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Residual Stress Distribution, Intermolecular Force, And Frictional Coefficient Maps In Diamond Films: Processing-Structure-Mechanical Property Relationship

Published online by Cambridge University Press:  26 February 2011

Sanju Gupta
Affiliation:, University of Missouri-Columbia, Electrical and Computer Engineering, 6th St. 303 EBW, Columbia, MO, 65211-2300, United States, 57388200948, 5738820397
Oliver Williams
Affiliation:, Institute of Materials Research, Diepenbeek, BE-3590, Belgium
R. J. Patel
Affiliation:, Missouri State University, Physics and Materials Science Department, 901 S. National Ave., Springfield, MO, 65987, United States
E. Bohannan
Affiliation:, University of Missouri-Rolla, Department of Chemistry, Rolla, MO, 65409, United States
P. W. May
Affiliation:, University of Bristol, School of Chemistry, Bristol, BS8 1TS, United Kingdom
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Carbon in its various forms, specifically nanocrystalline diamond, may become a key material for the manufacturing of micro- and nano-electromechanical (M/NEMS) devices in the 21st Century. In order to utilize effectively these materials for M/NEMS applications, understanding of their microscopic structure and physical (mechanical properties, in particular) become indispensable. The micro- and nanocrystalline diamond films were grown using hot-filament and microwave chemical vapor deposition techniques involving novel CH4 / [TMB for boron doping and H2S for sulfur incorporation] in high hydrogen dilution chemistry. To investigate residual stress distribution and intermolecular forces at nanoscale, the films were characterized using Raman spectroscopy and atomic force microscopy in terms of topography, force curves and force volume imaging. Traditional force curve measures the force felt by the tip as it approaches and retracts from a point on the sample surface, while force volume is an array of force curves over an extended range of sample area. Moreover, detailed microscale structural studies are able to demonstrate that the carbon bonding configuration (sp2 versus sp3 hybridization) and surface chemical termination in both the un-doped and doped diamond have a strong effect on nanoscale intermolecular forces. The preliminary information in the force volume measurement was decoupled from topographic data to offer new insights into the materials's

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Copyright © Materials Research Society 2007

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