DNA Bases as Molecular Electronic Devices

Randhawa, D.K.K. and Bharadwaj, L.M. and Kaur, Inderpreet and Singh, M.L. (2011) DNA Bases as Molecular Electronic Devices. International Journal of Computer Applications, 19 (2). pp. 39-43. ISSN 0975 – 8887

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Abstract

The current voltage characteristics have been obtained for the four DNA bases Adenine, Thymine, Guanine and Cytosine by non-equilibrium Green‟s function combined with density functional theory. The pattern of current flow for an applied voltage sweep of 0-5 V is plotted. The phenomenon of tunneling is exhibited in the characteristics of molecules. The DNA base cytosine displays a typical surge of current in the voltage sweep section of 0.4V-0.6V, indicating single electron effects. The effect of gate voltage on the current-voltage characteristics of cytosine was studied in the gated two-probe setup. The typical section of characteristics of cytosine was re-drawn by varying the gate potential. The application of gate bias exhibits excellent ON/OFF switching for combinations of the two applied voltages- source voltage and gate voltage. Repetitive peaks are also observed in current when gate voltage is varied, fixing source potential. In this paper the cytosine molecule is proposed as a switch, AND gate and OR gate in this paper that can be used in DNA based molecular electronic devices.

Item Type: Article
Uncontrolled Keywords: DNA bases, tunneling, single electron effects, molecular electronic devices.
Subjects: CSIO > Medical Instrumentation
Depositing User: Ms. J Shrivastav
Date Deposited: 21 Apr 2012 23:31
Last Modified: 21 Apr 2012 23:31
URI: http://csioir.csio.res.in/id/eprint/296

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