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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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Article information


Submitted
17 Jul 2006
Accepted
17 Aug 2006
First published
04 Sep 2006

J. Mater. Chem., 2006,16, 4029-4034
Article type
Paper

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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