Time Evolution of the Wettability of Supported Graphene under Ambient Air Exposure.

ABSTRACT: The wettability of graphene is both fundamental and crucial for interfacing in most applications, but a detailed understanding of its time evolution remains elusive. Here we systematically investigate the wettability of metal-supported, chemical vapor deposited graphene films as a function of ambient air exposure time using water and various other test liquids with widely different surface tensions. The wettability of graphene is not constant, but varies with substrate interactions and air exposure time. The substrate interactions affect the initial graphene wettability, where, for instance, water contact angles of ∼85 and ∼61° were measured for Ni and Cu supported graphene, respectively, after just minutes of air exposure. Analysis of the surface free energy components indicates that the

SUBMITTER: Aria AI 

PROVIDER: S-EPMC4754094 | biostudies-literature | 2016 Feb

REPOSITORIES: biostudies-literature