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Proceedings 2017, 1(4), 301; doi:10.3390/proceedings1040301

Electrostatically Actuated Membranes of Cross-Linked Gold Nanoparticles: Novel Concepts for Electromechanical Gas Sensors

Institute of Physical Chemistry, University of Hamburg, Grindelallee 117, 20146 Hamburg, Germany
Presented at the Eurosensors 2017 Conference, Paris, France, 3–6 September 2017.
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Published: 29 August 2017
(This article belongs to the Proceedings of Eurosensors 2017)
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Abstract

We report the preparation of freestanding membranes of cross-linked gold nanoparticles (GNPs) and demonstrate their application as electromechanical sensors for volatile organic compounds (VOCs). First, we show that the fundamental vibrational mode frequency of electrostatically excited GNP-membranes shifts significantly when exposing them to solvent vapors. We attribute this effect mainly to the reduction of the membranes’ pre-stress. Second, the relief in pre-stress upon analyte sorption can also be detected via quasi-static actuation of the membranes. In this case, the increase of the deflection amplitudes at constant bias voltages can be measured as the sensor signal and correlated to the analyte’s concentration. Additionally, we propose a facile route to the fabrication of such hybrid MEMS/NEMS sensors using layer-by-layer spin-coating and contact printing.
Keywords: gold; nanoparticle; membrane; electrostatic; actuator; resonator; sensor; gas sensor; MEMS; NEMS gold; nanoparticle; membrane; electrostatic; actuator; resonator; sensor; gas sensor; MEMS; NEMS
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Schlicke, H.; Bittinger, S.C.; Behrens, M.; Yesilmen, M.; Hartmann, H.; Schröter, C.J.; Dahl, G.T.; Vossmeyer, T. Electrostatically Actuated Membranes of Cross-Linked Gold Nanoparticles: Novel Concepts for Electromechanical Gas Sensors. Proceedings 2017, 1, 301.

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