Frequency analysis of hexagonal microbeam with 2D nanofiber mat

Gangele, Aparna and Akarapu, Ashok and Sharma, Chandra Shekhar and Pal, Prem and Pandey, Ashok Kumar (2019) Frequency analysis of hexagonal microbeam with 2D nanofiber mat. Materials Research Express. ISSN 2053-1591

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Abstract

An excellent properties of graphene (Gr) is partially credited to its two-dimensional (2D) molecular structure which resembles like interconnected unit of hexagonal carbon atoms ring. Therefore, to capture some of the properties of graphene, we analyze the influence of hexagonal shape of microcantilever beam without and with hexagonal hole of varing side length. To carry out the analysis, we first fabricate the hexagonal structure and perform measurement using laser vibrometer. Based on the measurement, we found that frequency of microcantilever beam with hexagonal shape decreases with increase in hole size. However, we found that the presence of hexagonal holes make the beam flexible by two order of magnitude more than that of a conventional beam without holes. To undo the effect of hexagonal holes on microbeam frequency, we cover the microbeam with an electrospun cellulose acetate nanofiber mat (CAF). Based on the measurements, we found that the frequency can be increased more than that of a solid rectangular microbeam. Finally, we present finite element based methodology to model microbeam and nanofiber mat. After validating the model, we carry out the influence of boundary condition, thickness and concentration of nanofiber mat on microbeam frequency. Thus, based on the understanding developed in this work, this hierarchical structure of microcantilever beam with electrosun nanofibers can be used as a best candidate for utilizing it for the development of flexible sensors based on MEMS devices.

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