Preparation And Applications Of Cellulose-based Conductive Paper

The invention and use of paper is a major advance in human civilization.Cellulose paper,which is rich in sources,low-cost and renewable,is an important carrier of human civilization,greatly promoting the exchange,inheritance and development of knowledge and technology.Paper is also an important fiber-based porous material.It not only has the advantages of flexibility,low cost,wide source,and environmental friendliness,but also has special surface chemistry and material structure.It can be combined with other functional materials and applied in energy,separation,adsorption and other fields,greatly improving the comprehensive performance and sustainability of technologies and products.In recent decades,the development of the modern electronics industry has brought great changes to the human society,but also generated a large amount of electronic waste,bringing more and more pressure to the environment.Therefore,the development of inexpensive,flexible,and sustainable paper-based electronic products and devices has become an important direction.In particular,conductive materials based on cellulose and cellulose paper have attracted the attention of researchers due to their wide application prospects in the field of multiple functional materials.This paper aims to develop high performance conductive paper and paper-based conductive materials.Based on the interaction between cellulose fiber and active substances,the large-scale production technology of cellulose based conductive paper is studied on the basis of traditional papermaking technology.The main research contents are as follow:(1)Softwood fiber and bacterial cellulose fiber were used as matrix,silver nano-particles(Ag NPs)are generated in situ on the fiber surface by silver mirror reaction to obtain conductive fiber.The growth mechanism of Ag NPs on different sizes of fiber surface and its effect on fiber properties were preliminarily investigated,and the application of conductive Ag NPs/cellulose fiber was further explored.Conductive bacterial cellulose fiber can be mixed with acrylamide as a strength additive and conductive additive to prepare a composite conductive hydrogel that can be repeatedly stretched.It has good application potential and broad application in tensile strain sensing and human motion sensing.(2)A simple,effective,low cost and scalable method was use to prepare graphene oxide(GO)/cellulose paper.In the prepared composite paper,under the action of cationic polyacrylamide,the graphene oxide nanosheets were assembled to the surface of the cellulose fibers and uniformly distributed in the fibrous matrix,thereby obtaining excellent mechanical properties and barrier properties.Further,the reduced graphene oxide(RGO)/cellulose paper having good conductivity by the subsequent reduction by ascorbic acid.The mechanism of cationic polyacrylamide and the influence of different papermaking methods on the properties of composite paper were investigated.The effects of graphene content on the mechanical properties,barrier properties and electrical conductivity of composite paper were studied.The application of conductive paper in electrochemistry was also explored.(3)Ag NPs/graphene/cellulose paper was obtained by mixing Ag NPs/cellulose fibers and graphene oxide/cellulose fibers by a wet paper forming technique.Among the paper-based electrodes,Ag NPs/cellulose fibers act as a flexible three-dimensional current collector,ensuring a fast charge and discharge process.Graphene cellulose fibers and Ag NPs/cellulose fibers can be tightly bonded by hydrogen bonding and van der Waals force.It can be used as self-independent adhesive-free electrodes.Then the application of composite paper in flexible all-solid supercapacitor was studied.The effects of Ag NPs,graphene and cellulose fibers on the flexibility,mechanical properties and electrochemical properties of supercapacitors were investigated,and the effects of rapid dehydration of cellulose and water absorption on capacitance were explored.(4)Polypropylene film and printing paper were used to fabricate a composite paper by hot pressing,having better surface properties and mechanical properties than paper and plastic.Based on the composite paper,we developed a method of spin-coating silver mirror reaction,which solves the problem of forming large particles in the traditional silver mirror reaction by adjusting the reaction layer of the silver mirror reaction,and finally obtains high conductivity,reflection,and surface roughness.The composite paper has strong shielding ability for moisture and chemical solvents,while retaining the characteristics of ordinary cellulose paper,such as light weight,flexibility and foldability.Its good performance,low cost and simple preparation method make it suitable for flexible electronic products.The application of the silver-paper in organic solar cells(OSC)and organic light-emitting diodes(OLED)is preliminary explored.