviolet (UV) radiation at λ = 345 nm. We found that the RT/UV conditions result in a n-type chemiresistive response to isopropanol, which seems to be governed by its redox reactions with chemisorbed oxygen species. In contrast, the RT conditions without a UV exposure produced a p-type response that is possibly caused by the enhancement of the electron transport scattering due to the analyte adsorption. By analyzing the vector signal from the entire on-chip multisensor array, we could distinguish isopropanol from benzene, both of which produced similar responses on individual sensors. We found that the heating up to 110 °C reduces both the sensitivity and selectivity of the sensor array.
