Norishige Nanai

Structures of vanadyl phthalocyanine in bilayers of vanadyl phthalocyanine and perylenetetracarboxylic dianhydride

The structures of vanadyl phthalocyanine (VOPc) in the bilayer of VOPc and perylenetetracarboxylic dianhydride (PTCDA) were found to be affected by the sequence of the deposition. When PTCDA was deposited first on the quartz glass substrate followed by VOPc, VOPc took the phase I structure whose X-ray diffraction analyses showed a sharp diffraction line corresponding to the layer distance, 0.68 nm and 0.34 nm. The VOPc films deposited on glass took the phase II structure. The structure of PTCDA was α-type which did not depend on the sequence of the deposition.

Polarized optical absorption spectra of orientation aligned vanadyl phthalocyanine films

Abstract Optical absorption spectra (400∼900 nm) of vanadyl phthalocyanine (VOPc) films deposited on perylenetetracarboxylic dianhydride (PTCDA) films formed on mica (VOPc/PTCDA/mica) depended on orientation of polarization plane of incident light. This means that orientations of VOPc and PTCDA molecules in VOPc/PTCDA/mica align. Since the absorption spectrum of the VOPc film with thickness 100 nm in the VOPc/PTCDA/mica formed at 60 °C corresponded to that of I-TiOPc, structure of the VOPc film was supposed to be close to I-TiOPc. Without the PTCDA film, orientation aligned II-VOPc film was formed on mica kept at 100 °C.

Effects of mono-substituted phenol additives on the electrical and mechanical properties of electrochemically synthesized polypyrrole

Abstract Polypyrrole (PPy) which is electrochemically synthesized with a mono-substituted phenol additive has enhanced conductivity, thermal stability and tensile strength. From elemental analysis data, mass spectra and FT-IR spectra, there is no obvious evidence that the additive is incorporated in PPy. Electronic absorption spectra and laser Raman spectra show that the additive reduces the polaron peak and enhances the bipolaron peak. The increased structural regularity is considered to be the reason for the improvement of the electrical and mechanical properties.

Materials Science of Conducting Polymers: An Approach to Solid Electrolytic Capacitors with a Highly-Stable Polypyrrole Thin Film

Abstract This paper summarizes the present status of materials science of conducting polymers relevant to the their technological applications. This paper also describes the development of solid electrolytic capacitors utilizing conducting-polymer thin films as a solid electrolyte. The capacitors are characterized by excellent frequency, temperature and life stabilities and have been put into commercial use in large quantity.