(562e) Wetting Transparency of Single-Layer Graphene on Liquid Substrate

The wetting transparency of graphene provides tremendous opportunities for designing multi-functional devices in which the wettability of an atomic-thick film can be tuned by selecting an appropriate supporting substrate. This picture becomes even more appealing when the substrate is liquid. Nevertheless, the underlying mechanism of the graphene wetting transparency is still under debate. Understanding the mechanisms of wetting transparency of graphene on liquid substrates and demonstrating the real-time control of surface wettability would be crucial to fundamental understanding and many applications. Meanwhile, it is challenging to study the wetting transparency of graphene on liquid substrate experimentally. Here we have developed an experimental method based on contact angle measurement tests to characterize the wetting transparency of single-layer graphene on liquid substrate. This method not only enable us to investigate the wetting transparency of single-layer graphene but can also apply to other types of 2D materials.