Mass Transport Determined Silica Nanowires Growth on Spherical Photonic Crystals with Nanostructure-Enabled Functionalities

Juan Wang, Eiko Y. Westerbeek, Albert van den Berg, Loes I. Segerink, Lingling Shui, Jan C.T. Eijkel

Research output: Contribution to journalArticleAcademicpeer-review

4 Citations (Scopus)

Abstract

A robust and facile method has been developed to obtain directional growth of silica nanowires (SiO(2)NWs) by regulating mass transport of silicon monoxide (SiO) vapor. SiO(2)NWs are grown by vapor-liquid-solid (VLS) process on a surface of gold-covered spherical photonic crystals (SPCs) annealed at high temperature in an inert gas atmosphere in the vicinity of a SiO source. The SPCs are prepared from droplet confined colloidal self-assembly. SiO2NW morphology is governed by diffusion-reaction process of SiO vapor, whereby directional growth of SiO(2)NWs toward the low SiO concentration is obtained at locations with a high SiO concentration gradient, while random growth is observed at locations with a low SiO concentration gradient. Growth of NWs parallel to the supporting substrate surface is of great importance for various applications, and this is the first demonstration of surface-parallel growth by controlling mass transport. This controllable NW morphology enables production of SPCs covered with a large number of NWs, showing multilevel micro-nano feature and high specific surface area for potential applications in superwetting surfaces, oil/water separation, microreactors, and scaffolds. In addition, the controllable photonic stop band properties of this hybrid structure of SPCs enable the potential applications in photocatalysis, sensing, and light harvesting.
Original languageEnglish
Article number2001026
Number of pages11
JournalSmall
Volume16
Issue number24
DOIs
Publication statusPublished - Jun 2020

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