DEFECTIVE VOPCPHO NANOTUBES FOR IMPROVED OPTICAL PROPERTIES

Abstract

In this study, the synthesis of defect-free and defective vanadyl 2,9,16,23-tetraphenoxy 29H,31H-phthalocyanine (VOPcPhO) nanotubes via templating method is reported. VOPcPhO nanotubes are successfully grown by immersing the porous alumina template into 5 and 15 mg/ml of solution concentration for 24 hours and annealed at 150 °C. Changes in morphological and optical properties are observed as the solution concentration is varied. Interestingly, defective VOPcPhO nanotubes that obtained from the higher solution concentration of 15 mg/ml recorded enhancement in optical properties. Defects by means of voids and circular-shaped holes along the nanotubes have caused to the reduction of nanotubes’ diameter. Defective nanotubes that contribute to improve optical properties have been postulated to have low band-gap energy and enhanced photoluminescence quenching.