Abstract
In this paper we have designed a biosensor device built from B-N substituted graphene nanoribbon within density functional based tight-binding (DFTB) framework. We have investigated the interaction of the nucleobases adenine (A), Guanine (G), Cytosine (C) and Thymine (T) with device. Our calculation suggests that all the nucleobases have different interaction strength when they interact with device and shows that guanine has stronger interaction with device than other nucleobases. It reveals that the absorption energy shows the hierarchy: G > C > T > A. Our results also demonstrate the transport properties of the device and how the transport properties change due to the absorption of nucleobases on the device.
Highlights
In order to improve the sequencing technologies, the interaction of nucleobases with nanostructure has attracted much attention [1,2,3]
Graphene nanoribbon gives the evidence of having large density of state at the edge near the Fermi level; due to this, it provides a golden opportunity to explore distinctive transport properties of graphene nanoribbons (GNR) and has been investigated by many groups [7]
In order to calculate the stability of device with different nucleobases we have calculated the adsorption energy of each nucleobases on device
Summary
In order to improve the sequencing technologies, the interaction of nucleobases with nanostructure has attracted much attention [1,2,3]. Opportunities for tuning them as a sensor It was already investigated by many groups that substitutional doping of GNR by B or N changes the conducting characteristics and has opened a great possibility for electronic device fabrication [8,9]. Our specific aim is to calculate the absorption strength of these nucleobases placed on device and explore the change on transport properties of B-N doped graphene. This will give the clear idea about the ability of B-N substituted graphene for sensing biomolecules
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