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Sensors 2011, 11(10), 9685-9699; doi:10.3390/s111009685

Design of Highly Sensitive C2H5OH Sensors Using Self-Assembled ZnO Nanostructures

Department of Materials Science and Engineering, Korea University, Seoul 136-713, Korea
Author to whom correspondence should be addressed.
Received: 5 September 2011 / Revised: 26 September 2011 / Accepted: 8 October 2011 / Published: 12 October 2011
(This article belongs to the Special Issue Sensing at the Nano-Scale: Chemical and Bio-Sensing)
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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 (Ra/Rg = ~1,200, Ra: resistance in air, Rg: 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.
Keywords: ZnO; gas sensor; nanostructures, hierarchical structures; self-assembly ZnO; gas sensor; nanostructures, hierarchical structures; self-assembly
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Kim, K.-M.; Kim, H.-R.; Choi, K.-I.; Kim, H.-J.; Lee, J.-H. Design of Highly Sensitive C2H5OH Sensors Using Self-Assembled ZnO Nanostructures. Sensors 2011, 11, 9685-9699.

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