CN112802963A - 一种人工嗅觉纤维及其制备方法 - Google Patents
一种人工嗅觉纤维及其制备方法 Download PDFInfo
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- CN112802963A CN112802963A CN202110002218.0A CN202110002218A CN112802963A CN 112802963 A CN112802963 A CN 112802963A CN 202110002218 A CN202110002218 A CN 202110002218A CN 112802963 A CN112802963 A CN 112802963A
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Abstract
本发明属于半导体器件与集成系统技术领域,公开了一种人工嗅觉纤维及其制备方法,该人工嗅觉纤维包括至少一个嗅觉感受单元、以及通过导电纤维与嗅觉感受单元相连的忆阻功能单元;以量子点材料作为嗅觉受体包覆柔性纤维制备嗅觉感受单元;将导电纳米材料修饰于柔性纤维上制备导电纤维;采用忆阻功能材料修饰柔性纤维制备忆阻功能单元;忆阻功能单元用于作为人工突触完成嗅觉信息的传导和存储。本发明通过对人工嗅觉纤维的结构、组成等进行改进,设计制备集成气体传感器、导电纤维和忆阻器功能的人工嗅觉纤维,能够分别模拟人工嗅觉感受器、嗅觉传导纤维和人工突触实现嗅觉信息的感知、传输和存储功能。
Description
技术领域
本发明属于半导体器件与集成系统技术领域,更具体地,涉及一种人工嗅觉纤维及其制备方法。
背景技术
伴随着人工智能和物联网的不断发展,信息量暴增的大数据时代对信息获取、存储和处理的需求提出了新的挑战。一方面,随着集成电路发展过程中集成度的不断提升,基础器件特征尺寸逐步缩小至其物理极限,能耗效应和量子效应等诸多问题使得摩尔定律的延续性存疑。另一方面,传统的计算体系和系统依托于冯·诺依曼架构,存储和计算功能的分离极大限制了计算能力的提升,冯·诺依曼瓶颈问题亟待解决。人类神经元及其中枢神经系统具有高效的信息获取、存储和处理能力,类神经或仿生神经元的开发是实现信息高效获取、传输、存储和计算的一种潜在方式。
生物体通过视觉、听觉、触觉、嗅觉等方式感知外界信息,继而通过神经传输和中枢系统完成信息的传输和处理,并做出相应响应,这一闭环系统的构建有效实现了信息交互。近些年来,对生物视、听、触、嗅等感知能力的结构仿生和功能模拟方面的研究取得了重要进展,性能方面可比拟甚至超越生物体。文献A bioinspired flexible organicartificial afferent nerve(Science 2018,360,998):斯坦福大学鲍哲南等人采用柔性有机电子器件模仿生物触觉神经元设计了触觉受体、传导轴突和突触的分布式网络架构,开发了一种人工触觉传入神经元,采用触觉传感器获取压力(1-80kPa)信息,接着采用环形振荡器(0-100Hz)将压力信息转换为动作电位,最后将动作电位与突触晶体管整合在一起,可完成对微动作信息的探测,有效地实现了复杂触觉信息的获取、传输和处理。文献Bio-inspired flexible artificial synapses for pain perception and nerve injuries(NPJ Flexible Electronics,2020,4(1):1-8.)