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Elucidating synthesis of noble metal nanoparticles/graphene oxide in freescavenger γ-irradiation
Jie Shi,Wanwei Jiang,Liangsen Liu,Miaolei Jing,Fengyan Li,Zhiwei Xu,Xing-xiang Zhang 한국물리학회 2019 Current Applied Physics Vol.19 No.7
Three representative noble metal (Ag, Au and Pt) nanoparticles decorated graphene oxide (NMNPs/GO) composites were fabricated via γ-irradiation without scavenger. The NMNPs/GO composites exhibited the pure and well-dispersed particles structure, which directly illustrated that the GO could be acted as scavenger to benefit reduction and growth of NMNPs. Compared with irradiated GO (IGO), the GO substrate of composites had the lower relative content of hydroxyl groups, meanwhile, the relative contents of carbonyl groups (Pt > Au > Ag) were increased with increasing valence of noble metal. Such results illustrated that the abundant hydroxyl groups could convert the hydrated electrons, hydroxyl and hydrogen radicals to promote the growth of NMNPs on the surface of GO. In addition, the Raman signals of Ag NPs/GO composites were significantly enhanced (6.18 fold more than pristine GO, respectively), exhibiting obvious surface-enhanced Raman scattering activity. Therefore, this paper revealed that the GO could convert the hydrated electrons and radicals to synthetizing NMNPs/GO composites during γ-ray irradiation.
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