"Hetero-epitaxy growth of cobalt oxide/nickel oxide nanowire arrays on " by Jiyun Gao, Chenhui Liu et al.
 

Hetero-epitaxy growth of cobalt oxide/nickel oxide nanowire arrays on alumina substrates for enhanced ethanol sensing characteristics

Document Type

Article

Publication Date

2-1-2022

Abstract

In this work, Co3O4 nanowire arrays are prepared in-situ on the flat alumina substrates via a simple hetero-epitaxial growth without adding seed layers. It is found that the density of Co3O4 nanowires can be regulated by varying the concentration of NH4F that acts as substrate activation promoting the formation of nuclei on alumina substrate. In order to improve the gas-sensing performance, porous NiO nanosheets are anchored on the surface of Co3O4 nanowire arrays to form a novel heterostructure (Co3O4/NiO). Gas-sensing tests indicate a higher response value of these array composites towards ethanol (Rg/Ra = 4.26) than that of pristine Co3O4 nanowire arrays (Rg/Ra = 1.27) and NiO nanosheets (Rg/Ra = 1.89). The improved gas-sensing performances resulting from the special array structures and novel heterojunctions can provide abundant diffusion channels for gas molecules as well as a synergistic effect between Co3O4 and NiO.

Identifier

85118843257 (Scopus)

Publication Title

Ceramics International

External Full Text Location

https://doi.org/10.1016/j.ceramint.2021.10.169

ISSN

02728842

First Page

3849

Last Page

3859

Issue

3

Volume

48

Grant

202002AB080001

Fund Ref

National Natural Science Foundation of China

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