Enhanced Gas Sensing Performance of rGO Wrapped Crystal Facet-Controlled Co3O4Nanocomposite Heterostructures

Document Type

Article

Publication Date

3-17-2022

Abstract

Crystal facet engineering and graphene modification are both effective means to improve the gas sensing performance of metal oxide semiconductors (MOSs) currently. However, research on the crystal facet effect and synergistic effect of graphene modification of p-type MOS sensors is relatively lacking. Here, p-type Co3O4nanocrystals with controlled crystal facets ({112} and {100}) were in situ wrapped in the two-dimensional (2D) nanosheet network of graphene. It was found that bare {112} facets showed a significantly higher triethylamine sensing performance than {100} facets, implying a strong crystal facet effect. Interestingly, the triethylamine sensing performance of {112} facets was significantly improved after rGO modification, while the performance improvement of Co3O4{100} was limited after rGO modification. Further study suggested that {112} facets contained more active Co3+species and chemically adsorbed oxygen species than {100} facets, which promoted the adsorption of triethylamine and the subsequent sensing reaction. In addition, the strong electronic interaction between Co3O4{112} crystal facets and rGO promoted efficient charge exchange through the heterogeneous interface. This work provides a new way to improve the gas sensing performance of Co3O4through the synergistic effect of crystal facet engineering and graphene modification.

Identifier

85126113947 (Scopus)

Publication Title

Journal of Physical Chemistry C

External Full Text Location

https://doi.org/10.1021/acs.jpcc.2c00598

e-ISSN

19327455

ISSN

19327447

First Page

4879

Last Page

4888

Issue

10

Volume

126

Grant

2020HSC-CIP013

Fund Ref

National Natural Science Foundation of China

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