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We studied the dynamical response of a nanomechanical resonator tobiomolecular (e.g. DNA) adsorptions on a resonator's surface by using atheoretical model, which considers the Hamiltonian H such that the potentialenergy consists of elastic bending energy of a resonator and the potentialenergy for biomolecular interactions. It was shown that the resonant frequencyshift of a resonator due to biomolecular adsorption depends on not only themass of adsorbed biomolecules but also the biomolecular interactions.Specifically, for dsDNA adsorption on a resonator's surface, the resonantfrequency shift is also dependent on the ionic strength of a solvent, implyingthe role of molecular interactions on the dynamic behavior of a resonator. Thisindicates that nanomechanical resonators may enable one to quantify thebiomolecular mass, implying the enumeration of biomolecules, as well as gaininsight into intermolecular interactions between adsorbed biomolecules on thesurface.

Dynamical Response of Nanomechanical Resonators to Biomolecular Interactions