Effects of low gamma irradiation dose on the photoluminescence properties of graphene quantum dots

被引：10
作者：
Jovanovic, Svetlana [1 ]
Markovic, Zoran [1 ,2 ]
Budimir, Milica [1 ]
Spitalsky, Zdenko [2 ]
Vidoeski, Bojan [1 ]
Markovic, Biljana Todorovic [1 ]
机构：
[1] Univ Belgrade, Vinca Inst Nucl Sci, Mike Petrov Alasa 12-14, Belgrade 11001, Serbia
[2] Slovak Acad Sci, Inst Polymer, Dubravska Cesta 9, Bratislava, Slovakia
来源：
OPTICAL AND QUANTUM ELECTRONICS | 2016年 / 48卷 / 04期
关键词：
Graphene quantum dots; Photoluminescence; Gamma irradiation; Atomic force microscopy; CARBON NANOTUBES; WATER; GREEN; FABRICATION; GRAPHITE; ACID;
D O I：
10.1007/s11082-016-0516-z
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
We prepared graphene quantum dots (GQDs) using electrochemical approach. The luminescent properties of GQDs at various excitation wavelengths are examined. In order to study the possibility to improve these properties, we applied a low dose of gamma irradiation (15 kGy) on GQDs dissolved in two media: water and 4 % isopropyl alcohol solution. Upon gamma irradiation of water, various free radical species are formed and they usually cause oxidation. In the presence of isopropyl alcohol in water, during irradiation, oxygen contained radicals are quenched and only hydrogen radicals can survive and reduce the material exposed to irradiation. Morphology of GQDs is examined by atomic force and transmission electron microscopy. After gamma irradiation the increase of photoluminescence was noticed for both GQD samples. A higher intensity of photoluminescence is detected for GQDs irradiated in 4 % isopropyl alcohol solution. This result shows that further increase of gamma irradiation dose has a great potential for improvement of luminescence properties of GQDs.
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页数：7
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