Microscopic Detection Analysis of Single Molecules in MoS₂ Membrane Nanopores.

Abstract

A systematic microscopic analysis of the various resistive effects involved in the electronic detection of single biomolecules in a nanopore of a MoS₂ nanoribbon is presented. The variations of the transverse electronic current along the two-dimensional (2D) membrane due to the translocation of DNA and protein molecules through the pore are obtained by model calculations based on molecular dynamics (MD) and Boltzmann transport formalism, which achieved good agreement with the experimental data. Our analysis points to a self-consistent interaction among ions, charge carriers around the pore rim, and biomolecules. It provides a comprehensive understanding of the effects of the electrolyte concentration, pore size, nanoribbon geometry, and also the doping polarity of the nanoribbon on the electrical sensitivity of the nanopore in detecting biomolecules. These results can be utilized for fine-tuning the design parameters in the fabrication of highly sensitive 2D nanopore biosensors.