Bionic Tactile‐Gustatory Receptor for Object Identification Based on All‐Polymer Electrochemical Transistor

Abstract

Human sensory receptors enable the real world to be perceived effortlessly. Hence, massive efforts have been devoted to the development of bionic receptors capable of identifying objects. Unfortunately, most of the existing devices are limited to single sensory emulation and are established on solid-state electronic technologies, which are incompatible with the biological reactions occurring in electrolyte media. Here, an iontronic tactile-gustatory receptor using an all-polymer electrochemical transistor (AECT) is presented. The sensor is biocompatible with the operation voltage of 0.1 V, which is 1 to 2 orders lower than those of reported values. By this study, one receptor is able to accurately recognize various objects perceived by the human tactile and gustatory system without complex circuitry. Additionally, to promote its further application, flexible AECT arrays with channel length of 2 μm and density of 104 167 transistors cm −2 (yield of 97%) are fabricated, 1 to 5 orders higher than those of related works. Finally, a flexible integrated network for electrocardiogram recording is successfully constructed. This study moves a step forward toward state-of-the-art bionic sensors.

有机电化学类脑仿生电子器件研究进展

“…然而, 目前用于物体识别的技术存在一些限制, 如高 操作电压、复杂的外围电路, 以及对电子传输的过度 依赖. 这与生物体内神经递质通过离子运输的方式相 互不兼容 [51] , 其中大多数集中于模拟体感和视觉感觉 系统 [56,125] . 以下分别介绍了演示传感功能和神经信号 处理的人工感觉系统.…”

“…分析物的稳定、精确检测 [126] . 基于以上优势, 柔性 OECTs传感器被广泛应用于检测压力、光和温度, 有 望实时监测触觉、血压、体温等生物指标 [49,51,52,127,128] . 图 7 (a) 6 × 6压力传感器阵列原理图.…”

“…(b) 压力传感器接触调制离子掺杂机制示意图 [128] . (c) 人类感觉受体和全聚合物电化学 晶体管中离子传输示意图以及柔性高密度器件阵列实物图 [51] . (d) 一种基于OECTs的化学感觉神经元突触 [49] .…”

“…(b) Schematic illustration of the contact modulated ionic doping mechanism for pressure sensor[128]. (c) Illustration of the human sensory receptor and the ions transport in all-polymer electrochemical transistor, and photographs of flexible transistor arrays attached to a human finger and paper[51]. (d) OECTs-based synapse of artificial chemosensory neuronal synapse[49].…”

有机电化学晶体管及其在生物电子学领域的应用进展

“…图 15 基于OECT技术的便携式免疫传感系统和IgG传感器的栅极修饰过程 [87] (网络版彩图) 器件中的仿生能力, 可用作仿生突触和神经元 [91] , 或 者仿生感知系统 [92] , 亦或是模拟神经网络计算 [93] . 本 章节重点介绍了OECT在交互式神经形态器件方面的 应用进展.…”