Photophysical studies of graphene quantum dots - Pyrene-derivatized porphyrins conjugates when encapsulated within Pluronic F127 micelles

Muthumuni Managa, Ojodomo J. Achadu, Tebello Nyokong

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

Pyrene-derivatized H2, GaCl, and Zn porphyrins were immobilized on graphene quantum dots (GQDs) to form (GQDs-H2TPrP, GQDs-GaClTPrP, and GQDs-ZnTPrP) conjugates through the π-π stacking interaction method followed by encapsulating into Pluronic F127 micelles to form (GQDs-H2TPrP + F127, GQDs-GaClTPrP + F127, and GQDs-ZnTPrP + F127). Spectroscopic evidence shows that the resultant conjugates were stable due to the strong π-π stacking interaction between the GQDs and the porphyrins. The fluorescence and singlet oxygen generating behaviour of the porphyrins were investigated following incorporation. GQDs-GaClTPrP + F127 showed highest values of the binding constant (Kb). The Stern-Volmer constant (Ksv) for GQDs-ZnTPrP + F127 were the highest compared to other porphyrins derivatives.

Original languageEnglish
Pages (from-to)405-416
Number of pages12
JournalDyes and Pigments
Volume148
DOIs
Publication statusPublished - 18 Sep 2017

Bibliographical note

Funding Information:
This work was supported by the Department of Science and Technology (DST) / Nanotechnology (NIC) and 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 Elsevier Ltd

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