Top-down silicon microcantilever with coupled bottom-up silicon nanowire for enhanced mass resolution

Nanotechnology
Gabriel Vidal-ÁlvarezOded Gottlieb

Abstract

A stepped cantilever composed of a bottom-up silicon nanowire coupled to a top-down silicon microcantilever electrostatically actuated and with capacitive or optical readout is fabricated and analyzed, both theoretically and experimentally, for mass sensing applications. The mass sensitivity at the nanowire free end and the frequency resolution considering thermomechanical noise are computed for different nanowire dimensions. The results obtained show that the coupled structure presents a very good mass sensitivity thanks to the nanowire, where the mass depositions take place, while also presenting a very good frequency resolution due to the microcantilever, where the transduction is carried out. A two-fold improvement in mass sensitivity with respect to that of the microcantilever standalone is experimentally demonstrated, and at least an order-of-magnitude improvement is theoretically predicted, only changing the nanowire length. Very close frequency resolutions are experimentally measured and theoretically predicted for a standalone microcantilever and for a microcantilever-nanowire coupled system. Thus, an improvement in mass sensing resolution of the microcantilever-nanowire stepped cantilever is demonstrated with respect ...Continue Reading

References

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Citations

Apr 17, 2019·Nanotechnology·F R Braakman, M Poggio
Aug 23, 2016·Beilstein Journal of Nanotechnology·Julia KörnerThomas Mühl
Aug 23, 2020·Sensors·Rafel Perello-RoigJaume Segura
Dec 17, 2017·Optics Express·Jesper HåkanssonDries Van Thourhout
Mar 9, 2017·Nanotechnology·Jubayer JalilYong Ruan
Jul 22, 2021·Nano Letters·Juan MolinaMontserrat Calleja

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