Liquid Phase Deposition of Silicon Dioxide on the Silica Beads Array as Nanostructured Surface

Abstract

Liquid phase deposition (LPD) is one of a production of oxide film, which is useful due to low reaction temperature and production cost. Previously, there have been many efforts to investigate the LPD on the flat surface in view of thickness, density, and composition of oxide film. The coating of nanomaterials using LPD was recently reported, but the mechanism of LPD on the nanostructured surface has not yet been conducted. In this work, we compared the LPD of silicon dioxide on the flat surface and nanostructured surface which is hexagonally close-packed silica beads array. We demonstrated that the nanostructured topography of surface induced local deposition of silicic acid unlike flat surface, resulting in the interesting shape of silica beads. Further, we proposed the different mechanism of local LPD between flat surface and nanostructured surface.

Anisotropic Silicification of Nanostructured Surfaces by Local Liquid-Phase Deposition

“…During stage 1, the local LPD reaction is dominant at the pinholes, leading to morphological changes in the SBs from spherical to hexagonal. In stage 2, the LPD reaction generally occurs on the surface of the hexagonal hc-SB array, resulting in a flattened surface …”

“…In stage 2, the LPD reaction generally occurs on the surface of the hexagonal hc-SB array, resulting in a flattened surface. 37 Morphogenesis, which can be achieved by the biological selfassembly of organic molecules, is crucial to the creation of highly complicated structures with high surface areas and molecular selectivity, resulting from the presence of pores of various sizes. 21 In addition, the arrangement of SDVs in diatoms can lead to the formation of pores of different sizes and orientations in a single monolithic hierarchical structure (Figure 3a).…”