High-energy {001} crystal facets and surface fluorination engineered gas sensing properties of anatase titania nanocrystals

被引：38

作者：

Yang, Yong ^{[1
]}

Hong, Aijun ^{[1
]}

Liang, Yan ^{[2
]}

Xu, Keng ^{[1
]}

Yu, Ting ^{[1
]}

Shi, Jing ^{[1
]}

Zeng, Fanyan ^{[1
]}

Qu, Yaohui ^{[1
]}

Liu, Yanting ^{[1
]}

Ding, Mengqi ^{[1
]}

Zhang, Wen ^{[1
]}

Yuan, Cailei ^{[1
]}

机构：

[1] Jiangxi Normal Univ, Sch Phys Commun & Elect, Jiangxi Key Lab Nanomat & Sensors, Jiangxi Key Lab Photoelect & Telecommun, Nanchang 330022, Jiangxi, Peoples R China

[2] Jiangxi Univ Technol, Dept Sci Educ, Nanchang 330098, Jiangxi, Peoples R China

来源：

APPLIED SURFACE SCIENCE | 2017年 / 423卷

关键词：

TiO2; {001} crystal facets; Surface fluorination; Gas sensing; TIO2; NANOSHEETS; SENSOR; MICROSPHERES; HYDROGEN; SPHERES;

D O I：

10.1016/j.apsusc.2017.06.208

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Controllable crystal facets exposing is an efficient approach for enhancing gas sensing performances of semiconductor nanomaterials. In order to study the crystal-facets-dependent gas-sensing properties of TiO2 systematically and exactly, a series of anatase TiO2 nanocrystals with different percentage of high-energy {001} crystal facets exposure (from 6% to 91%) were designed and synthesized by a simple hydrofluoric acid-assisted hydrothermal method. Gas sensing tests suggested that gas response of the TiO2 nanocrystals increased with the percentage of high-energy {001} crystal facets, although the specific surface areas gradually decreased. The results unquestionably confirmed the enhanced gas sensing activity of anatase TiO2 high-energy {001} crystal facets. Moreover, it was found that surface fluorination of high-energy {001} crystal facets played a negative role on the gas sensing activity. The relevant sensing mechanism was discussed in detail based on combination of experimental characterization and first-principle calculations, which showed that gas adsorption properties made a great contribution to gas sensing performance. By providing a comprehensive understanding of the crystal-facets-dependent gas-sensing properties of TiO2, the present work will be helpful for the designing of TiO2-based gas-sensing materials. (C) 2017 Elsevier B.V. All rights reserved.

引用

页码：602 / 610

页数：9

共 24 条

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