Accession Number:

AD1018779

Title:

Plasticity and Ductility in Graphene Oxide Through a Mechanochemically Induced Damage Tolerance Mechanism

Descriptive Note:

Journal Article

Corporate Author:

Northwestern University Evanston Campus Evanston United States

Report Date:

2015-08-20

Pagination or Media Count:

11.0

Abstract:

The ability to bias chemical reaction pathways is a fundamental goal for chemists and material scientists to produce innovative materials. Recently, two-dimensional materials have emerged as potential platforms for exploring novel mechanically activated chemical reactions. Here we report a mechanochemical phenomenon in graphene oxide membranes, covalent epoxide-to-ether functional group transformations that deviate from epoxide ring-opening reactions, discovered through nanomechanical experiments and density functional-based tight binding calculations. These mechanochemical transformations in a two-dimensional system are directionally dependent, and confer pronounced plasticity and damage tolerance to graphene oxide monolayers. Additional experiments on chemically modified grapheme oxide membranes, with ring-opened epoxide groups, verify this unique deformation mechanism. These studies establish graphene oxide as a two-dimensional building block with highly tuneable mechanical properties for the design of high-performance nanocomposites, and stimulate the discovery of new bond-selective chemical transformations in two-dimensional materials.

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE