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Towards wireless highly sensitive capacitive strain sensors based on gold colloidal nanoparticles.

Abstract

We designed, produced and characterized new capacitive strain gauges based on colloidal gold nanoparticles (NPs). 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 mix 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 gauges. This low-cost equipment paves the way for the development of a whole wireless application set-up

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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, Accepted Manuscript
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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, Accepted Manuscript , DOI: 10.1039/C7NR09685B

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