University of Illinois Urbana-Champaign

Large-scale growth, fluorination, clean transfer, and layering of graphene and related nanomaterials

Wood, Joshua

Content Files
Joshua_Wood.pdf

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https://hdl.handle.net/2142/46670

Description

Title
Large-scale growth, fluorination, clean transfer, and layering of graphene and related nanomaterials
Author(s)
Wood, Joshua
Issue Date
2014-01-16T17:58:32Z
Director of Research (if dissertation) or Advisor (if thesis)
  • Lyding, Joseph W.
  • Pop, Eric
Doctoral Committee Chair(s)
Lyding, Joseph W.
Committee Member(s)
  • Pop, Eric
  • Bashir, Rashid
  • Gruebele, Martin
  • Ravaioli, Umberto
Department of Study
Electrical and Computer Engineering
Discipline
Electrical and Computer Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Date of Ingest
2014-01-16T17:58:32Z
Keyword(s)
  • graphene
  • hexagonal boron nitride
  • transfer
  • synthesis
  • functionalization
  • fluorine
  • scanning tunneling microscopy
  • Raman spectroscopy
  • biomolecules
  • denaturation
  • layering
Abstract
This dissertation improves the synthesis, functionalization (i.e., fluorination), and transfer of graphene and hexagonal boron nitride (h-BN). Further, this document explores new avenues in the large-area, heterogeneous layering of graphene, h-BN, and related nanomaterials like nanoscale water and biomolecules. It is determined that monolayer, high-quality graphene growth by chemical vapor deposition (CVD) on Cu depends on the substrate’s crystallography, with few-defect, monolayer graphene growing on Cu(111). Functionalizing CVD graphene with XeF2 produces fluorinated graphene (FG) with C4F and CF stoichiometries. FG films seed high-κ HfO2 films better than pristine graphene. An atomically clean nanomaterial transfer method using poly(bisphenol A carbonate) (PC) is developed and benchmarked against alternative transfer scaffolds. A transferred CVD graphene overlayer encapsulates one to three nanoscale water layers on mica. The graphene shrink wrapped water is highly viscous and robust, withstanding ultra-high vacuum and high-temperature treatments. The PC transfer process is then used to shrink wrap heterogeneous combinations of graphene, h-BN, FG, water, CNTs, and biomolecules like tobacco mosaic viruses, proteins, and DNA. Biomolecules under graphene shrink wrap undergo pressure denaturation, affecting vicinal hydration. The water crystallizes at MBD-DNA complexes and spinodally dewets at pressure-denatured NA proteins on mica. Finally, the CVD growth of h-BN progresses from planar, large-grain films to amorphous, polymeric films as surface catalysis is suppressed and the growth pressure is increased. Also, the CVD h-BN films are thicker and more defective on high-index Cu facets versus low-index Cu(100).
Graduation Semester
2013-12
Permalink
http://hdl.handle.net/2142/46670
Copyright and License Information
Copyright 2013 Joshua Wood

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