受生物体痛觉机制启发,采用半导体单壁碳纳米管和聚环氧乙烷/高氯酸锂复合材料构建了一种柔性双层忆阻器,质子和锂离子存在于复合材料载体中,模仿生物体中钠离子和钾离子的功能,轻度痛觉刺激可引起后突触信号的增强,实现了仿生痛觉神经元的构建。随着信息科学、材料科学的发展,从物理机制和功能上模拟神经元和突触的器件逐渐出现,并用于开发信息获取、传输、存储和计算于一体的仿生神经系统。参考国内外对仿生神经元和人工突触的研究进展,当前研究主要集中于单一突触类器件和触觉仿生神经元的开发,作为获取客观世界极其重要的化学信息—气体信息的嗅觉感知发展相对滞后。综上所述,发展人工嗅觉纤维可模拟生物嗅觉机制实现嗅觉信息的获取、传输、存储和计算,对于构建新型嗅觉感知系统具有重要意义,符合嗅觉感知系统集成化、微型化、智能化的发展趋势。
生物神经元是神经系统最基本的结构和功能单位,主要包括细胞体和突起,具有信息获取、联络和整合输入信息的作用;对于人体嗅觉系统来说,其是由嗅上皮、嗅球和嗅皮层组成,具有嗅觉信息感知、传输、存储、处理等多重功能。人的嗅觉系统主要可分为三个结构层次:(1)嗅质(气体信息)中某些化学结构作为一种配体与嗅纤毛结合,嗅纤毛上的受体是接收嗅觉信息刺激的位点。转换成动作电位后由轴突传导至嗅小球的突触中,完成嗅觉信息的第一级处理,生物体嗅感觉神经元初级嗅觉神经元即嗅上皮,其构成嗅觉传感器与嗅觉神经,对于气味有高度灵敏性,而且这些初级神经的交叉灵敏度较高;(2)二级嗅觉神经元即嗅球及嗅神经,负责对嗅觉信号的初级处理,对初级神经元上传信息进行处理,包括调节、放大、抑制等,从而完成对嗅觉信号特征的提取;(3)大脑嗅觉中枢,是高级信息处理中心,负责对初级、二级所感知处理的嗅觉信号进行最终加工,并做出分析判断。受生物嗅觉感知机理启发,将柔性气体传感器、导电纤维和忆阻器等分立器件集成化、复合化,构建模拟生物嗅觉结构的柔性仿生人工嗅觉纤维,可实现具有多重功能的新型嗅觉感知系统,对于构建“感存算”(感知、存储、计算)一体化的嗅觉芯片和智能感知处理系统具有重要意义。
气体传感器作为一种可实现外界环境气体信息感知功能的电子器件,在环境保护、人工智能、医疗健康等领域具有广泛的应用前景,柔性化、便携式、低功耗、集成化是其发展的重要方向。另一方面,忆阻器,是表示磁通与电荷关系的电路器件。忆阻具有电阻的量纲,但和电阻不同的是,忆阻的阻值是由流经它的电荷确定。忆阻器作为一种有记忆功能的非线性电阻。通过控制电流的变化可改变其阻值,如果把高阻值定义为“1”,低阻值定义为“0”,即可实现存储信息/数据的功能,上述两类器件分别为具有单一信息获取、存储功能的器件。织物纤维作为柔性器件的载体时,比表面积大、疏松多孔、骨架结构丰富的纤维不仅有助于纤维骨架与各类功能材料的结合,其特有的类纤毛仿生结构有利于其作为受体实现嗅觉信息的感知,同时一维线型结构在形状上类似于树突,便于构建用于信息传输的人工树突。融合柔性纤维衬底与多种功能材料,开发一种人工嗅觉纤维,有望提升人工智能、物联网和大数据时代嗅觉信息获取、存储和处理的能力和水平。
发明内容
针对现有技术的以上缺陷或改进需求,本发明的目的在于提供一种人工嗅觉纤维及其制备方法,其中通过对人工嗅觉纤维的结构、组成等进行改进,将一维柔性纤维衬底分别与嗅觉受体感知功能材料、导电传导功能材料和忆阻功能材料结合,设计制备集成气体传感器、导电纤维和忆阻器功能的人工嗅觉纤维,能够分别模拟人工嗅觉感受器、嗅觉传导纤维和人工突触实现嗅觉信息的感知、传输和存储功能。本发明基于生物嗅觉机制,使分离的嗅觉信息感知、传输和存储功能通过仿生结构设计实现可模拟生物嗅觉功能的器件集成,完成嗅觉信息感知、传输和存储的结合,实现人工嗅觉纤维的设计。
