Journal of Vibration and Sound

Journal of Vibration and Sound

Design and exact analysis of resonant nanosensors based on carbon nanotubes for gas detection

Document Type : research article

Authors
Reza Hosseini-Ara 1
Morteza Rahmati Dehkordi 2
1 Department of Mechanical Engineering, Payame Noor University, PO BOX 19395-3697 Tehran, Iran
2 Department of Mechanical Engineering, Islamic Azad University, Khomeini-shahr Branch, Isfahan, Iran
Abstract
The objective of this research is to design and mechanically analyze a precise resonant nanosensor using carbon nanotubes for the identification of surrounding gases. In most previous studies, for simplicity, beam models have been used in the analysis of carbon nanotubes. However, such models, considering the thin and shell-like geometry of nanotubes, cannot provide high accuracy, thereby questioning the precision of the sensor. In this research, to enhance the accuracy of the nanosensor, a nonlocal cylindrical Donnell shell model was employed, which is hollow and doubly clamped end condition, made of carbon nanotubes. Additionally, to improve computational accuracy, nonlocal effects, rotary inertia, and surface stresses at the nano-scale were considered, whereas they were ignored in previous studies. Furthermore, using the method of variable separation and in a purely analytical manner, the closed-form and precise solution of the governing equations for the vibrations of the nanosensor was obtained based on Donnell’s cylindrical shell equations. This approach aims to achieve higher accuracy and innovation compared to previous works, which were entirely numerical. Subsequently, by calculating the change in the resonant frequency of the nanosensor in contact with surrounding gases and determining the range of the resonant frequency of the nanosensor, the identification of adjacent gases was performed. Finally, to validate the obtained results, the findings for the sample gas Krypton were compared with other references, indicating the high accuracy of the proposed model.
Keywords
Resonant nanosensor
gas detection
carbon nanotubes
nonlocal effects
surface tensions
Subjects
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