title: Ultrastrong, Chemically Resistant Reduced Graphene Oxide-based Multilayer Thin Films with Damage Detection Capability.
abstract: Multilayer thin films of graphene oxide (GO) and poly(vinylamine) (PVAm) were deposited via layer-by-layer assembly. Poly(vinylamine) pH was used to tailor film thickness and GO layer spacing. Graphene oxide concentration in the films was controlled through simple pH adjustment. Thermal reduction of the PVAm/GO multilayer thin films rendered them electrically conductive, which could be further tailored with PVAm pH. These reduced films also exhibited exceptionally high elastic modulus of 30 GPa and hardness of 1.8 GPa, which are among the highest of any graphene-filled polymer composite values ever reported. Cross-linking of these films with glutaraldehyde improved their chemical resistance, allowing them to survive strongly acidic or salty solutions. Additionally, scratches in the films can be instantaneously detected by a simple electrical resistance measurement. These films are promising for a variety of packaging and electronic applications.
authors.affiliation: Department of Mechanical Engineering, Texas A&M University , College Station, Texas 77843-3123, United States.
authors.forename: Tyler
authors.initials: T
authors.lastname: Guin
authors.affiliation: Department of Mechanical Engineering, Texas A&M University , College Station, Texas 77843-3123, United States.
authors.forename: Bart
authors.initials: B
authors.lastname: Stevens
authors.affiliation: Department of Mechanical Engineering, Texas A&M University , College Station, Texas 77843-3123, United States.
authors.forename: Michelle
authors.initials: M
authors.lastname: Krecker
authors.affiliation: Department of Mechanical Engineering, Texas A&M University , College Station, Texas 77843-3123, United States.
authors.forename: John
authors.initials: J
authors.lastname: D'Angelo
authors.affiliation: Department of Mechanical Engineering, Texas A&M University , College Station, Texas 77843-3123, United States.
authors.forename: Mohammad
authors.initials: M
authors.lastname: Humood
authors.affiliation: Department of Materials Science and Engineering, Texas A&M University , College Station, Texas 77843-3003, United States.
authors.forename: Yixuan
authors.initials: Y
authors.lastname: Song
authors.affiliation: Department of Chemistry, Texas A&M University , College Station, Texas 77843-3012, United States.
authors.forename: Ryan
authors.initials: R
authors.lastname: Smith
authors.affiliation: Department of Mechanical Engineering, Texas A&M University , College Station, Texas 77843-3123, United States.
authors.forename: Andreas
authors.initials: A
authors.lastname: Polycarpou
authors.affiliation: Department of Mechanical Engineering, Texas A&M University , College Station, Texas 77843-3123, United States.|Department of Materials Science and Engineering, Texas A&M University , College Station, Texas 77843-3003, United States.|Department of Chemistry, Texas A&M University , College Station, Texas 77843-3012, United States.
authors.forename: Jaime C
authors.initials: JC
authors.lastname: Grunlan
keywords: cross-linking; layer-by-layer assembly; nanoindentation; poly(vinylamine); reduced graphene oxide