| Prospects of ordered carbon nanotube arrays in sensorics are studied basing on molecular dynamics and finite element method simulations. Mechanical and acoustic properties of such arrays are calculated. Array elastic modules and density dependences on oxygen adsorption value are presented. Mechanical instability of square lattice of nanotubes with respect to the transition to triangular one was demonstrated. Using of carbon nanotube arrays as sensing elements of surface acoustic wave based sensors is shown to increase the sensitivity of such sensors up to dozen and more times with respect to usually obtained values for the acoustic wave frequency range 0,1 - 1,0 GHz. Vibration modes of carbon nanotube arrays are calculated in continual approximation on the basis of LS-DYNA package depending on nanotube lengths and diameters distribution in array. Vibration spectrum of arrays exhibits zone character inherent to sonic crystals. Such type of acoustic excitations makes it possible to generate both regular and chaotic motion of carbon nanotube arrays under the external forces. |
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