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RESEARCH PRODUCT
Structural and thermal stability of graphene oxide-silica nanoparticles nanocomposites
Luigi BottaSimonpietro AgnelloAntonino AlessiAntonino AlessiAndrea MaioGianpiero BuscarinoAurora PiazzaRoberto Scaffarosubject
Materials scienceOxideNanoparticleInfrared spectroscopyNanotechnology02 engineering and technology010402 general chemistry01 natural scienceslaw.inventionchemistry.chemical_compoundsymbols.namesakeX-ray photoelectron spectroscopylawMaterials ChemistryNanosilicaThermal stabilityGraphene oxideNanocompositeGrapheneMechanical EngineeringMetals and AlloysThermal stability021001 nanoscience & nanotechnology0104 chemical scienceschemistryMechanics of MaterialsRaman spectroscopysymbolsNanohybrid0210 nano-technologyRaman spectroscopydescription
Abstract The investigation of the thermal stability up to 400 °C of Graphene Oxide (GO) and GO-silica nanoparticles (n-SiO2) composites prepared by direct mixture of GO and n-SiO2 is reported. Using Scanning Electron Microscopy, X-ray Photoelectron Spectroscopy, Energy Dispersive X-ray analysis, Atomic Force Microscopy, Raman and Infrared absorption measurements a thorough characterization of the prepared materials is carried out. By deepening the changes induced in the 2D Raman spectral region of GO at about 2900 cm−1 the comprehension of an interplay, driven by the thermally induced changes of the material, between inter-valley and intra-valley vibrational transitions is elucidated. This result enables to find out that the major thermally induced changes are related to the GO counterpart of the nanocomposite and shows that the deposited silica nanoparticles are not interfering with the GO principal features exploiting the potentiality of nanocomposites preparation. Furthermore, silica nanoparticles are found to act as solid exfoliant agents, thus inhibiting GO lamellae re-aggregation even at high temperatures.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2017-02-01 |