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

被引：55

作者：

Zhang, Tian ^{[1
,2
]}

Tang, Xing ^{[1
]}

Zhang, Jian ^{[1
,3
]}

Zhou, Tingting ^{[1
]}

Wang, Hao ^{[1
]}

Wu, Congyi ^{[1
]}

Xia, Xianping ^{[1
]}

Xie, Changsheng ^{[1
]}

Zeng, Dawen ^{[1
,2
]}

机构：

[1] HUST, Sch Mat Sci & Engn, State Key Lab Mat Proc & Die & Mould Technol, Wuhan 430074, Hubei, Peoples R China

[2] Hubei Univ, Hubei Collaborat Innovat Ctr Adv Organ Chem Mat, Wuhan 430062, Hubei, Peoples R China

[3] Australian Natl Univ, Coll Engn & Comp Sci, Res Sch Engn, Canberra, ACT 2601, Australia

来源：

LANGMUIR | 2018年 / 34卷 / 48期

关键词：

GAS SENSOR; HYDROTHERMAL SYNTHESIS; SNO2; NANOTUBES; TIO2; SENSITIZATION; TEMPERATURE; CATALYSTS; HETEROJUNCTIONS; NANOCOMPOSITES; TRANSITION;

D O I：

10.1021/acs.langmuir.8b02620

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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 electro-spinning 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 degrees 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.

引用

页码：14577 / 14585

页数：9