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“Sticky”
Dendrons
Novel organic thin films and nanostructures
on a variety of substrate surfaces,
such as Si/SiO2, Si/Si–H,
Au, and glass, are being prepared
using novel dendron adsorbates that
contain many surface-active groups
at the periphery and a functional
group at the focal point of the
dendron. The aim is to develop a
method for the precise control of
the spacing between functional groups
on the film surface. The results
are relevant to the performance
of chemical or biological sensors,
and the fabrication of (single)
molecule devices.
Single
Molecule AFM Tips
We are developing methods for the
modification of the surface of atomic
force microscopy (AFM) tips. At
the first level, silicon AFM tips
are coated with a thin layer of
organic molecules, e.g. oligo(ethylene
glycol)s, to resist non-specific
interaction/adsorption. At the second
level, a few and even one functional
molecule is anchored at the apex
of an AFM tip to form single molecule
AFM tips. Such modified AFM tips
might become powerful tools for
AFM imaging and study of biological
and materials samples at molecular
level.
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Stereochemical
effects in supramolecular self-assembly
at surfaces: 1-D versus 2-D
enantiomorphic ordering for
PVBA and PEBA on Ag(111),
J. Am. Chem. Soc. 2002, 124,
7991-8000.
Nanometer-sized
and tripod-shaped oligophenylenes
end-capped with triallylsilyl
groups, J. Org. Chem.
2002, 67, 5279-5283.
The
first organosiloxane thin films
derived from SiCl3-terminated
dendrons. thickness-dependent
nano- and mesoscopic structures
of the films deposited on mica
by spin-coating, Langmuir,
2002, 18, 7728-7739.
Formation
of robust mesoscopic ring structures
by self-assembly of SiCl3-terminated
dendrimers, Chem. Commun.,
2001, 1442-1443.
Wettabilities
of organosiloxane thin films
derived from SiCl3-terminated
carbosilane dendrons on mica,
Langmuir, in press. |
