Thick film pastes features

As the sample was warmed past the melting point of the film (165 K), clear Al(2p) XPS features could be identified in the spectrum consistent with the sublimation of the THF film. Furthermore, the binding energies of the C(ls) and O(ls) peaks shifted uniformly by ca. 0.6 eV toward lower values, an effect attributed by the investigators to the charging of the rather insulating character of the thick THF film, which disappears as the material evaporates. Also noted was a decrease in the C/O integrated peak areas from 4.2, as predicted from the chemical formula of THF, to 3.3, which remained constant up to 470 K. Despite the... 

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