The total set of IR spectra is shown in Figure . The integrated CH area for each spectrum is depicted in Figure . Starting with the adsorption of TDMAH, we observe negative bands (blue, adsorption) at 2872, 2856, 2820, 2771, 1239 and 948 cm -1 . Additionally, less intense features appear at 1140 and 1060 cm -1 , along with a broad band between 1410 and 1510 cm -1 .