Scalable Fabrication and Thermo-Electro-Mechanical Characterization of 3D Architected Graphene Lattices from Additively-Manufactured Polymer Templates

  • Juveiriah Ashraf

Student thesis: Master's Thesis

Abstract

In order to benefit from the novel properties of graphene in engineering applications today, synthesizing free-standing, three-dimensional (3D) graphene is essential. However, most processes used till date still suffer from scalability, architecture-versatility and pore-size control. In this project, a novel, facile, and scalable synthesis method for specially designed 3D graphene lattices has been developed using additively-manufactured polymer-based triply periodic minimal surface (TPMS) as the initial sacrificial template. Cubically symmetric structured of the polymer Gyroid were dip-coated with graphene oxide (GO) solution using the self-assembly assisted hydrothermal method followed by thermal etching of the polymer scaffold to reveal pure 3D graphene structures. Scanning electron microscopy (SEM) and micro computed tomography (micro-CT) scan were used to evaluate the morphology and size of the 3D graphene architectures while a Raman response at 1359 cm-1 (D peak), 1604 cm-1 (G peak) and 2699 cm-1 (2D peak) verified presence of reduced graphene oxide (rGO). The 3D graphene structures exhibited a Young's modulus of 351 kPa for a sample with a near ultra-low density of 45.9 mg cm-3. High thermal insulation was also recorded with a thermal conductivity of 6.9 W m-1 K-1 along with an appreciable electrical conductivity of 0.11 S m-1 at a volume fraction of only 6%.
Date of AwardDec 2019
Original languageAmerican English

Keywords

  • 3D graphene lattices
  • triply periodic minimal surface
  • additive manufacturing
  • stereolithography

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