Journal
JOURNAL OF NANOPARTICLE RESEARCH
Volume 13, Issue 8, Pages 3207-3216Publisher
SPRINGER
DOI: 10.1007/s11051-011-0221-6
Keywords
Composite; Diadesmis gallica; Diatoms; EPS; Frustule; Gold; Nanoparticles; Navicula atomus; Silica
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Funding
- Czech Ministry of Education, Youth and Sports [MSM 6198910016, MSM 6007665801]
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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.
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