Interaction of Diatom Silica with Graphene
In this present work, the synthesis and characterization of graphene-diatom silica were studied. Diatom silicagraphene composite was prepared via the adsorption of graphene suspension into diatom silica extracted from 3 different species, namely Amphora sp., Navicula ramossisira and Skeletonema sp. The adsorption proceeded to yield a black solid material that is composed of silica and graphene. The concentrations of graphene in the 3 diatom species based on thermogravimetric and UV-Vis spectroscopic methods were 0.306 mg/mL, 0.449 mg/mL and 0.188 mg/mL for Amphora sp., Navicula ramossisira and Skeletonema sp., respectively. Raman spectroscopy of the graphene-diatom silica revealed band shifts in the D, G and 2D peaks which are indicative of an interaction between graphene and diatom silica. Scanning Electron Microscopic (SEM) images also illustrate presence of graphene on diatom silica.
Dalagan, J., Enriquez, E. (2013). Interaction of Diatom Silica with Graphene. Philippine Science Letters, 6(1), 119-127