光驱动软体致动器的制备及其信息安全应用  

Fabrication of light-driven soft actuator and its information security application

作　　者：陈原浩 吕鹏飞 杨梦园 冯奕钰[1] 封伟[1] 王玲[1] CHEN Yuan-hao;LYU Peng-fei;YANG Meng-yuan;FENG Yi-yu;FENG Wei;WANG Ling(School of Materials Science and Engineering, Tianjin University, Tianjin 300350, China)

机构地区：[1]天津大学材料科学与工程学院,天津300350

出　　处：《液晶与显示》2021年第2期229-236,共8页Chinese Journal of Liquid Crystals and Displays

基　　金：国家自然科学基金(No.51973155)。

摘　　要：为了提高信息安全,防止信息泄露,进一步拓宽柔性器件在信息安全领域的应用,本文报道了一种基于双层膜光驱动软体致动器的新型信息示假隐真技术。首先,将所制得的不同长径比的金纳米棒通过图案遮罩和涂覆的方法,均匀地分散到聚丙烯/聚酰亚胺复合薄膜体系中,制得双层膜光热驱动软体致动器,接着将软体致动器进行选择性剪切。当无外界光刺激时,我们把该双层膜所呈现的信息定义为第一种假信息;当外界相应波长的激发光刺激该软体致动器时,该器件由于发生形变可以展示出另外一种信息,我们定义为第二种假信息;由于不同的金纳米棒在相应波长光激发下才具有最高的光热转化效率,因此通过红外相机所观察到的不同区域的温度呈现出一种新的图案,我们定义为真信息,起到信息示假隐真作用。实验结果表明未接受光照时,软体致动器处于平整状态;在相应波长激光刺激下,被切割部分的软体致动器弯曲角可达到50°以上,裸眼可以清晰地观测所显示信息;而通过红外相机观测到光热区域与非光热区域温度相差至少在10℃以上,可以明显看到所显示的真信息。将软体致动器与信息示假隐真结合在一起,具有新颖性,而且效果明显,为信息安全问题提供了一个新的解决方案。In order to improve the security and reduce the leakage of information,and further broaden the application fields of information privacy,this work reported a novel information cheating technology based on a light-driven bimorph soft actuator.Firstly,the as-prepared gold nanorods with different aspect ratios were uniformly dispersed into the polypropylene/polyimide composite membrane by means of mask depositing and coating,and then a photothermal biomorph soft actuator was fabricated,after that,the obtained bimorph soft actuator was selectively cut.Herein,we defined the state presented by the bimorph soft actuator without external light stimulation as the first information;only when triggered by the corresponding laser,this soft actuator could display second type of information,which we defined as the second false information;since the highest photothermal conversion of gold nanorods only occurred under the laser with corresponding wavelength,the temperature of different areas observed by the infrared camera showed the new information,which played an important role in information cheating.The experimental results showed that the soft actuator kept in flat state without illumination,and the cutting area of bimorph soft actuators reached a bending angle of at least 50°under the stimulation of corresponding laser,thus the displayed information can be clearly observed by the naked eye;while the difference of photothermal area and non-photothermal area can only be observed in the infrared camera,where the gap of temperature was at least 10℃,and the displayed true information could be clearly seen.The combination of the soft actuators and the information cheating is novel and effective,which provides a new strategy toward development and future of information security issues.

关 键 词：信息安全 软体致动器 金纳米棒 光热效应 

分 类 号：TP394.1[自动化与计算机技术—计算机应用技术] TH691.9[自动化与计算机技术—计算机科学与技术]