Contributors: University of Belgrade Belgrade; Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN); Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA); Université catholique de Lille (UCL)-Université catholique de Lille (UCL); Circuits Systèmes Applications des Micro-ondes - IEMN (CSAM - IEMN); Université catholique de Lille (UCL)-Université catholique de Lille (UCL)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA); Faculty of Polymer Technology; This work was supported by the EU Horizon Europe program Coordination and Support Action, project “Twinning for new graphene-based composites in electromagnetic interference shielding”-GrInShield No. 101079151 , and by the Science Fund of the Republic of Serbia, #7741955, “Are photoactive nanoparticles salvation for global inflectional treath?”-PHOTOGUN4MICROBES and by the Ministry of Science, Technological Development and Innovation of the Republic of Serbia grant number 451-03-47/2023-01/200017 . The authors acknowledge the Electron and Light Microscopy Service Unit of the School of Mathematics and Science of the Carl von Ossietzky University for the use of the JEOL JEM-2100F 200 kV TEM facility.; European Project: 101079151,10.3030/101079151,GrInShield(2022)
نبذة مختصرة : International audience ; Silver nanoparticles (Ag NPs) have been produced by low-dose (1-20 kGy) gamma irradiation of silver nitrate in the presence of graphene-based material (graphene oxide or electrochemically exfoliated graphene). The large surface area of those graphene-based materials combined with the presence of oxygen-containing functional groups on the surface provided successful nucleation and growth of Ag nanoparticles, which resulted in a uniformly covered graphene surface. The obtained Ag nanoparticles were spherical with a predominant size distribution of 10-50 nm for graphene oxide and 10-100 nm for electrochemically exfoliated graphene. The photothermal efficiency measurement showed a temperature increase upon exposure to a 532 nm laser for all samples and the highest photothermal efficiency was measured for the graphene oxide/Ag NP sample prepared at 5 kGy. Electromagnetic interference (EMI) shielding efficiency measurements showed poor shielding for the composites prepared with graphene oxide. On the other hand, all composites prepared with electrochemically exfoliated graphene showed EMI shielding to some extent, and the best performance was measured for the samples prepared at 5 and 20 kGy doses.
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