期刊
NANOTECHNOLOGY
卷 22, 期 18, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0957-4484/22/18/185501
关键词
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资金
- National Natural Science Foundation of China [20771061, 20871071]
- Science and Technology Commission Foundation of Tianjin [09JCYBJC03600, 10JCYBJC03900]
alpha-Fe2O3@ZnO core-shell nanospindles were synthesized via a two-step hydrothermal approach, and characterized by means of SEM/TEM/XRD/XPS. The ZnO shell coated on the nanospindles has a thickness of 10-15 nm. Considering that both alpha-Fe2O3 and ZnO are good sensing materials, we have investigated the gas sensing performances of the core-shell nanocomposite using ethanol as the main probe gas. It is interesting to find that the gas sensor properties of the core-shell nanospindles are significantly enhanced compared with pristine alpha-Fe2O3. The enhanced sensor properties are attributed to the unique core-shell nanostructure. The detailed sensing mechanism is discussed with respect to the energy band structure and the electron depletion theory. The core-shell nanostructure reported in this work provides a new path to fabricate highly sensitive materials for gas sensing applications.
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