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Ohki Labo. Research Activities

Ohki Labo. Research Activities. Reserch Group of Ohki laboratory . 1. Polymer Gr. (Polymer material) Environment problems, Global heating, Biodegradability , Environment-friendly material, Nanocomposite, etc… 2. Electronic Device Gr. (MOS Tr. Novel material for

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Ohki Labo. Research Activities

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  1. Ohki Labo. Research Activities

  2. Reserch Group of Ohki laboratory 1. Polymer Gr.(Polymer material) Environment problems, Global heating, Biodegradability, Environment-friendly material,Nanocomposite, etc… 2. Electronic Device Gr. (MOS Tr. Novel material for a gate insulating film) High-k material for next-generation electronic device, Synchrotron orbit radiation,etc… 3. Applied Optics Gr. Biosensor, Photocatalyst, Metamaterial, Optical fiver, Photonic crystal, etc…

  3. Polymer Gr. Development of environment-friendly materials Biodegradable Polymers Electric conduction properties Dielectric properties Breakdown characteristics Space charge distribution THz spectroscopy Ion migration Temperature dependence Nanocomposites Printed circuit boards

  4. Monitoring and diagnostic testing of cable degradation 2006-2010 Nondisruptive diagnostic method of cable degradation.We look into possible application of broad spectrum impedance spectroscope (BIS). In the future,this data will be of assistance of the standard about evaluating power cable of atomic power plant. The Knowledge Cluster Initiative2007-2011 Offering technical advantagesof high density implementable electronic circuit substrate by polymer nanocomposite technique.

  5. Biodegradable Polymers Digestion synthesis chemical synthesis etc saccharide starch cellulose Biodegradable Plastics photosynthesis destruction microbe microbe digestion decomposition enzyme Polymer with low environmental loads • Made from plant • Cycloid type recycling system • Natural reduction system Compost processing resolved by bacteria H2O CO2 The natural world cycle

  6. Effect of nano-filler addition • in permittivity (nanostructuration) • in some NC : decrease • in some NC : no change • in some NC : increase Polymer nanocomposite and its problem Polymer nanocomposite (NC) is a mixture of polymer and nano-sized filler. From where does the property difference come? filler polymer Property changes associated with nanostructuration is influenced by the interfacebetween the polymer and the nano-filler.

  7. Electronic Device Gr. The thickness of a gate insulating film has been reduced to approximately 1 nm. The increase of leak current by tunneling effect has been caused.

  8. Crystal defects of LaAlO3 Problems of high-k gate insulating material Insulating materials have defects therein. The defects form a localized level in a forbidden band. Fig. LaAlO3 single crystal (Perovskite structure) The localized level causes leak current. Method for detecting crystal defects 1. Photoluminescence (PL) 2. Electron Paramagnetic Resonance (EPR)

  9. Photoluminescence (PL) R line luminescence of doped Cr3+ in LaAlO3[1] LaAlO3 Single crystal Wavelength [nm] The PL spectral shapes are very similar. Presence of Cr3+ impurityis indicated by PL. [1] J. Heber et al.,: Z. Phys. 246 (1971) 261.

  10. Electron Spin Resonance (ESR) Crystal field of octahedralsymmetry H: Magnetic field The ESR spectral shapes are very similar. Presence of Cr3+ impurityis indicated by ESR and PL. H is parallel to direction of （111）. Angle-resolved EPR spectra of the LaAlO3 single crystal (111) at room temperature. Angler dependence of the spectrum of Cr3+ in LaAlO3.[2] [2] D. Kiro, W. Low and A. Zuman, Paramagnetic Resonance vol 1, ed. W. Low, (New York, Academic, 1962), pp. 44-50.

  11. Applied Optics Gr. -Biosensor- Biosensor Biomolecules can be detected! Specific adsorption Analyte Analyte Signal converter PC # Excitation of waveguide mode # Surface plasmon resonance etc… Proteins, cells, …

  12. Waveguide mode Teflon cuvette Our previous research Biosensingsystemusingawaveguide-modesensor Ex. Detection of streptavidin (A kind of protein) Detector Before adsorption After adsorption  Laser Prism 1 Polarizer Reflection layer Reflectance Waveguide Streptavidin (SA) Biotin probe (Vitamin) Angle shift 0 Kretschmann configuration Incident angle This system : sensitive compared with conventional SPR sensors (~ 40 times).

  13. Present research (1) Present research Ultrasensitive biomolecular detection Previous method Improved method Au nanoparticles (Opaque) Streptavidin (SA) (Transparent substance) SA labeled with Au nanoparticles Ultrasensitive detection of SA by labeling with Au nanoparticles (Au-SA).

  14. Present research (2) Experimental procedures Immobilization of biotin on the surface Measurement of reflectance SiO2 glass prism He-Ne laser 30o Injection of solution (10 pM Au-SA) Detector q SiO2 glass substrate Polarizer After 20 hours Si layer Biotin Measurement of reflectance probe Comparison of reflection spectra before and after the Au-SA adsorption. Au-SA SiO2 glass layer

  15. Present research (3) SEM image of the surface after the adsorption of Au-SA Au-SA 500 nm Average number density : 2 mm-2

  16. Au-SA Present research (4) Ultrasensitive detection of SA by labeling with Au nanoparticles -0.053 ○Before adsorption of Au-SA△After adsorption of Au-SA Au-SA with a number density of only 2 mm-2 can be detected.

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