Biosynthesis of gold
nanoparticles using diatoms—silicagold
and EPS-gold
bionanocomposite formation
Abstract Novel
synthesis of gold nanoparticles, EPS-gold,
and silica-gold bionanocomposites by biologically
driven processes employing two diatom strains
(Navicula atomus, Diadesmis gallica)is described.
Transmission electron microscopy (TEM) and
electron diffraction analysis (SAED) revealed a presence of gold nanoparticles in the experimental solutions of the diatom culture mixed
with tetrachloroaureate. Nature of the gold
nanoparticles was confirmed by X-ray
diffraction studies. Scanning electron
microscopy (SEM) and TEM showed that the
nanoparticles were associated with the diatom frustules and extracellular polysaccharides (EPS)
excreted by the
diatom cells. Due to its accessibility, simplicity, and effectiveness, this
method of nanocomposites preparation has great
importance for possible future
applications.
Keywords
Composite _ Diadesmis gallica _ Diatoms
_ EPS _ Frustule
_ Gold _ Nanoparticles
_ Navicula
atomus _ Silica[HOW TO DOWNLOAD OR READ MORE]
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