Rapid Transfer And Properties Of Large-area Graphene

Significant progress has been made in the preparation of large-scale graphene films,especially the technology of growing graphene on metal substrates using chemical vapor deposition is relatively mature,but graphene synthesized on metal substrates is difficult to use directly,and it needs to be transferred to the target substrate.However,the current graphene transfer technology is difficult to meet the needs of reliable and low-cost industrial production of graphene.In order to solve this problem,this thesis proposes a method for rapid transfer of graphene films assisted by polyethylene films,which can realize the efficient and low-cost transfer of large-area graphene films.In addition,this thesis studies the performance of graphene heating film made of graphene/polyethylene film,which expands the application scenarios of the rapid transfer method.This thesis also develops a method to evaluate the transferred graphene films,and evaluate the graphene transfer results from the aspects of integrity,defects,and electrical properties.The main research contents of this thesis are as follows:1.Polyethylene film quickly transfers graphene.The method of rapid transfer of graphene from polyethylene only uses van der Waals interaction to transfer a single layer of graphene directly to the polymer surface,without the use of intermediates,glue,electricity,vacuum,heat,pressure or other pretreatment,to achieve second-level graphene transfer,while avoiding the complete etching of copper foil to reduce the transfer cost.The method of rapid transfer of graphene by polyethylene film has completed the transfer goal of large-area,rapid,continuous,high-quality and low-cost graphene.2.Rapid transfer of low-surface resistance graphene.Using the van der Waals force between graphene,a multilayer graphene film is obtained through multiple transfers,reducing the overall resistance of the film.The average surface resistance of multilayer graphene/polyethylene film after three transfer superposition is 660 Ω/sq,which lays a foundation for the practical application of the method of rapid transfer of graphene in polyethylene film.3.Preparation of graphene heating film.The interdigital electrode was microprinted on the graphene/polyethylene film by silver paste to complete the preparation of the heating film.Graphene heating film has high transparency,thickness is only micron level,stable heating effect,heating temperature can reach 110 °C,is a flexible transparent heating film with good performance.4.Evaluation method of large-area graphene transfer.The integrity data of large-area graphene films were obtained by optical microscopic characterization and software calculation statistics,and it was found that the integrity and defect degree of large-area graphite films were strongly correlated with the electrical properties,especially the integrity played a crucial role in the advantages and disadvantages of electrical properties.