title: Direct nucleation of silver nanoparticles on graphene sheet.
abstract: Silver (Ag) nanoparticles were synthesized on the surface of graphene sheet by the simultaneous reduction of Ag+ and graphene oxide (GO) in the presence of simple reducing agent, hydrazine hydrate (N2H4 x H2O). Both the Ag+ and GO were reduced and Ag+ was nucleated onto graphene. GO flakes were prepared by conventional chemical exfoliation method and in the presence of strong acidic medium of potassium chlorate. Silver nanoparticles were prepared using 0.01 M AgNO3 solution. The reduced GO sheet decorated with Ag is referred as G-Ag sample. G-Ag was characterized by FTIR (Fourier transform infrared) spectroscopy using GO as standard. An explicit alkene peak appeared around 1625 cm(-1) was observed in G-Ag sample. Besides, the characteristic carbonyl and hydroxyl peaks shows well reduction of GO. The FTIR therefore confirms the direct interaction of Ag into Graphene. SEM (scanning electron microscopy) and TEM (transmission electron microscopy) analysis were performed for morphological probing. The average size of Ag nanoparticles was confirmed by around 5-10 nm by the high-resolution TEM (HRTEM). The Ag quantum dots incorporated nanocomposite material could become prominent candidate for diverse applications including photovoltaic, catalysis, and biosensors etc.
authors.affiliation: Centre for Mechanical Technology and Automation, University of Aveiro, Aveiro, 3810-193, Portugal.
authors.forename: Manoj K
authors.initials: MK
authors.lastname: Singh
authors.forename: E
authors.initials: E
authors.lastname: Titus
authors.forename: R
authors.initials: R
authors.lastname: Krishna
authors.forename: R R
authors.initials: RR
authors.lastname: Hawaldar
authors.forename: G
authors.initials: G
authors.lastname: Goncalves
authors.forename: P A A P
authors.initials: PA
authors.lastname: Marques
authors.forename: J
authors.initials: J
authors.lastname: Gracio