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Title: Modifying the chemistry of graphene with substrate selection: A study of gold nanoparticle formation

Graphene and metal nanoparticle composites are a promising class of materials with unique electronic, optical, and chemical properties. In this work, graphene is used as a reducing surface to grow gold nanoparticles out of solution-based metal precursors. The nanoparticle formation is found to strongly depend upon the graphene substrate selection. The studied substrates include diamond, p-type silicon, aluminum oxide, lithium niobate, and copper. Our results indicate that the chemical properties of graphene depend upon this selection. For example, for the same reaction times and concentration, the reduction of gold chloride to gold nanoparticles on graphene/lithium niobate results in 3% nanoparticle coverage compared to 20% coverage on graphene/silicon and 60% on graphene/copper. On insulators, nanoparticles preferentially form on folds and edges. Energy dispersive X-ray analysis is used to confirm the nanoparticle elemental makeup.
Authors:
; ;  [1]
  1. Department of Physics, Arizona State University, Tempe, Arizona 85281 (United States)
Publication Date:
OSTI Identifier:
22398782
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 12; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 77 NANOSCIENCE AND NANOTECHNOLOGY; ALUMINIUM OXIDES; CHEMICAL PROPERTIES; COMPARATIVE EVALUATIONS; CONCENTRATION RATIO; COPPER; DIAMONDS; GOLD; GOLD CHLORIDES; GRAPHENE; LITHIUM COMPOUNDS; NANOCOMPOSITES; NANOPARTICLES; NIOBATES; SILICON; SUBSTRATES; SURFACES; X RADIATION