One-pot synthesis of graphene quantum dots–phthalocyanines supramolecular hybrid and the investigation of their photophysical properties

Gertrude Fomo, Ojodomo J. Achadu, Tebello Nyokong

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

The synthesis of graphene quantum dots (GQDs) using organic compounds as carbon sources via bottom-up approaches has been widely developed, whereas their hybrids with other materials have been previously achieved post-synthetically via multi-step procedures. A novel approach for the preparation of supramolecular hybrid conjugates of GQDs and phthalocyanines (Pcs) via an in situ one-step bottom-up route was employed in this study. The as-synthesized GQDs and their Pc conjugates were characterized using different spectroscopic techniques and their photophysicochemical properties evaluated. Notably, the singlet oxygen quantum yields of the Pcs in the presence of GQDs were found to be 0.51 and 0.74 for 1-GQDs and 2-GQDs, respectively, as compared to the Pcs alone (0.18 and 0.70 for complex 1 and 2, respectively). The increase in triplet quantum yield (ΦT) values is complemented by a decrease in fluorescence quantum yield (ΦF). ΦT value of 0.96 obtained for the complex 2 after conjugation with GQDs is better or higher than the value of 0.74 as reported in the literature when complex 2 was conjugated to semiconductor QDs. Hence, this novel approach resulted in the derivation of hybrid materials with potentials for various photophysicochemical applications such as photodynamic therapy and photocatalysis.

Original languageEnglish
Pages (from-to)538-548
Number of pages11
JournalJournal of Materials Science
Volume53
Issue number1
DOIs
Publication statusPublished - 5 Sep 2017

Bibliographical note

Funding Information:
This work was supported by the African Laser Centre (ALC), the Department of Science and Technology (DST), CSIR National Laser Centre, Rental Pool Program, National Research Foundation (NRF) of South Africa through DST/NRF South African Research Chairs Initiative for Professor of Medicinal Chemistry and Nanotechnology (UID 62620), and Rhodes University.

Publisher Copyright:
© 2017, Springer Science+Business Media, LLC.

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