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南京大学/南洋理工大学/甬江实验室Nat. Mater.:用于高稳健神经形态假体的自修复水凝胶离子电子储存器

  • 2026-03-17 19:28:27
南京大学/南洋理工大学/甬江实验室Nat. Mater.:用于高稳健神经形态假体的自修复水凝胶离子电子储存器

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近日,南京大学万昌锦副教授、施毅院士、薛斌教授、李昀教授和新加坡南洋理工大学陈晓东院士、甬江实验室万青教授合作报道了一种基于水凝胶的离子电子储存器(HIRE),为神经形态假体提供了卓越的物理与功能稳健性。该器件利用水凝胶-电极界面的非线性动力学作为物理储存器预处理时间序列,对物理损伤敏感性极低。基于HIRE的系统实现了95%的语音识别准确率,断裂后重新贴合仅需0.02 s即可恢复功能,在神经康复过程中表现优于生物系统。此外,其pH敏感动力学可在大鼠模型中实现自适应闭环神经刺激控制,验证了其在神经康复和感觉运动功能恢复中的潜力。相关工作以“An iontronic reservoir for highly robust neuromorphic prosthesis”为题发表在《Nature Materials》。

 01背景引言

神经形态假体不仅需要模拟神经结构与功能,还需在动态生理环境中抵御不可预测的故障。尽管自修复电子器件已能恢复类突触功能,但在高阶认知功能应用中仍受局限。传统神经形态系统面临两大瓶颈:一是物理损伤后需复杂算法重新训练才能恢复运行,可靠性不足;二是难以适应生物信号波动,缺乏动态调控能力。自修复材料虽在传感、逻辑运算等领域展现潜力,但尚未实现复杂智能任务的认知级恢复。开发兼具瞬时损伤恢复能力、自适应信号预处理功能与生物相容性的神经形态器件,对推动神经假体从功能替代迈向实际临床应用具有重要意义

 02图文导读

HIRE采用三端平面忆容结构,以聚乙烯亚胺(PEI)与聚丙烯酸(PAA)通过静电相互作用物理交联形成的自修复水凝胶(SHH)为介电层,激光诱导石墨烯(LIG)为电极。示意图显示,纳米尺度的双电层(EDL)动力学是其核心,即使经历切割、拉伸、压缩等机械变形,仍能维持稳定时序动力学。实物图呈现了器件在原始、按压、拉伸、切割贴合、愈合后按压及拉伸六种物理状态下的稳定性。荧光成像证实,愈合过程中PAA与PEI聚合物链相互渗透缠结,室温下愈合9 min后,水凝胶恢复初始应变耐力的77.8±2.8%。T-剥离测试表明,随着愈合时间延长,最大剥离力与剥离强度逐渐提升,趋近于完整样品水平

图 1. 基于自修复水凝胶(SHH)的离子电子储存器结构与自修复性能

电化学阻抗谱显示,输入(IN)-输出(OUT)电极对的阻抗约为IN-地(GND)和GND-OUT的两倍,这种不对称性赋予器件反时针滞后回线的忆容特性。器件对单脉冲表现出短期可塑性,2 s内衰减98.07%,且脉冲幅度与宽度可调控可塑性强度。成对脉冲易化(PPF)测试显示,脉冲间隔影响易化指数,符合生物突触特性。四比特二进制脉冲序列测试中,器件产生16种不同输出状态,t-分布随机邻域嵌入(t-SNE)分析表明,输出状态分离度显著提升,证实其能将输入转化为高维线性可分表征

图 2. HIRE器件的电学特性表征

网络架构通过时分复用在时域建立虚拟互联节点,预处理阶段包括特征提取、基于衰减记忆的掩蔽及电压转换,输出权重通过一步线性回归训练获得。实测输出电压与基于双相指数模型的模拟结果高度吻合。Mackey-Glass时间序列预测测试中,均方根误差仅约0.137。在九项基准任务中,包括语音数字识别、手势识别、抓握力检测、手写数字识别、卵巢结构识别、虹膜分类、新冠检测、心电图诊断及人体动作识别,准确率均超过90%,其中心电图诊断采用3D掩蔽方法准确率达98.31%

