Application of an electrostatically actuated cantilevered carbon nanotube with an attached mass as a bio-mass sensor |
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| Authors: | Iman Mehdipour Ahmad Erfani-Moghadam Cyrus Mehdipour |
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| Institution: | 1. Department of Mechanical Engineering, Semnan Branch, Islamic Azad University, Semnan, Iran;2. Young Researchers Club and Elites, Semnan Branch, Islamic Azad University, Semnan, Iran;3. Department of Mechanical Engineering, Ferdowsi University of Mashhad, Mashhad, Iran;4. Department of Electrical Engineering, Damghan Branch, Islamic Azad University, Damghan, Iran |
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| Abstract: | In the present paper, another latent capability of SWCNT as a mass sensor is investigated. The relationship between the resonant frequency, dynamic pull-in voltage at the resonance frequency shift, and the attached mass is established by using the nonlocal Euler–Bernoulli beam theory. Using this relationship, a general closed-form nonlinear sensor-equation has been derived for the detection of the mass attached to the SWCNT. The aim of this study and present model is to show the sensitivity of the Cantilevered SWCNT to the values and positions of attached mass. Moreover, the results indicate that by increasing the value of attached mass and considering a single non-local scaling parameter (e0), the values of dynamic pull-in voltage at the resonance frequency shift are decreased. Because of the small scaling parameter (e0), the mass sensitivity of carbon nanotube increases, when the position of the attached mass is in the tip of a Cantilevered SWCNT length. The authority and the accuracy of these formulas are examined with other pull-in sensor equations in literatures. The results demonstrate that the new sensor equation can be applied for CNT-based mass sensors with rational accuracy. |
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| Keywords: | SWCNT Cantilevered carbon nanotube Mass sensor Dynamic pull-in voltage Electrostatic actuation Beam theory Nano-switches |
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