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K.Kaneto,D.Tanimura,W.Takashima 한국물리학회 2004 Current Applied Physics Vol.4 No.6
Electrical properties at the nanointerfaces of head-to-tail coupled poly(3-hexylthiophene), PHT and metals (Au, Al) in sandwichtype Al/PHT/Au diodes have been investigated using a nanomanipulator with the potential probing tip. It has been directly foundthat the highly insulating layer and the appreciable contact resistance are formed at Al/PHT with the thickness of several tensnanometer and PAT/Au, respectively. The bias dependence of the interface resistances at Al/PHT shows the origin of rectication. Ithas also been found that the interface resistance at PAT/Au is unexpectedly large, though the currentvoltage behavior is ohmic.The results indicate the contact resistances between PHT and metals at the nanometric region are important factors to determine the diode performance.
Rajesh,K.Kaneto 한국물리학회 2005 Current Applied Physics Vol.5 No.2
A conducting polymer film of N-amino substituted pyrrole monomer has been prepared for covalent immobilization of enzyme for biosensing applications, illustrated by tyrosinase (PPO).The tyrosinase enzyme retains its bioactivity when being immobilized on N-substituted pyrrole polymer film by covalent bonding.The enzyme electrode was characterized by UV.Vis and infrared spectroscopy.Phenolic compounds were quantitatively estimated by the direct electrochemical reduction of enzymatically liberated quinone species at 0.2 V vs. Ag/AgCl. The results of amperometric response measurements conducted on enzyme electrode show sensitivity of 57.6, 71.4 and 45.8 mAM1cm2 and a linear response range of 1.8.170.2, 1.3.110.1 and 2.1.168 lM for phenol, catechol and p-cresol, respectively. The biosensor exhibits a lowest detection limit of 0.9, 0.7 and 1.1 lM, for phenol, catechol and p-cresol, respectively and a period of stable sensitivity of 3 months at 4.5 C.
Rajesh,S.S. Pandey,W. Takashima,K. Kaneto 한국물리학회 2005 Current Applied Physics Vol.5 No.2
A conducting polypyrrole lm has been prepared on indium tin oxide coated glass plate by electropolymerization of pyrrole in anaqueous solution of enzyme, tyrosinase (PPO), and a redox mediator potassium hexacyanoferrate (II). The enzyme retains its bio-activity well within the polymer lm. Phenol concentration in aqueous solution was quantitatively estimated by monitoring the elec-tron exchange occurring in redox mediator within the polymer matrix i.e. direct reduction of Fe (III) to Fe (II) ion at +0.12V vs. Ag/AgCl. The results of amperometric response measurements conducted on enzyme electrode (PPO/Fe2+/PPY/ITO) show a sensitivityof 0.33 AM. 1 cm. 2 and a linear response range of 4.5107.4l M for phenol in aqueous medium. The electrode exhibits a responsetime of about 80 second and is stable for 4 months at 4.C..