为实现上述目的,按照本发明的一个方面,提供了一种人工嗅觉纤维,其特征在于,包括至少一个嗅觉感受单元、以及通过导电纤维与所述嗅觉感受单元相连的忆阻功能单元,其中,
所述嗅觉感受单元是以柔性纤维为衬底,以量子点材料作为嗅觉受体包覆修饰于柔性纤维上形成的;所述嗅觉感受单元用于对气体信息进行感知,引起嗅觉受体内电荷量变化;
所述导电纤维是将导电纳米材料修饰于柔性纤维上形成的;所述导电纤维用于实现嗅觉信息的传输;
所述忆阻功能单元是采用有机高分子聚合物、无机金属盐的任意一种或两种作为忆阻功能材料修饰在柔性纤维上形成忆阻器;所述忆阻功能单元用于作为人工突触完成嗅觉信息的传导和存储。
作为本发明的进一步优选,多个嗅觉感受单元通过对应的多个导电纤维与同一个忆阻功能单元相连,该忆阻功能单元用于作为人工突触完成嗅觉信息的汇聚和整合。
作为本发明的进一步优选,所述忆阻功能单元的后端还与信号处理和运算电路模块相连,所述信号处理和运算电路模块用于对来自忆阻功能单元的嗅觉信息进行运算处理。
作为本发明的进一步优选,所述人工嗅觉纤维包括多个忆阻功能单元,这些忆阻功能单元分别通过所述导电纤维连接至信息输出的接口,该接口用于对与之相连的忆阻功能单元的嗅觉信息进行汇聚和整合;
所述接口还与所述信号处理和运算电路模块相连,所述信号处理和运算电路模块用于对忆阻功能单元的嗅觉信息进行运算处理。
作为本发明的进一步优选,所述嗅觉感受单元中所采用的柔性纤维选自棉(cotton)纤维、棉包氨纶(cotton/polyurethane)纤维、棉涤包芯纱(cotton/polyester)纤维、聚氨酯(polyurethane)纤维、聚酰胺(polyamide)纤维;
所述量子点材料选自Bi2S3胶体纳米带、SnS胶体量子点、ZnS胶体量子点、SnO2胶体量子点、WO3胶体量子点、ZnO胶体量子点、In2O3胶体量子点或NiO胶体量子点。
作为本发明的进一步优选,所述导电纤维中所采用的柔性纤维与所述嗅觉感受单元中所采用的柔性纤维种类相同。
作为本发明的进一步优选,所述导电纤维中所采用的导电纳米材料选自碳系纳米材料或金属纳米粒子;
优选的,所述碳系纳米材料包括炭黑、碳纳米管;所述金属纳米粒子包括银纳米粒子。
作为本发明的进一步优选,所述有机高分子聚合物优选选自聚乙烯醇、聚环氧乙烷;所述无机金属盐优选选自高氯酸锂、高氯酸钠和硫酸镁。
按照本发明的另一方面,本发明提供了制备上述人工嗅觉纤维的方法,其特征在于,包括以下步骤:
(1)将量子点材料沉积包裹于柔性纤维衬底上,制备柔性嗅觉感受器单元;
(2)将高电导率纳米材料沉积包裹于柔性纤维衬底上,制备柔性导电纤维;
(3)将步骤(1)制备的嗅觉感受器单元与导电纤维连接,以实现嗅觉感知信息在导电纤维上的传递;
(4)采用有机高分子聚合物、无机金属盐的任意一种或两种作为忆阻功能材料修饰在柔性纤维上形成忆阻器,并将所述步骤(3)得到的所述导电纤维与所述忆阻器中的所述柔性纤维相连;所述忆阻器用于作为人工突触完成嗅觉信息的传导和存储。
作为本发明的进一步优选,所述方法还包括步骤:
(5)将步骤(4)得到的忆阻器的后端与信号处理和运算电路模块相连,所述信号处理和运算电路模块用于对嗅觉信息进行运算处理。
通过本发明所构思的以上技术方案,与现有技术相比,能够取得以下有益效果:
