An integrated, direct-write temperature shock recording chip

We have successfully demonstrated an on-chip, passive temperature shock recording chip to memorize temperature events in its electrical resistance with ultrahigh sensitivity - 4 orders of sheet resistance drop within 2 minutes of a temperature shock. Compared with the state-of-art technologies, three distinctive advancements have been achieved: (1) the smallest size (400×450μm
²
) of its kind with integrated passive temperature sensor and circuitry; (2) passive temperature sensing based on the heating-induced reduction of silver-ions in a polymer film; and (3) the direct-write integration of the sensor strip onto an IC chip by the electrohydrodynamic printing process. As such, the proposed sensing scheme and results could open up a new class of passive temperature sensing to record heating events with wireless readouts.