The retention of the agZIF-62 phase is also evident in the Raman spectra of all three samples, which contained key agZIF-62 peaks, such as the C-N bond of the imidazolate ring at 1170 cm -1 observed in the literature (Figure ). Raman spectroscopy was also used in an attempt to analyse the interface, which was done previously with similar composites. However, a high background signal, indicative of fluorescence in the spectra of all samples, led to no peaks being evident below 400 cm -1 (i.e., the range in which changes in zinc bonding environment might be observed).