论文部分内容阅读
Creation of a stereoselective solid surface is one of the most challenging subjects for its wide applications to optical device microelectronic devices and sensors.In this study,a series of chiral sensing electrods have been fabricated by coating ITO elctrodes with hybrid film of metal complex and an inorganic monolayer such as titanium dioxide and montmorillonite,respectively.By applying t(h) combined methods of Langmuir-Blodgett (LB) and self-assembly techniques,a monolayer of a water-soluble chiral metal (Ru and O(s) complex,which acted as a mediator of oxidizing a target molecule,was fixed electrostatically onto an inorganic monolayer film.Chir(a) sensing was demonstrated by monitoring a photocurrent when the modified electrode was in contact with an aqueous NaClO4 solution (o) 1,1-2-binaphthol or 1,1-2-binaphthylamine.Our studies illustrated that a large photocurrent difference (more than 1.5 times) w(a) authentically observed between S-1,1-2-binaphthol and the R-isomer at the applied potential of over 600 mV (vs Ag |AgCl|KCl (sat) Mechanisms for chiral sensing effect were also explained in terms of the stereoselective binding of 1,1-2-binaphthol with adsorbed chir(a) metal complex on an inorganic monlayer surface.Moreover,it was revealed that the photocurrent density decreased with an increasi(n) number of layers of hybrid films,indicating that the harvesting of photoexcited electrons vertically through the inorganic nanosheets was n(o) efficient.For efficient photocurrent generation,a lateral interlayer connection to all of the inorganic nanosheets with Ag paste was used a(n) thus a dramatic improvement in the sensitivity of chiral sensing was obtained.Such results may open up a a new way for preparing chir(a) sensors and biosensors.