6533b839fe1ef96bd12a6491

RESEARCH PRODUCT

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

Zoran MarkovićVladimir B. PavlovićSvetlana JovanovicZois SyrgiannisMiroslav D. DramićaninDušan MilivojevićMilica D. BudimirVuk D. SpasojevićBiljana M. Todorović-markovićAurelio BonaseraDejan P. Kepić

subject

PhotoluminescenceMaterials scienceLuminescenceBand gapQuantum yieldgraphene quantum dot02 engineering and technology010402 general chemistryPhotochemistryMicroscopy Atomic Force01 natural scienceslaw.inventionchemistry.chemical_compoundlawQuantum DotsSpectroscopy Fourier Transform InfraredGeneral Materials ScienceIrradiationParticle SizePhotosensitizing Agentsgraphene quantum dotsSinglet OxygenGraphenebusiness.industrySinglet oxygenElectron Spin Resonance Spectroscopy021001 nanoscience & nanotechnologygamma irradiation0104 chemical scienceschemistryPhotochemotherapyphotodynamic therapyQuantum dotGamma Raysgamma irradiation; graphene quantum dots; photodynamic therapy; photoluminescence; quantum yieldOptoelectronicsGraphiteSpectrophotometry Ultravioletphotoluminescence0210 nano-technologyLuminescencebusinessquantum yield

description

Herein, the ability of gamma irradiation to enhance the photoluminescence properties of graphene quantum dots (GQDs) was investigated. Different doses of gamma-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.

yearjournalcountryeditionlanguage
2015-01-01
10.1021/acsami.5b08226http://aspace.agrif.bg.ac.rs/handle/123456789/3755