In order to keep
nanomaterials under dispersion and inject them into a living organism,
their surface should be modified to have a certain functionality.
Thus, the ligand exchange reaction on the nanomaterial surface and
stability is one of the major concerns in nanomaterial characterization.
Assessment of ligand binding on nanomaterial surface
Mercaptopropionic acid (MPA)
is coated on a quantum dot surface. Micropattern from drop-cast on ITO
surface and drying is imaged by XPS. Each core level shows areal
distribution with a certain correlation each other. If two atoms are
correlated together, they are probably bound each other. This approach is
planned to proceed an inter-laboratory comparison for standardization of
ligand binding assessment (in
Quantification of Surface
The quantification of organic substance
in any application is prime important. To qualify an nanomaterial in
practical use, one has to know the actual amount of surface functional
groups. Before doing the actual quantification, the density of an
organic thin film is measured by XPS. Through the electron attenuation rule
and standard reference such as graphite, vacuum-deposited organic thin film
could be quantified. (in
(313동) B-16, Tel.
217 과학기술연합대학원대학교 나노계측과학과
File last modified: Mar. 28 2019