(1)基于生物嗅觉机制,将传统的嗅觉信息感知、传输和存储功能分离的器件,基于人体嗅觉机理和系统构建仿生式集成器件,实现嗅觉信息感知、传输、存储与处理功能的结合,达到人工嗅觉纤维的设计。本发明中的人工嗅觉纤维实现了嗅觉信息感知、传输和存储功能的集成,本发明是利用量子点作为嗅觉感知材料,构建气体传感器(即嗅觉感受单元),从气体传感领域来看,相较于普通纳米半导体颗粒,胶体量子点材料具有独特的量子限域效应、量子隧穿效应等,存在与晶粒尺寸相关的可调电子能级结构,可实现与气体分子的最佳匹配,零维半导体量子点具有更大的比表面积,拥有更多的表面活性吸附位点,表面活性大大增强,呈现出独特的物化特性;可用于对嗅质(气体信息)的嗅觉感知(当量子点材料感知目标气体并与其发生反应时,通过换能作用引起人工嗅觉纤维电学信号如电阻,电流的变化);导电纤维则是作为人工树突实现嗅觉信息的传输;忆阻器(即忆阻功能单元)则是作为人工突触完成嗅觉信息的存储,尤其可以完成嗅觉信息的汇聚和整合。
(2)本发明提出的基于柔性纤维衬底的人工嗅觉纤维具有器件结构简单、轻质、便携性、信息感知与传出复合功能化等优势,有效拓宽了基于气体传感器或忆阻器的器件使用范围。
(3)本发明人工嗅觉纤维区别于传统的仅具有嗅觉信息感知能力的气体传感器,同时也区别于仅具有信息存储功能的忆阻器,其将上述两种具备单一功能的器件通过仿生结构设计实现了器件在物理层面的集成和功能层面上的复合化,它不仅能够感知信息,也能够存储信息。进一步的,人工嗅觉纤维还可作为输入连接到逻辑处理电路。这为下一代新电子器件,特别是解决冯诺依曼瓶颈提供了技术储备。
本发明的人工嗅觉纤维,可以将若干嗅觉感受器单元通过对应的若干导电纤维结合汇聚到同一个节点,并与人工突触(即忆阻功能单元)连接,实现嗅觉感知信息的第一级整合处理;并且,还可将人工突触后端与导电纤维连接,实现嗅觉信息的存储,集成信号处理和运算模块,实现嗅觉信息的终端处理。忆阻器作为人工突触完成嗅觉信息的汇聚和整合,最后可将嗅觉信息传递至整个人工嗅觉纤维的接口处,将其作为信息输出端,可与信号处理和运算等电路模块连接构建“感存算”一体化的嗅觉芯片和智能感知处理系统。
综上,借鉴人体嗅觉机理和系统架构,本发明将柔性气体传感器、导电纤维和忆阻器等分立器件集成化,构建模拟生物嗅觉结构的柔性仿生人工嗅觉纤维,设计基于柔性纤维的人工嗅觉系统,可实现具有嗅觉信息感知、传输、存储等功能的仿生嗅觉系统。柔性嗅觉感受器采用柔性纤维衬底,具有轻质、高柔弹性、可弯曲、便携性等特点,可丰富器件在物联网、人工智能、可穿戴等领域的应用范围。
附图说明
图1是本发明中的人工嗅觉纤维实现流程示意图。
图2是本发明中的人工嗅觉纤维整体架构示意图。
具体实施方式
为了使本发明的目的、技术方案及优点更加清楚明白,以下结合附图及实施例,对本发明进行进一步详细说明。应当理解,此处所描述的具体实施例仅仅用以解释本发明,并不用于限定本发明。此外,下面所描述的本发明各个实施方式中所涉及到的技术特征只要彼此之间未构成冲突就可以相互组合。
总体来说,本发明人工嗅觉纤维制备方法,包括以下步骤:(1)量子点材料作为嗅觉受体,将其包覆于柔性纤维衬底上,作为人工嗅觉纤维的嗅觉信息感知层;(2)将高电导率纳米材料修饰于柔性纤维上构建嗅觉信息传输层;(3)采用有机高分子聚合物(例如,聚乙烯醇、聚环氧乙烷等)、无机金属盐(如,高氯酸锂、高氯酸钠和硫酸镁等)的任意一种或两种作为忆阻功能材料修饰在柔性纤维上构筑忆阻功能层;(4)通过仿生设计和器件集成构建基于气体传感器、导电纤维和忆阻器的人工嗅觉纤维。
忆阻功能材料可以由有机高分子聚合物、无机金属盐的任意一种或两种材料构成,或者由有机高分子聚合物、无机金属盐中任意一种经过改性、修饰等工艺处理后制备的材料构成。
借鉴人体嗅觉机理和系统架构:嗅质(气体信息)与嗅感觉神经元中的特异性受体结合,受体被激活产生一种动作电位信号,随后通过嗅神经传递至嗅小球中,嗅球与其他细胞之间构成突触,完成嗅觉信息的汇聚和整合,接着通过树突将整合后的信息传递至僧帽细胞等,完成对嗅觉信息的进一步加工和处理,接着通过传出纤维将加工后的嗅觉信息传递到嗅皮层。
