Fabrication Of Flexible Metal Micro/nano-surface Structures By Transfer Printing And Its Technical Methods

New functional materials, fabricated with metal micro/nano-surface structures, could be widely used in rising areas such as flat panel display,new energy sources,sensors and so on.Conventional metal patterning methods require severe high temperature,chemical etching,physical etching or other processes which are difficult to apply on flexible substrate. So metal transfer printing proves to be a perfect choice for fabricating flexible metal micro/nano devices.The procedure of metal transfer printing is: first,fabricate target pattern mold through conventional micro/nano fabricating technology; then,fabricate flexible mold through nano-imprinting,and deposit metallic layer on it,which makes the carrier; contact the carrier and the receiver under certain conditions for a while; at last separate them. As a result,metal layer on the raised part could be transferred onto the receiver substrate selectively.Polymers with thiol end could form chemical bonds with metals,and these bonds could be applied to the transfer printing of metal pattern. Based on this basic theory, a new simple metal transfer printing method was proposed in this paper:method of metal transfer printing based on thiol group modified surface. The key point is the surface modification of receiver substrate,on which a layer of self-assembled molecular was fabricated by immersing in the solution which contains thiol groups. This method is with high efficiency,few procedures and has potential application for mass production.The anaerobic UV curing adhesion(a-UV) is of dual curing conditions,which highlights among many adhesives. Inspired by the perfect characteristic of a-UV, a new metal transfer printing method based on a-UV is given in this paper. The key point is the coating thickness of the a-UV,which could create anaerobic and aerobic conditions during the transfer printing process. And these two conditions lead to the selective transfer of metal layer. Two different ways of metal transfer printing, embedded pattern and captured pattern, based on a-UV are explored. Experimental results show that the methods could be applied to metal transfer printing. And the metal patterns have different distribution on thesubstrate surface,which has good inspiration on research.