Upon laser-treatment of the pure adenine-CNFA as well as the optimized sensor, a variety of N functional groups is preserved in the N-containing phases of the lower layer. These functional groups are detected in the low-energy region of the FT-IR spectrum at 1064, 1241, and 1390 cm -1 (Figure ). The latter two most likely originate from C-N stretching vibrations, either graphitic or pyrrolic/imidazolic N. The XPS analysis shows a major content of pyrrolic/imidazolic N in the LP-NC films. It has been shown, that pyrrolic N decomposes at temperatures >600-800 °C. The cross-sectional analyses of the sensor indicate that the laser-induced reaction temperatures in the sensor layer are lower, and thus a major part of the pyrrolic/imidazolic N is preserved after laser treatment.