State of the Art - XPS
Dr C Bloomfield
Looking at the distribution of sales in
Germany, France and the UK. 50 machines have been sold in
the last couple of years; only 15% have been sold in the
UK. The split between Industrial and Academic use is 50%
to 44%. What is the UK missing out on?
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Improved sensitivity-
Improved detection limits and reduced acquisition time
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Smaller spot sizes
- 5µm
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XPS imaging - 3µm
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Applications of XPS µ-CP (Contact Printing):
The process in question was the patterning of PE with PAA.
The process is as follows:
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Oxidise the PE film
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PDMS stamp prepared with
an alkyl amine
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Stamp the surface
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Add PTBA then MeSO3H
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PAA coating
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The technique can be used to accurately define the contacted
area of the PAA defining the sharpness of the edges of the
PAA pads.
Adhesive Coverage on Paper:
Homogeneous coating in theory on the paper, but iXPS shows
a variation in the chemistry of the coating. The CC and
the C-O bonds can be imaged independently showing that the
coating is incomplete and that sections of the paper (several
µm2) are not coated.
Surface Segregation:
Anode surface with low levels of In can
be analysed using XPS. The bulk level is ~0.02wt% as determined
by XPS and GDOES. At the surface this has increased to 1%
and following long-term exposure trials this increases to
4% due to surface segregation.
VB Spectra:
Using the small spot mode, with modern
instruments it is possible to get VB spectra in reasonable
acquisition times. Using a 100mm area of analysis on PCB
it was possible to probe the surface showing PET in surface
features.
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