Self-powered and flexible piezo-sensors based on conductivitycontrolled GaN nanowire-arrays for mimicking rapid-and slow-adapting mechanoreceptors  

作　　者：Aadil Waseem Ameer Abdullah Indrajit V.Bagal Jun-Seok Ha June Key Lee Sang-Wan Ryu 

机构地区：[1]Department of Physics,Chonnam National University,Gwangju 61186,Republic of Korea [2]Optoelectronics Convergence Research Center,Chonnam National University,Gwangju 61186,Republic of Korea

出　　处：《npj Flexible Electronics》2022年第1期642-652,共11页npj-柔性电子（英文）

基　　金：supported by the National Research Foundation of Korea (NRF),funded by the Ministry of Education,Science,and Technology (2018R1A6A1A03024334,2021M3D1A2039641).

摘　　要：Human skin contains slowly adaptive(SA)and rapidly adaptive(RA)mechanoreceptors,which respond differently to external stimuli.Based on human tactile perception principles,the fabrication of a self-powered electronic skin(e-skin)that simultaneously mimics SA-and RA-mechanoreceptors is a prime need for robots and artificial prosthetics to interact with the surrounding environment.However,the complex process of merging multimode sensors to mimic SA-and RA-mechanoreceptors hinders their utilization in e-skins.We proposed SA-and RA-mechanoreceptors based on n-type and semi-insulating GaN nanowire arrays.The SA-and RA-mechanoreceptors demonstrated distinguished features such as grasping of objects and detection of their surface textures.Based on piezoelectric sensing principles,the proposed e-skin can simultaneously mimic static and dynamic pressure signals.Mechanoreceptors further detected several stimuli of various pressures with low and high frequencies.The response and reset times showed by SA-mechanoreceptors were 11 and 18 ms under 1-Hz frequency,which are rapid enough for practical e-skin applications.

关 键 词：ARRAYS RAPID conductivity 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]