Electronic Transport through DNA Nucleotides in Atomically Thin Phosphorene Electrodes for Rapid DNA Sequencing

Area of Science:

• Nanotechnology
• Materials Science
• Genomics

Background:

• Personalized medicine relies on rapid, cost-effective DNA sequencing.
• Nanotechnology offers advanced DNA sequencing methods using nanopores and nanogaps.

Purpose of the Study:

• To explore the application of a black phosphorene-based nanogap device for DNA sequencing.
• To computationally assess the feasibility of differentiating DNA nucleotides using this device.

Main Methods:

• Density-functional theory (DFT) combined with the non-equilibrium Green's function (NEGF) approach.
• Calculation of transverse transmission and current-voltage (I-V) characteristics for all four DNA nucleotides.
• Simulation of nucleotide behavior under varying applied bias voltages.

Main Results:

• Distinct transverse transmission and I-V characteristics were computed for deoxyadenosine monophosphate, deoxyguanosine monophosphate, deoxythymidine monophosphate, and deoxycytidine monophosphate.
• The study identified specific bias voltages (0.2 V, 1.4 V, and 1.6 V) at which individual differentiation of all four nucleotides is theoretically possible.
• The phosphorene nanogap device shows potential for distinguishing between the four DNA bases.

Conclusions:

• Black phosphorene nanogap devices offer a promising avenue for DNA sequencing.
• The proposed method could enable rapid and accurate DNA base identification, aiding in disease diagnosis.
• This research provides a theoretical foundation for experimental development of phosphorene-based nanodevices for genomic applications.