A new type of optical biosensor from DNA wrapped semiconductor graphene ribbons

TL;DR

This paper proposes a novel optical biosensor design using semiconductor graphene ribbons wrapped with DNA, which detects DNA structural transitions via exciton theory, offering a new approach at the subcellular level.

Contribution

It introduces a new biosensor model replacing carbon nanotubes with semiconductor graphene ribbons and analyzes DNA structural transitions using exciton theory.

Findings

DNA B to Z transition detected by the sensor

Theoretical model of exciton behavior in SGRs

Potential for subcellular DNA detection

Abstract

Based on a model of the optical biosensors (Science 311, 508 (2006)) by wrapping a piece of double-stranded DNA around the surface of single-walled carbon nanotubes (SWCNT), we propose a new design model of this sensor, in which the SWCNT is replaced by a semiconductor graphene ribbon (SGR). Using a simple theory of exciton in SGRs, we investigated transition of DNA secondary structure from the native, right-handed B form to the alternate, left-handed Z form. This structural phase transition of DNA is the working principle of this optical biosensor at the sub cellular level from DNA and semiconductor graphene ribbons.