High-Q Gold and Silicon Nitride Bilayer Nanostrings
arXiv:1207.5790 · doi:10.1063/1.4748977
Abstract
Low-mass, high-Q, silicon nitride nanostrings are at the cutting edge of nanomechanical devices for sensing applications. Here we show that the addition of a chemically functionalizable gold overlayer does not adversely affect the Q of the fundamental out-of-plane mode. Instead the device retains its mechanical responsiveness while gaining sensitivity to molecular bonding. Furthermore, differences in thermal expansion within the bilayer give rise to internal stresses that can be electrically controlled. In particular, an alternating current excites resonant motion of the nanostring. This AC thermoelastic actuation is simple, robust, and provides an integrated approach to sensor actuation.
arXiv comment5 pages, 4 figures + supplementary material
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- On the link between mechanics and thermal properties: mechanothermics