本发明借鉴上述机理和架构,将柔性纤维气体传感器、导电纤维和忆阻器等分立器件集成化,构建模拟生物嗅觉结构的仿生人工嗅觉纤维,设计基于柔性纤维的人工嗅觉系统,可实现具有嗅觉信息感知、传输、存储等功能的仿生嗅觉系统。
本发明所述人工嗅觉纤维实现流程如图1所示,首先仿生嗅觉受体材料实现对嗅质(气体信息)的嗅觉感知,通过导电纤维(人工树突)完成对嗅觉信息的传递,不同嗅觉感受器感知的嗅觉信息结合汇聚到同一个节点,并与人工突触连接,实现嗅觉感知信息的第一级处理和存储;上述信息通过导电纤维传递至接口,将其作为信息输出端,可与信号处理和运算等电路模块连接构建“感存算”一体化的嗅觉芯片和智能感知处理系统。
本发明所述人工嗅觉纤维整体架构借鉴人体嗅觉系统,如图2所示,主要包括1-嗅觉信息感知层、2-嗅觉信息汇聚层、3-嗅觉信息加工层,4-嗅觉处理中枢,即可与计算、存储等电路模块构成信息处理中枢的接口。所述嗅觉信息感知层对应于人体嗅感觉神经元,以一维柔性纤维为衬底(具体例如可以为棉纤维或棉包氨纶纤维),嗅觉信息受体材料为量子点(具体例如可以为PbS量子点),作为人工嗅觉纤维的嗅觉信息感知层,该嗅觉信息感知层在一定的机械应变程度内可保持较稳定的响应(即,具有柔性化的功能特征,可在一定机械应变作用下保持气体传感功能,满足当前智能化、柔性电子的发展趋势),同时响应恢复特性可较好得维持。所述嗅觉信息汇聚层对应于人体嗅神经树突和嗅球,将嗅觉信息感知层接收的信息通过树突在嗅球处进行汇聚和整合,将高电导率纳米材料修饰于柔性纤维上构建导电纤维传递嗅觉信息,接着采用有机高分子聚合物、无机金属盐的任意一种或两种作为忆阻功能材料修饰在柔性纤维上构筑忆阻功能层;所述嗅觉信息加工层对应于人体僧帽细胞等处理神经元,通过导电纤维传递至接口,对嗅觉信息进行进一步处理。所述嗅觉处理中枢对应人体嗅皮层,所述人工嗅觉纤维可作为信息输出的接口,尤其可与信号处理和运算等电路模块连接构建“感存算”一体化的嗅觉芯片和智能感知处理系统。
以下为具体实施例:
实施例1
该实施例包括以下步骤:
(1)合成PbS胶体量子点。可以用PbO作为铅源,六甲基二硅硫烷(TMS)作为硫源,采用胶体化学法合成。将PbS量子点嗅觉受体材料分散在正辛烷中得到浓度为50mg/mL的PbS量子点溶液;
(2)将量子点材料沉积包裹于棉纤维衬底上,制备若干柔性嗅觉感受器单元;具体地,将清洗干燥后的棉纤维浸渍于步骤(1)得到的PbS量子点溶液中,磁力搅拌1h,通过浸渍搅拌的工艺完成量子点嗅觉受体材料的包覆;接着将上述样品悬空放置,采用滴注法将10mg/mL的硝酸铅Pb(NO3)2溶液逐滴滴加于样品上,使盐溶液液滴润湿整个样品后流出,然后采用滴注法将甲醇逐滴滴加于样品上,使甲醇液滴润湿整个样品后流出,重复上述滴注法两次,后将样品置于50℃的烘箱中干燥30min,从而制备得到柔性嗅觉感受器;
(3)将一定量炭黑溶于溶剂石脑油中,搅拌均匀后,再依次超声分散1h、磁力搅拌1h,得到20mg/mL的炭黑导电溶液;将清洗干燥后的棉纤维浸渍于上述溶液中30min,然后置于烘箱中50℃下干燥3h,即制得炭黑导电纤维。
(4)将步骤(2)制备的若干嗅觉感受器分别与导电纤维连接,以实现嗅觉感知信息在导电纤维上的传递:具体的,将步骤(2)制备的若干嗅觉感受器分别缠绕在炭黑导电纤维表面,连接处采用聚酰亚胺胶带包裹封装,以实现嗅觉感知信息在导电纤维上的传递;也就是说,导电纤维用于实现嗅觉信息的传输,这些嗅觉信息存在的形式可以是电荷或者电流;
(5)将若干导电纤维结合汇聚到同一个节点,并与人工突触连接,实现嗅觉感知信息的第一级处理和存储:具体的,
