基于coffee-ring效应的银纳米粒子可控组装及其应变传感性能研究

项目名称： 基于coffee-ring效应的银纳米粒子可控组装及其应变传感性能研究

项目编号： No.21303091

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 数理科学和化学

项目作者： 张志良

作者单位： 齐鲁工业大学

项目金额： 25万元

中文摘要： 应变传感器广泛应用于桥梁建筑、石油化工和航空航天等工程技术领域，鉴于金属和半导体应变传感器存在灵敏系数低、应变伸长率小等诸多问题，本课题提出了利用喷墨打印过程中的coffee-ring效应在柔性基底上组装有序的银纳米粒子线（AgNWs）阵列，制备基于AgNWs阵列为敏感介质的高效应变传感器的研究思路。设计通过调节溶剂表面张力和基底浸润性等方法调控coffee-ring效应的大小，使打印液滴具有稳定的三相接触线和向着液滴边缘的marangoni效应，诱导纳米粒子形成形貌可控的AgNWs阵列；通过控制AgNWs阵列形貌、基底拉伸速度和应变伸长率，建立AgNWs阵列结构与应变传感性能之间的构效关系，获得灵敏系数高和应变伸长率大的高效应变传感器；在此基础上，分析和阐明该类传感器的应变传感机制，为喷墨打印技术在纳米粒子组装和传感器构筑领域获得广泛应用奠定坚实的基础。

中文关键词： 咖啡环效应；可控组装；浸润性；喷墨打印；应变传感器

英文摘要： Strain sensors are widely used in the bridge construction, petrochemical engineering and aerospace system fields, etc. In view of the problems encountered in the metal and semiconductor strain sensors where the sensitive coefficient is low and the strain elongation is small, this project proposes a novel research idea that the highly ordered silver nanoparticles wires (AgNWs) arrays are assembled on the flexible substrates by utilizing coffee-ring effect in the ink-jet printing process, and strain sensors are fabricated based on AgNWs array for sensitive medium. Firstly, the coffee-ring effect is regulated by the solvent surface tension and substrate wettability, and make the printed droplets possess the stable three-phase contact line and marangoni effect toward the edge of the droplets, which enable silver nanoparticles to automatically assemble to form highly regular AgNWs arrays. Secondly, the high sensitivity coefficient, large strain elongation and highly stable strain sensors will be obtained by controlling AgNWs array morphology, drawing speed and strain elongation.Based on the above research results, the strain sensing mechanism of such sensors are analyzed and elucidated, and the structure-activity relationship between the AgNWs structure and strain sensing properties will be established. This study wi

英文关键词： coffee-ring effect；controllable assembly；wettability；inkjet printing；strain senors