Abstract
Inspired by the dendritic integration and spiking operation of a biological neuron, flexible oxide-based neuromorphic transistors with multiple input gates are fabricated on flexible plastic substrates for pH sensor applications. When such device is operated in a quasi-static dual-gate synergic sensing mode, it shows a high pH sensitivity of ~105 mV/pH. Our results also demonstrate that single-spike dynamic mode can remarkably improve pH sensitivity and reduce response/recover time and power consumption. Moreover, we find that an appropriate negative bias applied on the sensing gate electrode can further enhance the pH sensitivity and reduce the power consumption. Our flexible neuromorphic transistors provide a new-concept sensory platform for biochemical detection with high sensitivity, rapid response and ultralow power consumption.
Highlights
With the recent interest in brain/computer interfaces[1], soft robotics[2], wearable electronics[3] and skin-like sensory systems[4], flexible devices have attracted growing attention
A miniature Ag/AgCl reference electrode immersed into a 5.0 μ L pH buffer solution droplet on the nanogranular SiO2 (n-SiO2) electrolyte film acts as a sensing gate (G1)
The distinctive feature of our device is that sensing gate and all control gates are located at the same plane
Summary
With the recent interest in brain/computer interfaces[1], soft robotics[2], wearable electronics[3] and skin-like sensory systems[4], flexible devices have attracted growing attention. Single-spike dynamic sensing of such flexible neuromorphic transistor was investigated, and pH sensing with ultra-high sensitivity, very quick response/ recover time, and extremely low power consumption were realized. (a) Transfer curves of the IZO-based neuromorphic transistor measured by sweeping the voltage on the control gate (G2) at VDS = 1.5 V.
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