先将步骤(3)制备的导电纤维置于0.5wt%聚环氧乙烷水溶液中磁力搅拌30min(聚环氧乙烷即功能材料),取出后用去离子水清洗,在100℃的烘箱中干燥10min;采用金属丝电极缠绕于上述样品中(金属丝电极是作为忆阻器中与导电纤维衬底电极相配合的另一电极,),从而制得人工突触(即柔性忆阻器)。
然后,将若干导电纤维彼此缠绕聚合到同一个节点,并通过该节点将这些导电纤维与制得的人工突触相连接,从而能够实现嗅觉感知信息的第一级处理和存储;
进一步的,还可以包括:(6)将步骤(5)得到的人工突触的导电纤维部分与其他人工突触的导电纤维部分缠绕连接,按照一定的连接方式构成信息输出的接口,可进一步集成信号处理和运算模块,实现嗅觉信息的终端处理。
实施例2
该实施例包括以下步骤:
(1)制备SnO2量子点。可以用SnCl4·5H2O作为锡源,油酸和油胺长链有机配体作为包裹剂,采用溶剂热法反应生成。将SnO2量子点嗅觉受体材料分散在甲苯中得到浓度为50mg/mL的SnO2量子点溶液;
(2)将SnO2量子点材料沉积包裹于棉包氨纶纤维衬底上,制备若干柔性嗅觉感受器单元;具体地,将清洗干燥后的棉包氨纶纤维浸渍于步骤(1)得到的SnO2量子点溶液中,磁力搅拌1h,通过浸渍搅拌的工艺完成量子点嗅觉受体材料的包覆;接着将上述样品悬空放置,采用滴注法将10mg/mL的AgNO3甲醇溶液逐滴滴加于样品上,使无机盐溶液液滴润湿整个样品后流出,重复上述滴注法两次,后将样品置于50℃的烘箱中干燥30min,从而制备得到柔性嗅觉感受器;
(3)将一定量银纳米粒子溶于溶剂石脑油中,搅拌均匀后,再依次超声分散1h、磁力搅拌1h,得到20mg/mL的银纳米粒子导电溶液;将清洗干燥后的棉包氨纶纤维浸渍于上述溶液中30min,然后置于烘箱中50℃下干燥3h,即制得导电纤维。
(4)将步骤(2)制备的若干嗅觉感受器分别缠绕在银纳米粒子导电纤维表面,连接处采用聚酰亚胺胶带包裹封装,以实现嗅觉感知信息在导电纤维上的传递;
(5)将步骤(3)制备的导电纤维置于2wt%聚乙烯醇水溶液中磁力搅拌30min,取出后用去离子水清洗,在100℃的烘箱中干燥10min;采用金属丝电极缠绕于上述样品中,从而制得人工突触(即柔性忆阻器)。
(6)将步骤(4)得到的若干导电纤维结合汇聚到同一个节点,并与步骤(5)得到的人工突触相连,由于这些导电纤维与人工突触相连接,从而能够实现嗅觉感知信息的第一级处理和存储;
进一步的,还可以包括:(7)将步骤(6)得到的人工突触的导电纤维部分与其他人工突触的导电纤维部分缠绕连接,按照一定的连接方式构成信息输出的接口,可进一步集成信号处理和运算模块,实现嗅觉信息的终端处理。
实施例3
该实施例包括以下步骤:
(1)制备Bi2S3纳米带。可以用三苯基铋作为铋源,二苄基二硫作为硫源,油胺长链有机配体作为包裹剂,采用溶剂热法反应生成。将Bi2S3纳米带嗅觉受体材料分散在乙醇中得到浓度为50mg/mL的Bi2S3纳米带溶液;
(2)将Bi2S3纳米带材料沉积包裹于棉涤包芯纱纤维衬底上,制备若干柔性嗅觉感受器单元;具体地,将清洗干燥后的棉涤包芯纱纤维浸渍于步骤(1)得到的Bi2S3纳米带溶液中,磁力搅拌1h,通过浸渍搅拌的工艺完成量子点嗅觉受体材料的包覆;接着将上述样品悬空放置,采用滴注法将10mg/mL的NaNO2甲醇溶液逐滴滴加于样品上,使无机盐溶液液滴润湿整个样品后流出,重复上述滴注法两次,后将样品置于50℃的烘箱中干燥30min,从而制备得到柔性嗅觉感受器;
(3)将一定量碳纳米管溶于溶剂石脑油中,搅拌均匀后,再依次超声分散1h、磁力搅拌1h,得到20mg/mL的碳纳米管导电溶液;将清洗干燥后的棉涤包芯纱纤维浸渍于上述溶液中30min,然后置于烘箱中50℃下干燥3h,即制得导电纤维。
