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Aiming at stable biosensing operation, aqueous‐grown ZnO nanorods on sapphire substrates were examined their chemical stability against the immersion in HCl solution. Density and diameter of the ZnO nanorods were remained but their height was shortened when immersed with aminosilane modification while bare ZnO nanorods were completely disappeared after 5 min immersion, indicating that the aminosilane modification is useful to improve the chemical stability of ZnO nanolods even though the membrane by the silanezation process is not fully stable to HCl solution. (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Electric properties of aqueous grown ZnO nanorods were investigated. Vertical current measurement through the top 20‐nm‐thick Au electrode/ZnO nanorods/bottom Au film structure showed asymmetric I‐V properties and was discussed in terms of different interface properties between ZnO nanorods and Au. Schottky barrier height in top Au electrode and ZnO nanorods was estimated to be 0.22eV based on core level X‐ray photoelectron spectroscopy (XPS) spectra. XPS experiment also suggests that aqueous grown ZnO nanorods have Zn‐polarity and that might be one of the reasons of lower barrier height. (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

ZnO nanorods were grown on various substrates using aqueous solution, aiming at integrating with bio− or organic− molecular structures assembled by bottom-up process. ZnO nanorods with the average diameter of 100 nm and the height of 1.5μm were obtained on an Au/Ti/Si (111) substrate via microwave heating, which is an environmental harmonized system allowing fast heating. Aggregation of ZnO nanorods occurred on a single crystalline ZnMgO film and growth mechanism of ZnO nanorods was discussed. Using ZnO nanorods immobilized with enzymes, amperometric glucose sensors with the detection limit of 0.01mmol/L were fabricated.

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