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Porous Si nanopillar arrays are used as templates for atomic layer deposition of ZnO and TiO2, and thus, ZnO/porous-Si and TiO2/porous-Si nanocomposite nanopillars are fabricated. The diffusion of the precursor molecules into the inside of the porous structure occurs via Knudsen diffusion and is strongly limited by the small pore size. The luminescence of the ZnO/porous-Si nanocomposite nanopillars is also investigated, and the optical emission can be changed and even quenched after a strong plasma treatment. Such nanocomposite nanopillars are interesting for photocatalysis and sensors.
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Wang et al. (2014) studied this question.
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