图 3. HIRE基储备池计算(RC)网络架构与多任务验证

切割-愈合循环测试显示,器件完整时施加1 V、4.5 s电压脉冲可获得稳定基线响应,完全切割后输出信号中断,重新贴合后仅需 0.02 s 即可恢复至原始水平,信号衰减曲线与完整器件完全一致。记忆容量测试表明,在六种物理状态下,器件在短期记忆、奇偶校验、异或运算三项任务中的表现无统计学显著差异,证实时序处理能力不受物理变形影响。语音识别实验中,器件切割后重新贴合瞬间(~0.02 s)准确率达95%,愈合540 s后准确率维持 90%,全程无需重新训练输出权重。与现有自修复神经形态器件及生物有机体对比,HIRE 的神经形态愈合速度快数个数量级。

图 4. HIRE基RC网络的智能任务恢复与容错性

假体整合外部语音指令与内部生理监测,通过植入的HIRE识别“Run”与“Rest”指令,同时基于肌肉表面pH值(反映疲劳程度)动态调整神经刺激强度。实物图呈现了植入大鼠腿部肌肉附近的HIRE器件,通过印刷电路板(PCB)将识别结果转化为刺激信号作用于坐骨神经,诱导不同角度的腿部运动。pH分类测试中,器件对pH7.4(休息状态L1)、7.2(中度疲劳L2)、7.0(疲劳状态L3)的识别准确率达92.86%。闭环控制实验表明,当pH降至7.2时,系统自动将刺激幅度从5 V降至4 V,pH进一步降至7.0时降至3 V,腿部运动角度从38.2±5.4°逐步降至5.4±3.4°,避免乳酸过度积累;而开环控制则导致pH持续下降,引发潜在酸中毒。

图 5. HIRE基神经形态假体的闭环神经刺激控制

 03总结展望

本研究通过纳米尺度双电层动力学与自修复水凝胶的协同设计,成功构建了兼具高稳健性与自适应能力的离子电子储存器(HIRE)。核心机制在于:一是双电层动力学局限于纳米尺度,最大限度降低物理损伤影响,断裂后通过静电耦合瞬时恢复离子连续性,实现 0.02 s快速功能修复;二是PEI与PAA的静电交联赋予水凝胶高效自修复能力,无需外部刺激;三是pH敏感的离子动力学使其能动态响应生理环境变化,实现闭环调控。未来可从三方面优化:材料层面,通过改性水凝胶提升力学强度与环境稳定性;器件层面,优化电极结构与集成度,降低能量消耗;计算层面,拓展多模态信号处理能力,提升复杂任务适应性。HIRE在神经假体、人机接口、生物混合智能系统等领域具有广阔应用前景,为下一代神经形态工程与生物电子医学提供了紧凑、稳健的解决方案。

文章信息

期刊:Nature Materials

题目:An iontronic reservoir for highly robust neuromorphic prosthesis

作者:Mengjiao Pei, Tian Gao, Li Liu, Wenlong Li, Haotian Long, Yifei Luo, Zhaogang Teng, Hangyuan Cui, Xiang Li, Qinyong Dai, Kailu Shi, Lesheng Qiao, Baocheng Peng, Qianye Xing, Manhua Wen, Mengtao Han, Zhenhua Wan, Yun Li,* Bin Xue,* Yi Cao, Yi Shi,* Qing Wan,* Xiaodong Chen,* Changjin Wan*

原文链接:

https://doi.org/10.1038/s41563-026-02532-7

或点击下文阅读原文

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  1. CONNECT:[ UseTime:0.000620s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000699s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000313s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000266s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000476s ]
  6. SELECT * FROM `set` [ RunTime:0.000233s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000510s ]
  8. SELECT * FROM `article` WHERE `id` = 504243 LIMIT 1 [ RunTime:0.000393s ]
  9. UPDATE `article` SET `lasttime` = 1775409859 WHERE `id` = 504243 [ RunTime:0.003548s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000230s ]
  11. SELECT * FROM `article` WHERE `id` < 504243 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000482s ]
  12. SELECT * FROM `article` WHERE `id` > 504243 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000347s ]
  13. SELECT * FROM `article` WHERE `id` < 504243 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000744s ]
  14. SELECT * FROM `article` WHERE `id` < 504243 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001024s ]
  15. SELECT * FROM `article` WHERE `id` < 504243 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000809s ]
0.079492s