title: Design of highly sensitive C2H5OH sensors using self-assembled ZnO nanostructures.
abstract: 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 C(2)H(5)OH. In particular, ultra-high responses (R(a)/R(g) = ∼1,200, R(a): resistance in air, R(g): resistance in gas) to 100 ppm C(2)H(5)OH 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.
authors.affiliation: Department of Materials Science and Engineering, Korea University, Seoul 136-713, Korea. mackjan@korea.ac.kr
authors.forename: Kang-Min
authors.initials: KM
authors.lastname: Kim
authors.forename: Hae-Ryong
authors.initials: HR
authors.lastname: Kim
authors.forename: Kwon-Il
authors.initials: KI
authors.lastname: Choi
authors.forename: Hyo-Joong
authors.initials: HJ
authors.lastname: Kim
authors.forename: Jong-Heun
authors.initials: JH
authors.lastname: Lee
mesh_terms: D000327:Adsorption; D015374:Biosensing Techniques / Q000295:instrumentation*; D002152:Calorimetry, Differential Scanning; D004867:Equipment Design; D000431:Ethanol / Q000032:analysis*; D005740:Gases / Q000032:analysis; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D043942:Nanotubes / Q000737:chemistry / Q000648:ultrastructure; D016062:Porosity; D013696:Temperature; D013818:Thermogravimetry; D014961:X-Ray Diffraction; D015034:Zinc Oxide / Q000737:chemistry*
chemical_list: D005740:Gases; D000431:Ethanol; D015034:Zinc Oxide