期刊
SENSORS
卷 11, 期 10, 页码 9685-9699出版社
MDPI
DOI: 10.3390/s111009685
关键词
ZnO; gas sensor; nanostructures, hierarchical structures; self-assembly
资金
- KOSEF NRL
- Korean government (MEST) [R0A-2008-000-20032-0]
- Fundamental R&D program for Core Technology of Materials [M2008010013]
- Ministry of Knowledge Economy
Various ZnO nanostructures such as porous nanorods and two hierarchical structures consisting of porous nanosheets or crystalline nanorods were prepared by the reaction of mixtures of oleic-acid-dissolved ethanol solutions and aqueous dissolved Zn-precursor solutions in the presence of NaOH. All three ZnO nanostructures showed sensitive and selective detection of C2H5OH. In particular, ultra-high responses (R-a/R-g = similar to 1,200, R-a: resistance in air, R-g: resistance in gas) to 100 ppm C2H5OH was attained using porous nanorods and hierarchical structures assembled from porous nanosheets, which is one of the highest values reported in the literature. The gas response and linearity of gas sensors were discussed in relation to the size, surface area, and porosity of the nanostructures.
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