1. Raman Analysis of Hard Carbon Films
Christopher Torres
November 16, 2007

2. Motivation Carbon Exhibits Several Structural Forms
Diamond
Graphite
Lonsdaleite
C60 (Buckyball)
C540
C70
Amorphous Carbon
Carbon Nanotube
Diamond – Thin Film
High Hardness ~90 GPa
Low Coefficient of Friction ~0.01
Chemically Inert
Diamond Structure
Carbon Allotropes

3. Characterization Carbon Film Mechanical Properties
Bonding Structure
Sp2
Sp3
Chemical Impurities
Defects
Carbon Structures are Strong Raman Scatters
Phonon Crystal Vibrations
Sensitive Graphite Structure
Raman Signal Changes using Different Light Energies