The synthesis and selective gas sensing characteristics of SnO2/α-Fe2O3 hierarchical nanostructures

被引:85
作者
Chen, Yujin [1 ,2 ]
Zhu, Chunling [3 ]
Shi, Xiaoling [2 ]
Cao, Maosheng [2 ]
Jin, Haibo [2 ]
机构
[1] Harbin Engn Univ, Coll Sci, Harbin 15001, Peoples R China
[2] Beijing Inst Technol, Sch Mat Sci & Engn, Beijing 100081, Peoples R China
[3] Harbin Engn Univ, Coll Mat Sci & Chem Engn, Harbin 15001, Peoples R China
关键词
D O I
10.1088/0957-4484/19/20/205603
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
SnO2/alpha-Fe2O3 hierarchical nanostructures, in which the SnO2 nanorods grow on the side surface of alpha-Fe2O3 nanorods as multiple rows, were synthesized via a three-step process. The diameters and lengths of the SnO2 nanorods are 6-15 nm and about 120 nm. The growth direction of SnO2 nanorods is [001], significantly affected by that of alpha-Fe2O3 nanorods. The hetero-nanostructures exhibit very good selectivity to ethanol. The sensing characteristics are related to the special heterojunction structures, confirmed by high-resolution transmission electron microscopy observation. Therefore, a heterojunction barrier controlled gas sensing mechanism is realized. Our results demonstrate that the hetero-nanostructures are promising materials for fabricating sensors and other complex devices.
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页数:5
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