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Title: Graphene thickness dependent adhesion force and its correlation to surface roughness

In this paper, adhesion force of graphene layers on 300 nm silicon oxide is studied. A simple model for measuring adhesion force for a flat surface with sub-nanometer roughness was developed and is shown that small surface roughness decreases adhesion force while large roughness results in an effectively larger adhesion forces. We also show that surface roughness over scales comparable to the tip radius increase by nearly a factor of two, the effective adhesion force measured by the atomic force microscopy. Thus, we demonstrate that surface roughness is an important parameter that should be taken into account in analyzing the adhesion force measurement results.
Authors:
 [1] ;  [1] ;  [2]
  1. Electrical and Computer Engineering, University of Utah, Salt Lake City, Utah 84112 (United States)
  2. (United States)
Publication Date:
OSTI Identifier:
22267741
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 17; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ADHESION; GRAPHENE; LAYERS; ROUGHNESS; SILICON OXIDES; SURFACES; THICKNESS