(4)将步骤(2)制备的若干嗅觉感受器分别缠绕在碳纳米管导电纤维表面,连接处采用聚酰亚胺胶带包裹封装,以实现嗅觉感知信息在导电纤维上的传递;
(5)将步骤(3)制备的导电纤维置于2wt%聚乙烯醇水溶液中磁力搅拌30min,取出后用去离子水清洗,在100℃的烘箱中干燥10min;采用金属丝电极缠绕于上述样品中,从而制得人工突触(即柔性忆阻器)。
(6)将步骤(4)得到的若干导电纤维结合汇聚到同一个节点,并与步骤(5)得到的人工突触相连,由于这些导电纤维与人工突触相连接,从而能够实现嗅觉感知信息的第一级处理和存储;
进一步的,还可以包括:(7)将步骤(6)得到的人工突触的导电纤维部分与其他人工突触的导电纤维部分缠绕连接,按照一定的连接方式构成信息输出的接口,可进一步集成信号处理和运算模块,实现嗅觉信息的终端处理。
实施例4
该实施例包括以下步骤:
(1)制备WO3量子点。可以用六氯化钨作为钨源,油酸和油胺长链有机配体作为包裹剂,采用溶剂热法反应生成。将WO3量子点嗅觉受体材料分散在甲苯中得到浓度为50mg/mL的WO3量子点溶液;
(2)将WO3量子点材料沉积包裹于聚氨酯纤维衬底上,制备若干柔性嗅觉感受器单元;具体地,将清洗干燥后的聚氨酯纤维浸渍于步骤(1)得到的WO3量子点溶液中,磁力搅拌1h,通过浸渍搅拌的工艺完成量子点嗅觉受体材料的包覆;接着将上述样品悬空放置,采用滴注法将50mg/mL的CuCl2甲醇溶液逐滴滴加于样品上,使无机盐溶液液滴润湿整个样品后流出,重复上述滴注法两次,后将样品置于50℃的烘箱中干燥30min,从而制备得到柔性嗅觉感受器;
(3)将一定量碳纳米管溶于溶剂石脑油中,搅拌均匀后,再依次超声分散1h、磁力搅拌1h,得到20mg/mL的碳纳米管导电溶液;将清洗干燥后的聚氨酯纤维浸渍于上述溶液中30min,然后置于烘箱中50℃下干燥3h,即制得导电纤维。
(4)将步骤(2)制备的若干嗅觉感受器分别缠绕在碳纳米管导电纤维表面,连接处采用聚酰亚胺胶带包裹封装,以实现嗅觉感知信息在导电纤维上的传递;
(5)将步骤(3)制备的导电纤维置于2wt%聚乙烯醇水溶液中磁力搅拌30min,取出后用去离子水清洗,在100℃的烘箱中干燥10min;采用金属丝电极缠绕于上述样品中,从而制得人工突触(即柔性忆阻器)。
(6)将步骤(4)得到的若干导电纤维结合汇聚到同一个节点,并与步骤(5)得到的人工突触相连,由于这些导电纤维与人工突触相连接,从而能够实现嗅觉感知信息的第一级处理和存储;
进一步的,还可以包括:(7)将步骤(6)得到的人工突触的导电纤维部分与其他人工突触的导电纤维部分缠绕连接,按照一定的连接方式构成信息输出的接口,可进一步集成信号处理和运算模块,实现嗅觉信息的终端处理。
本发明实施例制备的人工嗅觉纤维具有较好的柔性、轻便性、便携性,同时可实现大规模制备。与传统的仅具有嗅觉信息感知能力的气体传感器和信息存储功能的忆阻器不同,所述人工嗅觉纤维将单一功能的器件通过仿生结构设计实现了器件在物理层面的集成和功能层面上的复合,它不仅能够感知嗅觉信息,也能够传递、存储嗅觉信息。进一步的,人工嗅觉纤维还可作为信息输出的接口连接到计算、存储等电路模块。这为下一代新电子器件,特别是解决冯诺依曼瓶颈提供了技术储备。
本发明的人工嗅觉纤维及其制备方法并不局限于上述实施例,具体地,嗅觉信息受体材料采用的量子点材料并不限于PbS或者SnO2量子点,也可以是其它量子点嗅觉感知材料如Bi2S3纳米带、SnS量子点、ZnS量子点、WO3量子点、ZnO量子点、In2O3量子点或NiO量子点等。
