Carbon Nanotube based Mass Nano-Biosensor
Ahmed M. Elseddawy, Walid A. Zein, Adel H. Phillips
Department of Mathematics and Engineering Physics and Faculty of Engineering, Ain-Shams University, Cairo, Egypt
Abstract: Nano-electromechanical system based carbon nanotube is investigated as mass sensor of bio-molecules. The device in this case is modeled as carbon nanotube cantilever coupled to electronic tunneling process through such carbon nanotube. The conductance of this device is studied under the effects of magnetic field and ac-field of wide range of frequencies. Results for the conductance show periodic oscillations, which is due to photon assisted tunneling process. The resonant frequency shift and quality factor are solved numerically with dependence on the dimension of the carbon nanotube cantilever at different values of the mass of the bio-molecule. Results show both these parameters depend strongly on the length and the difference in radii of carbon nanotube. The high value of the quality factor, in the present paper, is impacted to applications of the present device to ultrafast bio-sensors and actuators. The present research can be potentially used for sensing the trace Acetone concentration in human breath, which leads to convenient, accurate and painless breath diagnosis of diabetics.
[Ahmed M. Elseddawy, Walid A. Zein, Adel H. Phillips. Carbon Nanotube based Mass Bio-sensor. J Am Sci 2012;8(10):566-573]. (ISSN: 1545-1003). http://www.jofamericanscience.org. 79
Keywords: Carbon nanotube (CNT),Nano electromechanical system (NEMS), Biosensor, Mass sensor. Full Text 79