Quasi-2D Co3O4 nanoflakes as an efficient gas sensor: versus alcohol VOCs

Here, we study quasi-two-dimensional crystals of Co3O4 grown by electrochemical synthesis on Pt electrodes with a nanoflake morphology to serve as a gas sensor. When synthesizing in aqueous electrolytes under applied electrical bias, the material follows a self-hierarchical architecture to primarily appear as the hexagonal nanoflakes α-Co(OH)2. After heating up to 300 °C in air, the as-synthesized material transforms to Co3O4, preserving the original hierarchical morphology. The Co3O4 nanoflakes have been found to have remarkable chemiresistive response when exposed to various kinds of alcohol vapors, at low ppm concentrations in a mixture with air, over a wide range of temperatures up to 300 °C with a detection limit down to the ppb range with direct dependence on the molecule weight of the alcohol. We explain the observed features of the gas response of the Co3O4 nanoflakes by a shift in the electron density under the chemisorption of VOCs, verified by DFT calculations.

DOI

10.1039/d0ta00511h

Citation

Fedorov, F S, Solomatin, M A, Uhlemann, M, Oswald, S, Kolosov, D A, Morozov, A, Varezhnikov, A S, Ivanov, M A, Grebenko, A K, Sommer, M, Glukhova, O E, Nasibulin, A G & Sysoev, V V 2020, ' Quasi-2D Co 3 O 4 nanoflakes as an efficient gas sensor : versus alcohol VOCs ', Journal of Materials Chemistry. A, vol. 8, no. 15, pp. 7214-7228 . https://doi.org/10.1039/d0ta00511h

Permanent link to this item

https://urn.fi/URN:NBN:fi:aalto-202006254073

Collections

[article-cris] Kemian tekniikan korkeakoulu / CHEM

Show all metadata

Quasi-2D Co3O4 nanoflakes as an efficient gas sensor: versus alcohol VOCs

Access rights

URL

Journal Title

Journal ISSN

Volume Title

Authors

Date

Department

Major/Subject

Mcode

Degree programme

Language

Pages

Series

Abstract

Description

Keywords

Other note

DOI

Citation

Permanent link to this item

Collections