Oxide Zinc Nanorod Array Modification of Silk for Wearable Physiological Sensing Applications
Silk is a natural protein fiber with the advantages of smoothness,skin-friendliness,and high mechanical strength.It has been used as a textile fiber in China for thousands of years.With the advent of the intelligent era,textile electronics has at-tracted great attention from both academics and industry,but the study on silk fiber in wearable applications is still very weak.In this work,a low-cost method for in situ modification of zinc oxide(ZnO)nanorod arrays on the surface of single silk fibers was developed.ZnO nanorod arrays supported by single silk fibers were successfully prepared.The ZnO nanorods were densely and uniformly grown vertically on the silk surface,with a diameter of 100～200 nm,a length of about 2 μm and a hexagonal wurtzite structure.Utilizing the piezoelectric properties of ZnO nanorods,we constructed a piezoelectric sensor based on the ZnO-nanorods-modified silk.The sensor can effectively convert mechanical energy into electrical energy,responding to finger tapping,pressing,and bending movements in real time.The vital parameters such as human respiration and heartbeat could al-so be effectively monitored by the sensor fixed on the abdomen and the heart area on the body surface.In addition,the sensor can distinguish the changes in musical pitch and scale during xylophone tapping.The as-prepared silk-based piezoelectric sensor demonstrates great potential in real-time monitoring of human movement and physiological parameters.This work may expand the practical applications of silk in wearable devices and smart sensing.
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