Philippine Science Letters
vol. 6 | no. 1 | 2013
published online June 21, 2013


Interaction of Diatom Silica with Graphene

by Juliet Q. Dalagan1,2* and Erwin P. Enriquez2

1 Chemistry Department, Xavier University-Ateneo de Cagayan, Corrales Avenue, Cagayan de    Oro City, 9000
2 Department of Chemistry, Ateneo de Manila University, Loyola Heights, Quezon City, 1108



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.

*Corresponding author
Email Address:
Received: October 14, 2012
Revised: May 10, 2013
Accepted: May 21, 2013
Published: June 21, 2013
Editor-in-charge: Gisela P. Padilla - Concepcion