SPI Conductive Double Sided Adhesive Sheets
Applications for XPS and other types of surface analysis
We are often times asked about the use of these sheet products for the
mounting of samples being analyzed in surface analysis systems.
Most of our experience is with the double sided adhesive carbon product so
the following comments will apply to the carbon sheets, for the silver
sheets we just don't have corresponding information.
We, ourselves in our own laboratories, starting in 1977, started using the
SPI double sided conductive carbon sheets for mounting of certain samples,
mainly powders, for XPS. We found that when we compared a blank metal strip
vs. the same metal strip with a square a few mm square into the vacuum of
the system, we hardly could detect any kind of deflection at all in the
vacuum and when we did, it was on the same order of what was seen for the
control sample without adhesive applied. We also found that insertion of a
sample with powder applied produced sometimes a greater deflection. So we
were convinced early on, on that basis, that the SPI Double Sided Conductive
Carbon Sheets could be used for this purpose. We also found that the
product, in sheet form was far more convenient to use, than in die cut disc
form, since a minimum size piece could be cut out from the sheet material
more easily than from the cut disc material.
Since that time, we have found that quite a large population of (especially
XPS) users take advantage of these excellent UHV properties of the SPI
Double Sided Conductive Carbon Sheets for applications in surface analysis,
especially for the mounting of samples for XPS.
We do know that the system does contain a plasticizer, however, the
diffusion rate must be imperceptibly low in order for the material to
exhibit such imperceptible impact on the quality of the vacuum.
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Tuesday December 02, 2008
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