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

Research output: Contribution to journalArticle

91 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)781-786
Number of pages6
JournalAdvanced Functional Materials
Volume15
Issue number5
DOIs
Publication statusPublished - 2005 May 1

All Science Journal Classification (ASJC) codes

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

Fingerprint Dive into the research topics of 'Growth of single-crystalline wurtzite aluminum nitride nanotips with a self-selective apex angle'. Together they form a unique fingerprint.

  • Cite this