Substrate Effects on the Nanometer-Scale Mechanics of Gold Films.

Abstract

We have used interfacial force microscopy (IFM) and contact-mechanics analysis to quantitatively determine the deformation behavior and the mechanical properties of nanometer-size grains in polycrystalline Au films on various substrates. We evaluate these properties through an analysis of the loading-cycle curves and through a comparison of surface morphology before and after each nano-indention measurement by constant repulsive-force imaging. All the Au surfaces were coated with self-assembling monolayers of n-octadecanethiol to passivate the adhesive interaction between the tungsten probe and Au surfaces. Our results show that both the deformation behavior and mechanical properties vary strongly as a function of substrate and these variations are mirrored by changes in such factors as the interfacial adhesion, grain size and shape, and the presence of grain-boundary impurities. jg p.1

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Document Details

Document Type
Technical Report
Publication Date
Aug 18, 1995
Accession Number
ADA298317

Entities

People

  • J. E. Houston
  • P. Tangyunyong
  • R. C. Thomas
  • R. M. Crooks
  • T. A. Michalske

Organizations

  • Texas A&M University

Tags

Communities of Interest

  • Advanced Electronics
  • Sensors

DTIC Thesaurus Topics

  • Adhesion
  • Adhesives
  • Boundaries
  • Chemistry
  • Elastic Properties
  • Films
  • Grain Boundaries
  • Grain Size
  • Impurities
  • Materials
  • Measurement
  • Mechanical Properties
  • Mechanics
  • Microscopes
  • Modulus Of Elasticity
  • Shear Stresses
  • Surface Roughness

Fields of Study

  • Physics

Readers

  • Materials Science (Mechanical Engineering).
  • Nanocomposite Materials Science
  • Thin Film Deposition Science.