標題: Growth of single-crystalline wurtzite aluminum nitride nanotips with a self-selective apex angle
作者: Shi, SC
Chen, CF
Chattopadhyay, S
Lan, ZH
Chen, KH
Chen, LC
材料科學與工程學系
Department of Materials Science and Engineering
公開日期: 1-五月-2005
摘要: Single-crystal line, hexagonal aluminum nitride nanotips are fabricated using a vapor-transport and condensation process (VTCP) on silicon substrates with or without a catalyst layer. The resultant tips have very sharp nanoscale apexes (∼ 1 nm), while their bases and lengths are up to hundreds of nanometers wide and several micrometers long, respectively. It has been demonstrated that the thickness of the gold-catalyst layer plays a critical role in controlling the size of the tip; in addition, a catalyst-free growth mode has been observed, which results in lesser control over the nanotip morphology. Nevertheless, a remarkably narrow distribution of the apex angle of the nanotips, regardless of whether or not a catalyst was used in the VTCP, has been obtained. Compared with the commonly observed ridge and pyramid structures, the nanotips produced by VTCP have higher angles (∼ 81°) between the tilted (221) and the basal (001) planes that encase it. A mechanism for this self-selective apex angle in aluminum nitride nanotip growth is proposed.
URI: http://dx.doi.org/10.1002/adfm.200400324
http://hdl.handle.net/11536/13773
ISSN: 1616-301X
DOI: 10.1002/adfm.200400324
期刊: ADVANCED FUNCTIONAL MATERIALS
Volume: 15
Issue: 5
起始頁: 781
結束頁: 786
顯示於類別:期刊論文


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