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Nano-structuring of Metal Oxides for Molecular Sensors
Keywords: Metal Oxide, Nanomaterial, Aqueous Solution Process
Nano-structuring of metal oxides was realized in aqueous solutions. Characteristic nanostructures were developed by control of nucleation and crystal growth. They were applied to molecular sensors. Tin oxide nanosheets were crystallized on transparent conductive oxide substrates of fluorine-doped tin oxide in aqueous solutions. The nanosheets had chemical ratio of Sn : O : F = 1 : 1.85 : 0.076, suggesting fluorine doping into SnO2. They were hydrophobic surfaces with contact angle of 140°. They were converted to hydrophilic surfaces with contact angle of below 1° by light irradiation. The tin oxide nanosheets were modified with dye-labeled monoclonal antibody. Monoclonal antibody reacts with human alpha-fetoprotein in blood serum of hepatocellular cancer patient. Photoluminescence and photocurrent were obtained from the nanosheets under excitation light. The tin oxide nanosheets with dye-labeled prostate specific antigen will be used for electrodes of prostate cancer sensors. Flower-like multineedle TiO2 nanostructures were fabricated in aqueous solutions. The surface of silicon substrates with fine artificial uneven structures were uniformly coated with the nanostructures by one-step immersion. ZnO rod arrays were fabricated on fluorine-doped tin oxide substrates without seed layers. The rods elongated along the c-axis and stood perpendicular to the substrates. They showed only a 0002 X-ray diffraction peak, indicating a high c-axis orientation.
Yoshitake Masuda, Senior Research Scientist
National Institute of Advanced Industrial Science and Technology (AIST)
Nagoya, Aichi

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