Metal-Organic Framework-Assisted Construction of TiO2/Co3O4 Highly Ordered Necklace-like Heterostructures for Enhanced Ethanol Vapor Sensing Performance

Date

2018

Authors

Zhang, Tian
Tang, Xing
Zhang, Jian
Zhou, Tingting
Wang, Hao
Wu, Congyi
Xia, Xianping
Xie, Changsheng
Zeng, Dawen

Journal Title

Journal ISSN

Volume Title

Publisher

American Chemical Society

Abstract

In this work, we report a metal–organic framework (MOF)-assisted strategy to synthesize necklace-like TiO2/Co3O4 nanofibers with highly ordered heterostructures via a facile approach including electrospinning and subsequent calcination. Polycrystalline TiO2 nanofibers and Co3O4 nanocages are consummately interconnected to form a highly ordered heterogeneous nanostructure, which can be of benefit for precisely accommodating the interface resistance of the p–n heterojunctions and the future realization of improved material performance. The ethanol-gas-sensing investigation showed that TiO2/Co3O4 nanofiber sensors exhibited a strong ethanol response (Rair/Rgas −1 = 16.7 @ 150 ppm) and a low operating temperature of 150 °C. The sensing enhancement mechanism of the TiO2/Co3O4 nanofibers is related to the formation of heterojunctions at interfaces and the high catalytic activity of MOF-derived Co3O4. Furthermore, this versatile method is a promising approach to constructing ordered heterostructures and extending the MOF-based heterogeneous materials toward wide applications.

Description

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Citation

Source

Langmuir

Type

Journal article

Book Title

Entity type

Access Statement

License Rights

DOI

10.1021/acs.langmuir.8b02620

Restricted until

2099-12-31