Growth and electronic properties of Au nanoclusters on thin-film Al2O3/NiAl(100) studied by scanning tunnelling microscopy and photoelectron spectroscopy with synchrotron radiation

The adsorption of the organometallic compounds bis(hexafluoroacetylacetonato)zinc(II) (Zn(hfac)2) and bis(hexafluoroacetylacetonato)nickel(II) (Ni(hfac)2) on the surface of Si(111)-7×7 were studied by a combination of scanning tunnelling microscopy (STM) and X-ray photoelectron spectroscopy (XPS). These compounds are analogues of the compound bis(hexafluoroacetylacetonato)copper(II), which is an important precursor for the chemical vapour deposition of copper that we have previously studied. Both XPS and STM results indicate that the Zn(hfac)2 is adsorbed intact on the surface, and remains intact on the surface at temperatures up to 300 K. The XPS shows a transition from a physisorbed state to a chemisorbed state at temperatures between 160 and 300 K. At higher temperatures Zn(hfac)2 decomposed to form Zn and fluorocarbon fragments. The metal component diffused into the substrate. The Ni(hfac)2 complex could not be successfully adsorbed on the Si surface: it was shown that this was due to decomposition of the molecule in the vapour phase, probably due to the higher temperatures needed to evaporate this relatively involatile compound.Key words: scanning tunnelling microscopy, chemical vapour deposition, zinc, copper.

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Scanning tunnelling microscopy investigations of organic thin film topography

Thin Solid Films ◽

10.1016/0040-6090(90)90295-o ◽

1990 ◽

Vol 188 (2) ◽

pp. 329-333 ◽

Cited By ~ 4

Author(s):

A.M. Troyanovskij ◽

M. Hietschold ◽

M.S. Khaikin ◽

I. Androsch ◽

W. Vollmann ◽

...

Keyword(s):

Thin Film ◽

Scanning Tunnelling Microscopy ◽

Organic Thin Film ◽

Scanning Tunnelling ◽

Tunnelling Microscopy

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Adsorption and reaction of sub-monolayer films of an ionic liquid on Cu(111)

Chemical Communications ◽

10.1039/c4cc03203a ◽

2014 ◽

Vol 50 (62) ◽

pp. 8601-8604 ◽

Cited By ~ 31

Author(s):

Benedikt Uhl ◽

Florian Buchner ◽

Stephan Gabler ◽

Maral Bozorgchenani ◽

R. Jürgen Behm

Keyword(s):

Ionic Liquid ◽

Photoelectron Spectroscopy ◽

Ultrahigh Vacuum ◽

Scanning Tunnelling Microscopy ◽

Monolayer Films ◽

X Ray ◽

Scanning Tunnelling ◽

Tunnelling Microscopy ◽

Reactive Interaction

The reactive interaction of the ionic liquid 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide [BMP][TFSA] with Cu(111) was investigated by scanning tunnelling microscopy (STM) and X-ray photoelectron spectroscopy (XPS) under ultrahigh vacuum (UHV) conditions.

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Influence of Structural Defects on the Electronic Properties of Carbon Nanotubes Examined by Scanning Tunnelling Microscopy

MRS Proceedings ◽

10.1557/proc-1258-r05-21 ◽

2010 ◽

Vol 1258 ◽

Author(s):

Cristina E. Giusca ◽

Ravi Silva

Keyword(s):

Carbon Nanotubes ◽

Electronic Properties ◽

Scanning Tunnelling Microscopy ◽

Structural Defects ◽

Single Walled Carbon Nanotube ◽

Scanning Tunnelling ◽

Tunnelling Microscopy ◽

Straight Segments ◽

Nanotube Growth ◽

Functional Components

AbstractThe electronic properties of carbon nanotubes are quite often drastically affected by the presence of defects that can develop during nanotube growth, processing or characterization too. Some of these defects such as pentagon-heptagon rings, substitutional impurities, vacancies and dislocations are of topological nature, and can sometimes create on-tube intramolecular junctions, as found by previous scanning tunnelling microscopy studies.Our recent STM experiments reveal for the first time a much more complicated junction structure, a hybrid single-walled carbon nanotube consisting of a distinct coiled structure located between two straight segments, each of different helicity. We characterise the hybrid junction at the atomic level and describe its electronic behaviour that has important implications in the practical design of functional components for nanoelectronic applications.

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