Kinetic liquid metal synthesis of flexible 2D conductive oxides for multimodal wearable sensing  

作　　者：Md Saifur Rahman Simon A.Agnew Samuel W.Ong William J.Scheideler 

机构地区：[1]Thayer School of Engineering Dartmouth College,Hanover,NH,USA

出　　处：《npj Flexible Electronics》2024年第1期65-73,共9页npj-柔性电子(英文)

基　　金：supported by the Dartmouth PhD Innovation Fellowship;This research was supported by the National Science Foundation Electronic and Photonic Materials Program(Award#2202501);the National Science Foundation Electronics,Photonics,and Magnetic Devices program(Award#2219991).

摘　　要：Transparent conducting oxides(TCOs)are crucial for high-performance displays,solar cells,and wearable sensors.However,their high process temperatures and brittle nature have hindered their use in flexible electronics.In this paper,we overturn these limitations by harnessing Cabrera-Mott oxidation to fabricate large-area,two-dimensional(2D)transparent electrodes via liquid metal printing.Our robotic,vacuum-free process deposits ultrathin(2–10 nm)indium tin oxide(ITO)with exceptional flexibility,transparency(>95%)and conductivity(>1300 S/cm)by utilizing hypoeutectic In-Sn alloys to print at<140℃.Detailed characterization reveals the efficacy of Sn-doping and high crystallinity with large,platelike grains.The ultrathin nature enhances bending strain tolerance and scratch resistance,exceeding durability of PEDOT and offering low contact impedance to skin comparable to Ag/AgCl.We implement 2D ITO in synchronous,multimodal electrocardiography(ECG)and pulse plethysmography(PPG)measurements.This order-of-magnitude improvement to printed TCOs could enable wearable biometrics and display-integrated sensors.

关 键 词：WEAR OXIDES liquid 

分 类 号：TG1[金属学及工艺—金属学]