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Issue 35, 2016
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Electrostatically driven drumhead resonators based on freestanding membranes of cross-linked gold nanoparticles

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Abstract

Freestanding, nanometer-thin membranes of alkanedithiol cross-linked gold nanoparticles represent elastic, mechanically robust and electrically conductive materials, which are interesting for the fabrication of novel nano- and microelectromechanical devices. In this work we present the first electrostatically driven drumhead resonators based on such nanoparticle membranes. These circular membranes have a thickness of 33 to 52 nm, a diameter of either 50 μm or 100 μm, and are equally spaced from their back electrode by ∼10 μm. Using an interferometric nanovibration analyzer various vibrational modes with resonance amplitudes of up to several 100 nm could be detected when the membranes are excited by applying AC voltages (<30 V) with drive frequencies of up to 2 MHz. Further, spatial amplitude distributions of different vibrational modes could be imaged. The devices showed fundamental resonance frequencies in the high kHz range and quality factors Q up to ∼2000. Finally, vibrational spectra and observed mode patterns could be well interpreted using the theory for a clamped circular membrane with negligible bending stiffness. Our findings mark an important step towards the integration of freestanding gold nanoparticle composite membranes into electromechanical devices with various applications, such as novel types of pressure or mass sensors.

Graphical abstract: Electrostatically driven drumhead resonators based on freestanding membranes of cross-linked gold nanoparticles

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Supplementary files

Article information


Submitted
30 Mar 2016
Accepted
08 Jul 2016
First published
11 Jul 2016

This article is Open Access

Nanoscale, 2016,8, 15880-15887
Article type
Paper

Electrostatically driven drumhead resonators based on freestanding membranes of cross-linked gold nanoparticles

H. Schlicke, C. J. Schröter and T. Vossmeyer, Nanoscale, 2016, 8, 15880
DOI: 10.1039/C6NR02654K

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