title: The synthesis and selective gas sensing characteristics of SnO(2)/α-Fe(2)O(3) hierarchical nanostructures.
abstract: SnO(2)/α-Fe(2)O(3) hierarchical nanostructures, in which the SnO(2) nanorods grow on the side surface of α-Fe(2)O(3) nanorods as multiple rows, were synthesized via a three-step process. The diameters and lengths of the SnO(2) nanorods are 6-15 nm and about 120 nm. The growth direction of SnO(2) nanorods is [001], significantly affected by that of α-Fe(2)O(3) 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.
authors.affiliation: College of Science, Harbin Engineering University, Harbin 15001, People's Republic of China. School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, People's Republic of China.
authors.forename: Yujin
authors.initials: Y
authors.lastname: Chen
authors.forename: Chunling
authors.initials: C
authors.lastname: Zhu
authors.forename: Xiaoling
authors.initials: X
authors.lastname: Shi
authors.forename: Maosheng
authors.initials: M
authors.lastname: Cao
authors.forename: Haibo
authors.initials: H
authors.lastname: Jin