Design Of Ultrasonic 3D Printer And Its Applications Of Large-size Patterned Transparent Conductive Film With Core-shell Cu Nanosilks

With the popularity of LCD TV,smart phone,tablet PC,touch screen,smart wearable and other optoelectronics products,transparent electrode,as an important part of optoelectronic devices,has always been an exploration topic.Due to the lack of indium resources,the price of ITO is too expensive,and the ITO is relatively fragile,which limits its application in flexible electronic devices.Recently,advanced transparent electrode materials,such as graphene,carbon nanotubes and metal nanowires,have been widely studied.Copper nanowire is regarded as an important candidate for the new generation of transparent electrodes due to its low cost and high performances.However,in the study of the process of copper nanowires,it still faces some challenges,such as oxidization in the air,and difficaulty in achieving large area manufacturation.This paper mainly focused on the anti-oxidation of copper nanowires and the setup of ultrasonic 3D printer for the preparation of large area transparent conductive films.Firstly,we proposed techniques of coating various types of shell on the copper nanosilks,including metal shell(silver),semiconductor shell(ZnO)and 2D material shell(graphene).For the silver shell,we put forward a one-pot encapsulation technique and found that the Cu@Ag nanosilks have good antioxidant ability and excellent conductivity.For the ZnO shell,a two step method was used to coating Zn metal shell,followed by oxidization with hydrogen peroxide.Besides antioxidation,the Cu@ZnO core-shell nanosilks showed semiconductor optoelectronic property.PLpeaks in the ultraviolet(390 nm)and visible light(450 nm)bands were observed.For the 2D material shell,we set up the CVD method to encapsulate graphene shell on the Cu nanosilks network.The Cu@graphene nanosilks exhibited strong antioxidant property and improved optoelectronic performances The results obtained in this work will provide very important scientific data for the application of transparent electrodes,and provide a great blueprint for future production industry.Secondly,we proposed the technology of ultrasonic 3D printer.According to the principle of "stacked stacking" of 3D printer,a 3D printer integrated with ultrasonic sprinkler is designed,and a rapid and large area of copper nanosilks transparent electrode is made.The spray of copper nanosilks with air pressure shock was achieved with optimized parameters.The spraying speed reached 2 m/min and the spray area could be larged than the A4 size.It could be applied to the preparation of large area and large batch of transparent conductive film.We also put forward the template method graphical spraying technology to realize the transparent electrode preparation of any required graphics or circuit.The transmittance of the conductive film prepared by the ultrasonic 3D spraying is similar to those made by the traditional vacuum pumping method.The technology of the ultrasonic 3D printer has successfully realized the rapid growth demand of the transparent electrode of the industrial nanosilks.Thirdly,we completed the development and application of copper nanosilks and their network structures on different kinds of new intelligent flexible electronic devices.(1)Thermochromic display.Because copper nanosilks have good electrothermal conversion efficiency,rapid thermal reaction speed and strong working stability,we use copper nanosilks to prepare electrothermal conductive film as the precursor,and develop the thermal color display instrument.Because of its simple production and low cost,it has a broad market in the future.(2)Flexible touch screen.Through the ultrasonic 3D printing technology,we made large area flexible conductive film,and constructed it into flexible touch screen with the graphic electrode and circuit.The touch writing and display was achieved.(3)Transparent blue LED.The transparent ohmic electrode on GaN is realized by Cu@Graphene nanosilks network.Through the APSYS simulations,the special tip-discharge injection mechanism was revealed for realizing ohmic contact.The complete LED was successfully lighted,and the excellent photoelectric performance was proved by the test.Obviously,copper nanosilks transparent electrodes occupy a very important position in various device fields,and have broad application prospects.