Preparation And Properties Of Patterned Stretchable Au/SWCNTs Composite Electrode

With the rapid development of new-generation electronic devices such as elastic bionic electronic skin,wearable smart devices,and flexible smart display products,stretchable conductive materials have attracted much attention.At present,there are many kinds of stretchable conductive materials,which are mainly classified into metals,conductive polymers,carbon materials.These materials have successfully fabricated devices such as stretchable multi-function sensors,lithium ion batteries,and field effect transistors.Among them,gold has the most widely used electrode materials because of its high electrical conductivity,good mechanical ductility and excellent stability.However,due to its very high young's modulus,it is prone to fracture in the process of stretching,so it cannot be applied to the above wearable devices.In order to solve this problem,many people use a structured way to improve the tensile properties of gold,but this way will inevitably lead to low integration and poor fitness of devices.Based on this,this paper combines the high conductivity of gold and high aspect ratio of carbon nanotubes to achieve complementary advantages.Photolithography technology is used to prepare the patterned composite electrode with high tensile and good conductivity,which is used as the conductive connection wire in the stretchable conductive interconnection circuit.The main research contents are as follows:1.The flexible stretchable gold film was obtained on a hydrophobic substrate by a mechanical stripping method.Although the tensile strain was as high as 96%,the size of the films is too large to be used in integrated devices.In order to solve the above problems,a patterned gold electrode with a width of 100 um and a length of 10 mm was fabricated based on photolithography.Its elongation at break is 1%,and its tensile properties need to be further improved.2.In order to improve the tensile properties of patterned gold electrodes,this paper combines the mechanical stretching of carbon nanotubes,using photolithography and mercaptoethylamine modification to prepare patterned stretchable gold/carbon nanotube composite electrodes.The effect of mercaptoethylamine modification on the tensile properties of the electrode was investigated.The results show that the modified composite electrode can be stretched to 175%,and the carbon nanotubes have strong adhesion on the gold surface,showing its application prospects in wearable devices.3.The effects of different line widths and carbon nanotube layers on the mechanical properties of the composite electrode were studied.The results showed that the width of the patterned line was 100 m,and the number of carbon nanotube layers was 25,which was the most favorable for the composite electrode stretching.And cyclically stretching 1000 times at 10% strain,the composite electrode still maintains good electrical conductivity and can return to the initial resistance.In addition,it is applied to the joints of the fingers,between the book seams and the edge of the book pages,applying different degrees of mechanical deformation,and the composite electrode can still illuminate the LED,demonstrating its potential application in the field of wearable and implantable electronics.