Formation of three-dimensional graphene structures by controlled thermal activation of polymeric shape memory substrates

Wang, Cai Mike

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https://hdl.handle.net/2142/50419 Copy

Description

Title

Formation of three-dimensional graphene structures by controlled thermal activation of polymeric shape memory substrates

Author(s)

Wang, Cai Mike

Issue Date

2014-09-16

Director of Research (if dissertation) or Advisor (if thesis)

Nam, SungWoo

Department of Study

Mechanical Sci & Engineering

Discipline

Mechanical Engineering

Degree Granting Institution

University of Illinois at Urbana-Champaign

Degree Name

M.S.

Degree Level

Thesis

Keyword(s)

• graphene
• graphite
• shape memory polymer
• polystyrene
• Shrinky-Dinks
• graphene-polymer composites
• strain engineering
• 2D nano-materials
• low dimensional nano-materials
• atomic force microscopy (AFM)
• Raman spectroscopy
• surface enhanced Raman spectroscopy (SERS)
• near-field scanning optical microscopy (NSOM)
• plasmonics
• graphene devices
• flexible devices
• bio-sensors
• cell morphology
• cell registry
• Infrared (IR)
• thermal treatment
• chemical vapour deposition (CVD)
• graphene synthesis
• graphene transfer
• crumples
• corrugations
• wrinkles
• folds
• buckles
• ripples
• surface relief grating
• lithography-free patterning
• soft materials

Abstract

This thesis details methodologies for a single-step approach to realise heterogeneous, three-dimensional (3D) texturing of graphene and graphite by using thermally-activated shape-memory polymers as the underlying substrate and the material characterizations thereof. Uniform, large area arrays of textured 3D graphene crumple features can be created on the centimeter scale by controlling simple processing parameters without compromising graphene’s superior mechanical, electrical, and optical properties. In addition, the capability to deterministically pattern graphene and graphite crumples in a spatially selective manner from otherwise flat graphene/graphite is achieved via infrared activation, which has not been previously possible with other methods such as relaxation of mechanically pre-strained elastomers, contraction of solvent swollen hydrogels, or thermal expansion mismatch between the surface film and substrate. The proposed methods will enable facile large-scale topographical and strain engineering of not only graphene and graphite but also other low-dimensional, thin-film and 2D materials such as transitional metal dichalcogenides and furthermore provide a pathway to realizing 3D all carbon-based devices and sensors.

Graduation Semester

2014-08

Permalink

http://hdl.handle.net/2142/50419

Copyright and License Information

Copyright 2014 Cai Mike Wang

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