The supramolecular architecture of the hydrogels was assessed further via scanning electron microscopy (SEM) and transmission electron microscopy (TEM). For SEM measurements, both P1 and P2 metallo-hydrogels were freeze-dried prior to the SEM measurements. The variations in the hydrogels' microstructure morphology can be observed in Fig. . All exhibit a flaky microporous structure. Similar structures have been reported in cases of metal-bearing hydrogels formed with coinage metal salts. The P2 metallo-hydrogels in 10% PBS consistently demonstrate flaky formations throughout the sample (Fig. ), while the aqueous analogues demonstrate lamellae formations (Fig. and). Interestingly, in aqueous solution and at lower peptide concentration, P2 displayed fibrous networks in certain parts along the sample e.g., Fig. . P1 metallo-hydrogels exhibit lamellae formation in aqueous media.