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

Wood, Joshua

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

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

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

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

Copyright and License Information

Copyright 2013 Joshua Wood

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