Modification of Structural and Luminescence Properties of Graphene Quantum Dots by Gamma Irradiation and Their Application in a Photodynamic Therapy

Aurelio Bonasera, Zois Syrgiannis, Zoran M. Marković, Svetlana P. Jovanović, Dušan D. Milivojević, Dejan P. Kepić, Vuk D. Spasojević, Milica D. Budimir, Aurelio Bonasera, Vladimir B. Pavlović, Biljana M. Todorović Marković, Miroslav D. Dramićanin

Research output: Contribution to journalArticlepeer-review

88 Citations (Scopus)

Abstract

Herein, the ability of gamma irradiation to enhance the photoluminescence properties of graphene quantum dots (GQDs) was investigated. Different doses of γ-irradiation were used on GQDs to examine the way in which their structure and optical properties can be affected. The photoluminescence quantum yield was increased six times for the GQDs irradiated with high doses compared to the nonirradiated material. Both photoluminescence lifetime and values of optical band gap were increased with the dose of applied gamma irradiation. In addition, the exploitation of the gamma-irradiated GQDs as photosensitizers was examined by monitoring the production of singlet oxygen under UV illumination. The main outcome was that the GQDs irradiated at lower doses act as better photoproducers than the ones irradiated at higher doses. These results corroborate that the structural changes caused by gamma irradiation have a direct impact on GQD ability to produce singlet oxygen and their photostability under prolonged UV illumination. This makes low-dose irradiated GQDs promising candidates for photodynamic therapy.
Original languageEnglish
Pages (from-to)25865-25874
Number of pages10
JournalACS APPLIED MATERIALS & INTERFACES
Volume7
Publication statusPublished - 2015

All Science Journal Classification (ASJC) codes

  • General Materials Science

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