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

JovanoviÄ , Svetlana P
•
SYRGIANNIS, ZOIS
•
MarkoviÄ , Zoran M.
altro
TodoroviÄ MarkoviÄ , Biljana M.
2015
  • journal article

Periodico
ACS APPLIED MATERIALS & INTERFACES
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.
DOI
10.1021/acsami.5b08226
WOS
WOS:000366005600040
Archivio
http://hdl.handle.net/11368/2894643
info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84948682203
http://pubs.acs.org/journal/aamick
Diritti
closed access
FVG url
https://arts.units.it/request-item?handle=11368/2894643
Soggetti
  • gamma irradiation

  • graphene quantum dot

  • photodynamic therapy

  • photoluminescence

  • quantum yield

Web of Science© citazioni
86
Data di acquisizione
Mar 21, 2024
Visualizzazioni
1
Data di acquisizione
Apr 19, 2024
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