Journal
ACS NANO
Volume 10, Issue 2, Pages 2184-2192Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.5b06719
Keywords
carbon nanotube; graphene oxide; bioinspired; artificial bone; mechanical properties; stress-transfer
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The self-assembled nanostructures of carbon nanomaterials possess a damage-tolerable architecture crucial for the inherent mechanical properties at both micro- and macroscopic levels. Bone, or natural composite, has been known to have superior energy dissipation and fracture resistance abilities due to its unique load-bearing hybrid structure. However, few approaches have emulated the desirable structure using carbon nanomaterials. In this paper, we present an approach in fabricating a hybrid composite paper based on graphene oxide (GO) and carbon nanotube (CNT) that mimicks the natural bone structure. The size-tuning strategy enables smaller GO sheets to have more cross-linking reactions with CNTs and be homogeneously incorporated into CNT-assembled paper, which is advantageous for effective stress transfer. The resultant hybrid composite film has enhanced mechanical strength, modulus, toughness, and even electrical conductivity compared to previously reported CNT-GO based composites. We further demonstrate the usefulness of the size-tuned GOs as the stress transfer medium by performing in situ Raman spectroscopy during the tensile test.
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