Abstract
A method for situ preparing a hybrid material consisting of silica nanoparticles (SiO2) attached onto the surface of functionalized graphene nanoplatelets (f-GNPs) is proposed. Firstly, polyacrylic acid (PAA) was grafted to the surface of f-GNPs to increase reacting sites, and then 3-aminopropyltriethoxysilane (APTES) KH550 reacted with abovementioned product PAA-GNPs to obtain siloxane-GNPs, thus providing reaction sites for the growth of SiO2 on the surface of GNPs. Finally, the SiO2/graphene nanoplatelets (SiO2/GNPs) hybrid material is obtained through introducing siloxane-GNPs into a solution of tetraethyl orthosilicate, ammonia and ethanol for hours' reaction. The results from Fourier transform infrared spectroscopy (FTIR) showed that SiO2 particles have situ grown on the surface of GNPs through chemical bonds as Si-O-Si. And the nanostructure of hybrid materials was characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). All the images indicated that SiO2 particles with similar sizes were grafted on the surface of graphene nanoplatelets successfully. And TEM images also showed the whole growth process of SiO2 particles on the surface of graphene as time grows. Moreover, TGA traces suggested the SiO2/GNPs hybrid material had stable thermal stability. And at 900°C, the residual weight fraction of polymer on siloxane-GNPs was about 94.2% and that of SiO2 particles on hybrid materials was about 75.0%. However, the result of Raman spectroscopy showed that carbon atoms of graphene nanoplatelets became much more disordered, due to the destroyed carbon domains during the process of chemical drafting. Through orthogonal experiments, hybrid materials with various sizes of SiO2 particles were prepared, thus achieving the particle sizes controllable. And the factors’ level of significance is as follows: the quantity of ammonia > the quantity of tetraethyl orthosilicate (TEOS) > the reaction time.
Highlights
Graphene, a single layer carbon material in a close arrangement of honeycomb two-dimensional lattice [1], has remarkable properties, such as Young's modulus, fracture strength, specific surface area and so on [2,3,4]
We introduced an easy and facial methodology to prepare functionalized graphene nanoplatelets (f-Graphene nanoplatelets (GNPs)/silica nanoparticles (SiO2)) hybrid materials, using polyacryloyl chloride (PACl) as the bridge to connect graphene platelets and SiO2 particles
It is well known that the typical features of carbon materials in Raman spectra are the G band at 1,580 cm−1 deriving from the E2g phonon of C sp2 atoms and D band at 1,350 cm−1 considered as a breathing mode of k-point photos of A1g symmetry which is assigned to local defects and disorder mostly at the edges of f-GNP platelet [33,34]
Summary
A single layer carbon material in a close arrangement of honeycomb two-dimensional lattice [1], has remarkable properties, such as Young's modulus, fracture strength, specific surface area and so on [2,3,4]. Researchers have shown an increasing interest in graphene-based composites [16,17] in which graphene sheets are used as a wild phase to enhance mechanical properties [18] Among all these materials, hybrid materials based on GNPs and silica nanoparticles have attracted significant scientific interest because of their remarkable properties that do not exist in the individual components [19,20,21,22]. Considering the outstanding properties of graphene nanoplatelets and SiO2, graphene/silica composite would be one of the greatly popular and interest topics in the field of nanomaterial and nanotechnology [24] This kind of composite materials have been explored as adsorbents [25,26], catalysts [27], and fillers into resin for composites along with an excellent application potential [28,29]
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