A sensor configured to sense an external event including: a first component having a first impedance that changes when the external event occurs and being connected between a reference voltage node and an output node wherein the output node is configured to provide, when the external event occurs, a feedback signal to the first component that further changes the first impedance and wherein the first component is a field effect transistor comprising: a gate formed from a conductive core of a nanowire and connected to the output node; a gate dielectric formed from an insulating shell of the nanowire; a source/drain electrode connected to the output node; a source/drain electrode connected to the reference node; and a channel extending between the source/drain electrodes.