Defective VOPcPhO nanotubes for improved optical properties


Shayyidatul Athirah Abdul Manaf1, Nor Asmaliza Bakar1, Rosdiyana Samad2, Azzuliani Supangat1,3


1 Department of Physics, Faculty of Science,

University of Malaya, Kuala Lumpur 50603, Malaysia


2 Faculty of Electrical and Electronic Engineering,

University of Malaysia Pahang, Pekan, Pahang 26600, Malaysia


3 Low Dimensional Materials Research Centre, Faculty of Science,

University of Malaya, Kuala Lumpur 50603, Malaysia


Corresponding author:




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.


Keywords: defect; nanotubes; optical properties





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