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Title: Controlled pore structure modification of diatoms by atomic layer deposition of TiO2
Authors: Losic, D
Triani, G
Evans, PJ
Atanacio, AJ
Mitchell, JG
Voelcker, NH
Keywords: Diatoms
Titanium oxides
Titanium chlorides
Scanning electron microscopy
Atomic force microscopy
Issue Date: 4-Sep-2006
Publisher: Royal Society of Chemistry
Citation: Losic, D., Triani, G., Evans, P. J., Atanacio, A., Mitchell, J. G., & Voelcker, N. H. (2006). Controlled pore structure modification of diatoms by atomic layer deposition of TiO 2. Journal of Materials Chemistry, 16(41), 4029-4034. doi:10.1039/B610188G
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.© The Royal Society of Chemistry 2006
Gov't Doc #: 9784
ISSN: 0959-9428
Appears in Collections:Journal Articles

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