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Flexible Electromechanical Sensors based on Graphene Composites

Flexible Electromechanical Sensors based on Graphene Composites . S. Littlejohn, A. Nogaret , D. Pantos, S. Crampin University of Bath. +. Graphite/graphene nanoparticles. Chemical functionalization. +. =. Elastomer. Material for flexible electronics. Active composite.

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Flexible Electromechanical Sensors based on Graphene Composites

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  1. Flexible Electromechanical Sensors based on Graphene Composites S. Littlejohn, A. Nogaret, D. Pantos, S. Crampin University of Bath

  2. + Graphite/graphene nanoparticles Chemical functionalization + = Elastomer Material for flexible electronics Active composite

  3. Plastic oscillators Tuned oscillations The composite oscillates spontaneously when biased. The oscillation frequency is tuneable with an external LC circuit up to ~10kHz. The composite continues to oscillate as it is bent to very tight curvature radii (2mm).

  4. Sensitive electromechanical sensors Natural oscillations The natural resonance of the composite increases with increasing strain f/f=75%. The composite codes mechanical strain into oscillation frequency – like mechanoreceptor neurons in the skin. Power Spectral Density of the oscillation under increasing strain

  5. 3 > 2 Mechanoreceptor neurons fire voltage spikes at a rate that increases with strain… like the composite.  pressure, shear stress sensing by active artificial skin. 2 > 1 1 Competingtechnologies:MicromachinedSilicon / GaAs Floating shear stress sensor Pressure sensor Artificial skin

  6. Active flow control / turbulence imaging Sensitive skins for robots Skin drag reduction for aircraft Medical implants / catheters Applications

  7. NDR mechanism Littlejohn et al. Adv. Mat. 23, 2815 (2011)

  8. Summary • The Negative Differential Resistance of composites has been demonstrated in the group. • We have demonstrated flexible electronic oscillators and amplifiers based on graphene/graphite composites. • Sensitive electromechanical properties:Oscillators fire at a rate that increases with stress like mechanoreceptor neurons in the skin. intelligent skins for aircraft, robots, implants… Collaboration sought for the development of conformable active electronics !

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