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Masaru Matsuo

Masaru Matsuo

Dalian University of Technology, China

Title: Iodine-doping effect of nano-particle/polymer composites

Biography

Biography: Masaru Matsuo

Abstract

Iodine-doping effect provided significant development of nano-particles/polymer composites. This presentation is concerned with two examples. 1) drastic increase in electric conductivity of iodine-doped carbon nanotubes (CNTs)/ultrahigh molecular weight polyethylene (UHMWPE) films, CNT content being beyond 4 vol%, elongated up to 50 times. Young’s modulus of and conductivity of the composite reached 25 GPa and 0.1 S/cm, respectively. The mechanism responsible for the conductivity increase was analyzed by Raman spectroscopy in terms of bond polarization. The Raman spectroscopy indicated that doped iodine existed as I5- which acts as the charge carriers to form charge transfer complex. Namely, I5- provided an increase in charge carriers linked to the CNTs and could be taken as bridge for the adjacent or nearly CNTs. Thus, the iodine-doping contributed to development of the composite with high electric conductivity and high mechanical property. The high Young’s modulus was due to extremely preferential orientation of UHMEPE chain axes with respect to the stretching direction. 2) preparation of tough titanium/carbon composite with smooth film surface with mixed types of anatase form and rutile form. Poly(vinyl alcohol) (PVA) and titanium dioxide (TiO2) composite films were prepared by gelation/crystallization from dispersed solution containing TiO2 particles against PVA. The incorporation of iodine into the composites was done and the iodine-incorporation composites were carbonized under argon gas in the temperature range of 700-1600°C. No disruption of the composite was found to be due to the appearances of Ti2O3 groups and the Ti-C structure performing cross-linking between neighboring amorphous carbon chains. Under the carbonization process, iodine-incorporation played an important role as a catalyst to promote the formation of the cross-linking between amorphous carbon chains through the resultant Ti-C structure that occurs by hydration. The coagulated TiO2 powders in the composite film carbonized at 1200°C maintained a predominantly anatase-type as has been generally known as photo-catalytic activity. The perfect transition to the rutile-type dramatically occurred at 1600°C.