Gas sensor based а composite of MoS2 and functionalized multi-walled carbon nanotubes

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Abstract

A gas sensor based on MoS2 and functionalized multi-walled carbon nanotubes (MWCNTs) was obtained by drop casting. A coating was created in which the sensitive material consisted of functionalized MWCNTs (treated in a mixture of H2SO4/HNO3, 3 : 1 vol %), coated with MoS2 nanoplatelets. Sensor tests were carried out in dynamic mode with respect to two different types of gases (NO2 and NH3). The sensor demonstrated high relative sensitivity (|ΔR/R0|=36%) for 10 ppm NO2 at room temperature (25 ± 1°C). When determining ammonia, the response of the gas sensor (at 25 ± 1°C) was significantly lower compared to nitrogen dioxide detection and varied in the range of 5–12.5% at 50–400 ppm. It was shown that functionalized MWCNTs acted as a conductive additive, which allowed for a high response of the sensor based on the MoS2/f-MWCNT composite already at room temperature.

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About the authors

A. A. Shishin

Novosibirsk State Technical University

Author for correspondence.
Email: tmyora0@gmail.com
Russian Federation, 630073 Novosibirsk

V. Golovakhin

Novosibirsk State Technical University

Email: golovaxin-valera@mail.ru
Russian Federation, 630073 Novosibirsk

E. A. Maksimovsky

Nikolaev Institute of Inorganic Chemistry SB RAS

Email: eugene@niic.nsc.ru
Russian Federation, 630090 Novosibirsk

A. V. Ishchenko

Boreskov Institute of Catalysis SB RAS

Email: arcady.ishchenko@gmail.com
Russian Federation, 630090 Novosibirsk

M. V. Popov

Novosibirsk State Technical University; Mendeleev University of Chemical Technology of Russia

Email: popovmaxvik@gmail.com
Russian Federation, 630073 Novosibirsk; 125047 Moscow

D. O. Kondrashev

Ufa State Petroleum Technological University

Email: Kondrashev.DO@gazprom-neft.ru
Russian Federation, 450064 Ufa

A. G. Bannov

Novosibirsk State Technical University

Email: bannov_a@mail.ru
Russian Federation, 630073 Novosibirsk

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2. Fig. 1. Methodology for creating a gas sensor based on MoS2/f-MWCNTs. Functionalized MWCNTs are marked with an asterisk.

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3. Fig. 2. Micrographs of a film of a MoS2/f-MWCNTs sample: SEM – sample on a PCB substrate (a)–(g); TEM (d)–(l).

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4. Fig. 3. Relative sensitivity of the gas sensor with respect to NO2 (25 ± 1 °C, φ = 2.0 ± 0.25%) based on: MoS2/f-MWCNTs (a); f-MWCNTs (b).

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5. Fig. 4. Relative sensitivity of the gas sensor with respect to NH3 (25 ± 1 °C, φ = 2.0 ± 0.25%) based on: MoS2/f-MWCNTs (a); f-MWCNTs (b).

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