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Silicon carbide nanotube tips: Promising materials for atomic force microscopy and/or scanning tunneling microscopy

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4 Author(s)
Mavrandonakis, Andreas ; Department of Chemistry, University of Crete, P.O. Box 2208, Iraklion 71003, Greece ; Froudakis, George E. ; Andriotis, Antonis ; Menon, Madhu

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Using ab initio techniques we examine the structural properties and energetics of novel nanotip and nanocone materials based on silicon carbide nanotubes. The effect of various structural and topological defects on the highest occupied molecular orbital (HOMO)–lowest unoccupied molecular orbital (LUMO) gap and the stability of these tips are investigated. The HOMO-LUMO gaps range from zero to 2.0 eV due to the defects, providing possible applications in band gap engineering. These tips which combine the elastic and mechanical properties of nanotubes with the stiffness of silicon carbide materials can find applications as atomic force microscopy and scanning tunneling microscopy probes.

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Applied Physics Letters  (Volume:89 ,  Issue: 12 )