| Based on the broad application prospects of wearable devices in human-machine interfaces,medical health,sports entertainment,mechanical bones,and electronic skin,the research on flexible materials and wearable devices in recent years has attracted widespread attention.Flexible conductive film is the basic material for manufacturing wearable devices.It is not only used to build the flexible device itself,but also used to connect sensors,power supplies,antennas and other components,so as to be integrated into wearable devices with certain functions.Flexible devices require conductive thin film materials to have good conductivity and flexibility,and to maintain good mechanical-electrical stability during deformation,that is,the conductive performance remains stable under strain such as bending.Especially when fabricating wearable device that is close to the human skin,it is more necessary that the conductive film material can be stretched and twisted like the skin,and has a certain air permeability and good chemical stability and biological safety.In order to meet the performance requirements of flexible conductive films,it is an important research direction to fabricate metal conductive films with elastic structures by using micro-nano processing technology.This paper uses laser direct writing technology to develop a new method for fabricating metal micro-nano structure conductive films,studies the influence of structural parameters on the properties of conductive films,and fabricates skin-compatible conductive films with superior properties.In this paper,the technological path of a new type of laser direct-curing polymer is first studied,and the principle and characteristics of this technology are explored.Then,a reverse template is made by this method,and metal transparent conductive film with micro-nano mesh structure is fabricated by electrodeposition.On this basis,the effects of line width,metal deposition thickness and different metal types on the performance of metal grid conductive films were studied.By transferring this conductive film to a rigid glass substrate,the resulting nickel metal grid transparent conductive film has excellent conductivity and transparency,the light transmittance reaches 83%,and the sheet resistance is only 4.8 ?/sq.In addition,this article applies the fabricated metal conductive film to an electrothermal defrosting device and obtains superior electrothermal defrosting performance.The application prospect of flexible transparent conductive films is very wide,which also provides a new idea for the fabrication of transparent.In addition,in this paper,CAD designed graphics are used to make flexible stretchable metal mesh conductive films with micro-spring structures.The effects of different microstructures on the flexibility and stretchability of conductive films are studied.The experimental results show that by adjusting the parameters of the micro spring,a conductive film with good mechanical-electrical stability is fabricated.When the stretching exceeds 75%,the resistance change is only 5%,and when the number of bending times exceeds 5,000,the change of the square resistance is less than 2%.In addition,we have applied it to the fabrication of wearable electrothermal physiotherapy devices.At a voltage of 1.5 V,the device can be quickly heated to 50? in 10 s.The metal micro-spring flexible conductive film has wide application prospects in the field of wearable electronics.The laser direct writing assisted fabrication technology developed in this article is simple and effective,and provides a new technical path for the design and fabrication of metal micro-structure-based flexible conductive films.It will also greatly promote the development of flexible electronics and wearable devices. |
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