Growth of Single-Crystalline Wurtzite Aluminum Nitride Nanotips with a Self-Selective Apex Angle
| Autor: | Surojit Chattopadhyay, Kuei-Hsien Chen, Chia-Fu Chen, Zon Huang Lan, Shih Chen Shi, Li-Chyong Chen |
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| Rok vydání: | 2005 |
| Předmět: |
inorganic chemicals
Materials science Silicon Aluminium nitride business.industry chemistry.chemical_element Nanotechnology Nitride Condensed Matter Physics Electronic Optical and Magnetic Materials Biomaterials chemistry.chemical_compound chemistry Aluminium Electrochemistry Optoelectronics business Layer (electronics) Nanoscopic scale Pyramid (geometry) Wurtzite crystal structure |
| Zdroj: | Advanced Functional Materials. 15:781-786 |
| ISSN: | 1616-3028 1616-301X |
| DOI: | 10.1002/adfm.200400324 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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