Effect of gas flow on electronic transport in a DNA-decorated carbon nanotube

TL;DR

This paper investigates how gas flow influences electronic transport in a DNA-decorated carbon nanotube sensor, combining experimental data with quantum transport calculations to explore sensor sensitivity and DNA detection potential.

Contribution

It presents a theoretical model using nonequilibrium Green's functions to analyze gas flow effects on electronic transport in DNA-functionalized nanotubes, linking experimental and analytical approaches.

Findings

Correlation function pattern indicates sensor sensitivity and selectivity.

Quantum transport calculations match experimental current data.

Gas flow impacts electronic transport properties significantly.

Abstract

We calculate the two-time current correlation function using the experimental data of the current-time characteristics of the Gas-DNA-decorated carbon nanotube field effect transistor. The pattern of the correlation function is a measure of the sensitivity and selectivity of the sensors and suggest that these gas flow sensors may also be used as DNA sequence detectors. The system is modelled by a one-dimensional tight-binding Hamiltonian and we present analytical calculations of quantum electronic transport for the system using the time-dependent nonequilibrium Green's function formalism and the adiabatic expansion. The zeroth and first order contributions to the current $I^{(0)}(\bar{t})$ and $I^{(1)}(\bar{t})$ are calculated, where $I^{(0)} (\bar{t})$ is the Landauer formula. The formula for the time-dependent current is then used to compare the theoretical results with the experiment.