Silica-based QCM substrates were coated with MONs to investigate their performance in sensing various viruses at a constant flow rate of 0.018 ml min -1 . The Hf-BTB-NH2 system was selected as it was the most stable in PBS (Figure ) and minimal signal drift was observed. This QCM sensor had a Hf-BTB-NH2 coating of mean thickness of approximately 100 nm, see Figure . Phage-displaying FTVRDLS, the consensus peptide for Hf-BTB-NH2, was compared with generic 7-mer peptides as a control to assess the extent of non-specific binding.