Binding performance of peptides to synthesised Hf-BTB-NH2 nanosheets. QCM studies provided strong evidence of highly selective binding to the phage. However, investigations of individual peptides were unsuccessful owing to the relatively high flow rates required for the set-up. To gain a better understanding of the recognition capabilities of the nanosheets for isolated peptides not attached to phage, zeta potential and surface plasmon resonance (SPR) measurements were undertaken to determine the dissociation constant (Kd) and equilibrium dissociation constant (KD) for the on-target and offtarget peptides to Hf-BTB-NH2.