Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/14401
Title: Scanning tunneling microscopy study of nanostructures on the 6H-SiC(0001) surface
Authors: CHEN WEI
Keywords: STM, 6H-SiC(0001), reconstructions, oxidation, nanoclusters, nano-template
Issue Date: 3-Dec-2004
Source: CHEN WEI (2004-12-03). Scanning tunneling microscopy study of nanostructures on the 6H-SiC(0001) surface. ScholarBank@NUS Repository.
Abstract: In this thesis, scanning tunneling microscopy (STM) was used to investigate the formation and self-assembly processes of nanostructures on the 6H-SiC(0001) surfaces. We observed dissimilarity between STM filled and empty state images on the 3??3 surface, and suggested that this is due to the substitution of carbon atoms for Si-adatoms. The initial stages in the oxidation of this surface begin with the attachment of oxygen on the dangling bond site of the 3??3 Si cluster, to be followed subsequently by its insertion into the Si-Si backbond. Next, we found that a honeycomb-like, carbon nanomesh with periodically arranged pores of ~2nm can be fabricated on the reconstructed 6H-SiC(0001) surface which has been annealed to 1000A?C. Significantly, monodispersed Co nanoclusters which resist aggregation up to a temperature of 500A?C can be fabricated on this template. Finally, the growth mechanism of boron nitride (BN) thin film on the 6H-SiC substrate grown was studied using the atomic force microscope (AFM).
URI: http://scholarbank.nus.edu.sg/handle/10635/14401
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