Rapid systhesis of graphene nanosheets and its structural properties study for direct methanol fuel cell

Abstract

Titanium dioxide nanofibers with diameter ranging to several nanometers were synthesized via electrospinning technique. The precursor solution was prepared by mixing the polyvinylpyrrolidone, PVP (MW-l,300,OOO) in ethanol, meanwhile titanium tetraisopropoxide, TTIP in acetic acid was slowly added into the solution under a vigorous stirring. The precursor solutions were then used in the electrospinning process under high voltage supply. As-spun nanofibers were heatted. under different temperature 400°C, 500°C and 600°C. The TiO2 nanofibers were characterized by using ,scanning electron microscopy (SEM), Brunauer Emmett-Teller (BET) and X-raY .diffraction (XRD). The results indicated that the heat treated Ti02 nanofibers consist of anatase and rutile phases. As the calcination temperature increased (400-500C), the anatase phase are greater than rutile phase and specific surface area are decreases while the calcination process influenced the nanofibers diameter.