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Issue 41, 2006
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Controlled pore structure modification of diatoms by atomic layer deposition of TiO2

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Abstract

Diatoms produce diverse three-dimensional, regular silica structures with nanometer to micrometer dimensions and hold considerable promise for biological or biomimetic fabrication of nanostructured materials and devices. The unique hierarchical porous structure of diatom frustules is in particular attractive for membrane applications in microfluidic systems. In this paper, a procedure for pore size modifications of two centric diatom species, Coscinodiscus sp. and Thalassiosira eccentrica (T. eccentrica) using the atomic layer deposition (ALD) of ultrathin films of titanium oxide (TiO2) is described. TiO2 is deposited by sequential exposures to titanium chloride (TiCl4) and water. The modified diatom membranes were characterized using scanning electron microscopy (SEM), atomic force microscopy (AFM), energy dispersive X-ray analysis (EDAX), and secondary ion mass spectrometry (SIMS). These techniques confirmed the controlled reduction of pore sizes while preserving the shape of the diatom membrane pores. Pore diameters of diatom membranes can be further tailored for specific applications by varying the number of cycles and by changing their surface functionality.

Graphical abstract: Controlled pore structure modification of diatoms by atomic layer deposition of TiO2

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Publication details

The article was received on 17 Jul 2006, accepted on 17 Aug 2006 and first published on 04 Sep 2006


Article type: Paper
DOI: 10.1039/B610188G
Citation: J. Mater. Chem., 2006,16, 4029-4034
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    Controlled pore structure modification of diatoms by atomic layer deposition of TiO2

    D. Losic, G. Triani, P. J. Evans, A. Atanacio, J. G. Mitchell and N. H. Voelcker, J. Mater. Chem., 2006, 16, 4029
    DOI: 10.1039/B610188G

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