Fig. 4
a ToF-SIMS intensity map on crosssections displaying the distribution of \(\hbox {C}_{17}\) (269.25 m/z) which migrated out of the \(\text{pLOC}_{{17}}\) into the layer of Znpol during ethanol exposure. The images were rescaled to show good contrast. b A selection of ester band normalised ATR-FTIR spectra of Znpol layer after 5 min of ethanol exposure. Red corresponds to a region close to \(\text{pLOC}_{{17}}\) and green corresponds to the top of Znpol where ethanol was introduced. Three spectra (averages of three slabs located at the top, middle and bottom of the cross-section) are shown and shifted for clarity. A small band around 1600 \(\hbox {cm}^{-1}\) is caused by the Technovit embedding resin