Hydrogen sensing in titanate nanotubes associated with modulation in protonic conduction

被引：10

作者：

Alves, D. C. B. ^{[1
]}

Goncalves, A. M. B. ^{[1
]}

Campos, L. C. ^{[1
]}

Avila, E. S. ^{[1
]}

Lacerda, R. G. ^{[1
]}

Ferlauto, A. S. ^{[1
]}

机构：

[1] Univ Fed Minas Gerais, Dept Fis, BR-31270901 Belo Horizonte, MG, Brazil

来源：

NANOTECHNOLOGY | 2011年 / 22卷 / 23期

关键词：

STABILITY; OXIDES; WATER;

D O I：

10.1088/0957-4484/22/23/235501

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Hydrogen/sodium titanate nanotubes (TNTs) were investigated as hydrogen (H-2) sensors. TNT films exhibit good sensing properties and a large response, in particular at room temperature. Electrical conductivity measurements performed under different atmospheres from 25 to 300 degrees C indicate that, for T > 100 degrees C, conduction is thermally activated and can be attributed to electronic transport, whereas for T < 100 degrees C conduction is dominated by protonic transport. The T dependence of the H-2 sensitivity was determined and related to this variation in the dominant transport mechanism. For low T, H-2 sensing originates from the modulation in protonic conduction. Such modulation was attributed to the creation/destruction of surface hydroxyl groups.

引用

页数：4

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