Batchwise growth of silica cone patterns via self-assembly of aligned nanowires

Luo, Shudong, Zhou, Weiya, Chu, Weiguo, Shen, Jun, Zhang, Zengxing, Liu, Lifeng, Liu, Dongfang, Xiang, Yanjuan, Ma, Wenjun and Xie, Sishen (2007) Batchwise growth of silica cone patterns via self-assembly of aligned nanowires. Small, 3 3: 444-450. doi:10.1002/smll.200600418

Author Luo, Shudong
Zhou, Weiya
Chu, Weiguo
Shen, Jun
Zhang, Zengxing
Liu, Lifeng
Liu, Dongfang
Xiang, Yanjuan
Ma, Wenjun
Xie, Sishen
Title Batchwise growth of silica cone patterns via self-assembly of aligned nanowires
Journal name Small   Check publisher's open access policy
ISSN 1613-6810
Publication date 2007-03
Sub-type Article (original research)
DOI 10.1002/smll.200600418
Volume 3
Issue 3
Start page 444
End page 450
Total pages 7
Place of publication Weinheim, Germany
Publisher Wiley
Language eng
Formatted abstract
Silica-cone patterns self-assembled from well-aligned nanowires are synthesized using gallium droplets as the catalyst and silicon wafers as the silicon source. The cones form a triangular pattern array radially on almost the whole surface of the molten Ga ball. Detailed field-emission scanning electron microscopy (SEM) analysis shows that the cone-pattern pieces frequently slide off and are detached from the molten Ga ball surface, which leads to the exposure of the catalyst surface and the growth of a new batch of silicon oxide nanowires as well as the cone patterns. The processes of growth and detachment alternate, giving rise to the formation of a volcano-like or a flower-like structure with bulk-quantity pieces of cone patterns piled up around the Ga ball. Consequently, the cone-patterned layer grows batch by batch until the reaction is terminated. Different to the conventional metal-catalyzed growth model, the batch-by-batch growth of the triangular cone patterns proceeds on the molten Ga balls via alternate growth on and detachment from the catalyst surface of the patterns; the Ga droplet can be used continuously and circularly as an effective catalyst for the growth of amorphous SiOx nanowires during the whole growth period. The intriguing batchwise growth phenomena may enrich our understanding of the vapour–liquid–solid (VLS) growth mechanism for the catalyst growth of nanowires or other nanostructures and may offer a different way of self-assembling novel silica nanostructures.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Faculty of Engineering, Architecture and Information Technology Publications
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Created: Wed, 26 Oct 2011, 15:56:34 EST by Viviane Victoria Crosthwaite on behalf of Faculty Of Engineering, Architecture & Info Tech