本领域的技术人员容易理解,以上所述仅为本发明的较佳实施例而已,并不用以限制本发明,凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等,均应包含在本发明的保护范围之内。
Claims (10)
1.一种人工嗅觉纤维,其特征在于,包括至少一个嗅觉感受单元、以及通过导电纤维与所述嗅觉感受单元相连的忆阻功能单元,其中,
所述嗅觉感受单元是以柔性纤维为衬底,以量子点材料作为嗅觉受体包覆修饰于柔性纤维上形成的;所述嗅觉感受单元用于对气体信息进行感知,引起嗅觉受体内电荷量变化;
所述导电纤维是将导电纳米材料修饰于柔性纤维上形成的;所述导电纤维用于实现嗅觉信息的传输;
所述忆阻功能单元是采用有机高分子聚合物、无机金属盐的任意一种或两种作为忆阻功能材料修饰在柔性纤维上形成忆阻器;所述忆阻功能单元用于作为人工突触完成嗅觉信息的传导和存储。
2.如权利要求1所述人工嗅觉纤维,其特征在于,多个嗅觉感受单元通过对应的多个导电纤维与同一个忆阻功能单元相连,该忆阻功能单元用于作为人工突触完成嗅觉信息的汇聚和整合。
3.如权利要求1所述人工嗅觉纤维,其特征在于,所述忆阻功能单元的后端还与信号处理和运算电路模块相连,所述信号处理和运算电路模块用于对来自忆阻功能单元的嗅觉信息进行运算处理。
4.如权利要求1所述人工嗅觉纤维,其特征在于,所述人工嗅觉纤维包括多个忆阻功能单元,这些忆阻功能单元分别通过所述导电纤维连接至信息输出的接口,该接口用于对与之相连的忆阻功能单元的嗅觉信息进行汇聚和整合;
所述接口还与所述信号处理和运算电路模块相连,所述信号处理和运算电路模块用于对忆阻功能单元的嗅觉信息进行运算处理。
5.如权利要求1所述人工嗅觉纤维,其特征在于,所述嗅觉感受单元中所采用的柔性纤维选自棉(cotton)纤维、棉包氨纶(cotton/polyurethane)纤维、棉涤包芯纱(cotton/polyester)纤维、聚氨酯(polyurethane)纤维、聚酰胺(polyamide)纤维;
所述量子点材料选自Bi2S3胶体纳米带、SnS胶体量子点、ZnS胶体量子点、SnO2胶体量子点、WO3胶体量子点、ZnO胶体量子点、In2O3胶体量子点或NiO胶体量子点。
6.如权利要求1所述人工嗅觉纤维,其特征在于,所述导电纤维中所采用的柔性纤维与所述嗅觉感受单元中所采用的柔性纤维种类相同。
7.如权利要求1所述人工嗅觉纤维,其特征在于,所述导电纤维中所采用的导电纳米材料选自碳系纳米材料或金属纳米粒子;
优选的,所述碳系纳米材料包括炭黑、碳纳米管;所述金属纳米粒子包括银纳米粒子。
8.如权利要求1所述人工嗅觉纤维,其特征在于,所述有机高分子聚合物优选选自聚乙烯醇、聚环氧乙烷;所述无机金属盐优选选自高氯酸锂、高氯酸钠和硫酸镁。
9.制备如权利要求1-8任意一项所述人工嗅觉纤维的方法,其特征在于,包括以下步骤:
(1)将量子点材料沉积包裹于柔性纤维衬底上,制备柔性嗅觉感受器单元;
(2)将高电导率纳米材料沉积包裹于柔性纤维衬底上,制备柔性导电纤维;
(3)将步骤(1)制备的嗅觉感受器单元与导电纤维连接,以实现嗅觉感知信息在导电纤维上的传递;
(4)采用有机高分子聚合物、无机金属盐的任意一种或两种作为忆阻功能材料修饰在柔性纤维上形成忆阻器,并将所述步骤(3)得到的所述导电纤维与所述忆阻器中的所述柔性纤维相连;所述忆阻器用于作为人工突触完成嗅觉信息的传导和存储。
10.如权利要求9所述方法,其特征在于,所述方法还包括步骤:
(5)将步骤(4)得到的忆阻器的后端与信号处理和运算电路模块相连,所述信号处理和运算电路模块用于对嗅觉信息进行运算处理。
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