Growth of single-crystalline wurtzite aluminum nitride nanotips with a self-selective apex angle

Shih Chen Shi, Chia Fu Chen, Surojit Chattopadhyay, Zon Huang Lan, Kuei Hsien Chen, Li Chyong Chen

研究成果: Article同行評審

92 引文 斯高帕斯(Scopus)

摘要

Single-crystalline, 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.

原文English
頁(從 - 到)781-786
頁數6
期刊Advanced Functional Materials
15
發行號5
DOIs
出版狀態Published - 2005 五月 1

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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