P1.7.13 Highly Sensitive C2H5OH Sensors Using Self-Assembled ZnO Hierarchical Nanostructures

Kang-Min Kim, Hyo-Joong Kim, Hae-Ryong Kim, Kwon-Il Choi & Jong-Heun Lee
Three different morphologies of ZnO nanostructures such as as porous nanorods and two hierarchical structures were prepared by the reaction of mixtures of oleic-acid-dissolved ethanol solutions and aqueous dissolved Znprecursor solutions in the presence of NaOH and their gas sensing characteristics were investigated. Ultra-high responses (Ra/Rg = ~1200, Ra: resistance in air, Rg: resistance in gas) to 100 ppm C2H5OH was achieved using porous nanorods and hierarchical structures assembled from porous nanosheets. Gas sensing characteristics...