Grain boundary-free graphene sheets for better electrical transport properties prepared by an electrochemical method

Abstract

Abstract Though good qualities of graphene have been prepared by the electrochemical method, the quality in terms of grain boundaries which has a consequential impact on its electrical properties has not yet been investigated in detail. In this work, grain boundaries and their electrical properties in graphene prepared by the electrochemical method have been investigated. The grain boundary in graphene has been examined from images obtained by a high-resolution transmission electron microscope. The finding reveals no grain boundaries in the graphene sheet prepared by the electrochemical method. As a result, a high current value has been obtained which may be attributed to the smooth passage of charge careers due to the absence of grain boundaries in graphene. The finding suggests that the prepared graphene sheets using the above-mentioned method are excellent in qualities that can be potentially used in various electronic devices, such as field-effect transistors, solar cells, transparent electrodes, interconnects, etc.