Speaker
Description
The electrochemical deposition and growth of nanostructured platinum films was investigated in operando with Grazing Incidence Small Angle X-ray Scattering (GISAXS) - a non-destructive surface-sensitive technique for structure determination in the nm-regime. The deposition of the films was templated using hexagonal ($H_1$) lyotropic liquid crystalline phases of non-ionic surfactants, a ternary mixture of aqueous 0.2 M $H_2PtCl_6$ and $C_{16}EO_8$ (50:50 wt.%).
Previous studies$^{1,2}$ showed that the resulting $H_1$-e platinum films contain regular hexagonal arrays of cylindrical pores separated by platinum walls with a centre to centre distance of 5-6 nm. These films exhibit very high surface areas in the order of up to 91 m$^2$/g. In the present study, the cylindrical pores are preferentially aligned perpendicular to the electrode surface. The high surface area of the mesoporous films and the ability to control pore structure and orientation enable their successful application in fields such as catalysis, analysis separation technology, optical devices, and biomedical science.
The application of GISAXS in combination with the brilliant synchrotron radiation source at the ELETTRA-Sincrotrone Trieste enables in operando monitoring of the $H_1$-e deposited film regarding nanostructure and orientation of the mesopores. Time-resolved characterization of the structure evolution gives new insights into the kinetics of templated electrodeposition.
(1) Bartlett, P. N.; Gollas, B.; Guerin, S.; Marwan, J. The Preparation and Characterisation of H1-e Palladium Films with a Regular Hexagonal Nanostructure Formed by Electrochemical Deposition from Lyotropic Liquid Crystalline Phases. Phys. Chem. Chem. Phys. 2002, 4 (15), 3835–3842. https://doi.org/10.1039/b201845d.
(2) Attard, G. S.; Bartlett, P. N.; Coleman, N. R. B.; Elliott, J. M.; Owen, J. R.; Wang, J. H. Mesoporous Platinum Films from Lyotropic Liquid Crystalline Phases. Science (80-. ). 1997, 278 (5339), 838–840. https://doi.org/10.1126/science.278.5339.838.
| Speaker Country | Austria |
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