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Atomic layer deposition of ZnO on ultralow-density nanoporous silica aerogel monoliths

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10 Author(s)
Kucheyev, S.O. ; Lawrence Livermore National Laboratory, Livermore, California 94550 ; Biener, J. ; Wang, Y.M. ; Baumann, T.F.
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We report on atomic layer deposition of an ∼2-nm-thick ZnO layer on the inner surface of ultralow-density (∼0.5% of the full density) nanoporous silica aerogel monoliths with an extremely large effective aspect ratio of ∼105 (defined as the ratio of the monolith thickness to the average pore size). The resultant monoliths are formed by amorphous-SiO2 core/wurtzite-ZnO shell nanoparticles which are randomly oriented and interconnected into an open-cell network with an apparent density of ∼3% and a surface area of ∼100 m2 g-1. Secondary ion mass spectrometry and high-resolution transmission electron microscopy imaging reveal excellent uniformity and crystallinity of ZnO coating. Oxygen K-edge and Zn L3-edge soft x-ray absorption near-edge structure spectroscopy shows broadened O p- as well as Zn s- and d-projected densities of states in the conduction band.

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Applied Physics Letters  (Volume:86 ,  Issue: 8 )