Helena Moreira (INSA, Toulouse)

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Contact : benoit.fauque@espci.fr

3 mai 2012 16:00 » 18:00 — A5 (Holweck)

Highly-Sensitive Strain Gauges Based on Self-Assembled Colloidal Nanoparticles

Gold colloidal nanoparticles are promising building blocks for the elaboration of innovative electronic devices. In this talk, I will present a low cost and innovative highly sensitive strain gauge based on gold nanoparticles. The developed fabrication process is remarkably simple and versatile : metallic nanoparticle assemblies of controlled morphology are deposited on flexible substrates by convective self assembly, and are electrically addressed by stencil lithography [1,2]. The electrical response of the as-prepared nanoparticle-based strain gauges under mechanical deformation has been tested by bending them over the inner and outer surfaces of cylindrical tubes of different diameters. The relative resistance variation ∆R/R0 is exponentially dependent on the deformation e = ∆L/L0, which results from the inter-particle spacing variation, i.e. a variation of the tunnel resistance RT between nanoparticles [3,4]. Compared to metal foil strain gauges, the sensitivity of our nanoparticle strain gauges is 20 to 75 times larger, the range of sensitivity depending on the dimensionality of the assembly. In order to extend the study, I will present some results about strain gauges where major parameters are changed : size of nanoparticles, ligands… An effort of comprehension of the electronic transport in these nanoparticles assemblies has been made by making a correlation between temperature resistance measurements and electro-mechanical response.

[1] C. Farcau, H. Moreira, B. Viallet, J. Grisolia, and L. Ressier, ACS Nano, 2010, 4 (12), 7275–7282.

[2] C. Farcau, S.M. Neralagatta, H. Moreira, B. Viallet, J. Grisolia, D. Ciuculescu-Pradines, L. Ressier, ACS Nano, 2011, 5, 7137-7143.

[3] J. Herrmann, K. Müller, T. Reda, G. R. Baxter, B. Raguse, G. J. J. B. de Groot, R. Chai, M. Roberts and L. Wieczorek, Appl. Phys. Lett. 2007, 91, 183105.

[4] T. Vossmeyer, C. Stolte, M. Ijeh, A. Kornowski and H. Weller, Adv. Funct. Mater. 2008, 18, 1611-1616.

Ce séminaire est proposé par le Laboratoire de physique et d’études des matériaux





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