We report on a photochemical approach for the deposition of gold into the nanosized pores of an anodized aluminum oxide (AAO) template and thereby form elongated nanoparticles. The photochemical reduction of a gold salt complex is triggered by the presence of seed particles applied on the pore openings, which results in a targeted deposition of the optically activated gold species from solution. The Au nanorods generated inside the AAO template are analyzed by optical extinction spectroscopy and electron microscopy. These investigations allow conclusions concerning the distribution of the particle aspect ratio and at the same time provide a deeper understanding of the diffusion-driven deposition process inside the pores. On the basis of these results, we discuss several deposition parameters and highlight advantages and difficulties of the technique
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