We synthesize a flexible yet electronically active composite that mimics mechanoreceptor neurons in the human skin, generating voltage oscillations whose frequency increases with pressure. By encoding pressure into frequency, the sensor achieves a high pressure sensitivity (<10Pa). The ability to sense pressure and to amplify signals arises from the robust negative differential resistance of functionalized graphitic flakes in silicone.
Littlejohn, S., Nogaret, A., Prentice, G., & Pantos, D. (2013). Pressure sensing and electronic amplification with functionalized graphite silicone composite. Advanced Functional Materials, 23(43), 5398-5402. https://doi.org/10.1002/adfm.201300519