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Issue 22, 2018
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Towards wireless highly sensitive capacitive strain sensors based on gold colloidal nanoparticles

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Abstract

We designed, produced and characterized new capacitive strain sensors based on colloidal gold nanoparticles. The active area of these sensors, made up of a 1 mm2 close-packed assembly of gold nanoparticles between interdigitated electrodes, was designed to achieve measurable capacitance (>∼1 pF) and overcome parasitic capacitances. Electro-mechanical experiments revealed that the sensitivity of such capacitive sensors increases in relation to the size of the nanoparticles. In the case of 14 nm gold NPs, such sensors present a relative capacitance variation of −5.2% for a strain of 1.5%, which is more than 5 times higher than that observed for conventional capacitive strain gauges. The existence of two domains (pure capacitive domain and mixed capacitive–resistance domain) as a function of the frequency measurement allows for the adaptation of sensitivity of these capacitive sensors. A simple low-cost circuit based on a microcontroller board was finally developed to detect the capacitance variations of such NP based strain sensors. This low-cost equipment paves the way for the development of an entirely wireless application set-up.

Graphical abstract: Towards wireless highly sensitive capacitive strain sensors based on gold colloidal nanoparticles

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Publication details

The article was received on 28 Dec 2017, accepted on 27 Apr 2018 and first published on 02 May 2018


Article type: Paper
DOI: 10.1039/C7NR09685B
Citation: Nanoscale, 2018,10, 10479-10487
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    Towards wireless highly sensitive capacitive strain sensors based on gold colloidal nanoparticles

    H. Nesser, J. Grisolia, T. Alnasser, B. Viallet and L. Ressier, Nanoscale, 2018, 10, 10479
    DOI: 10.1039/C7NR09685B

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