Measurement of Poisson’s ratio with contact-resonance atomic force microscopy

Authors

D.C. Hurley, Materials Reliability Division, National Institute of Standards & Technology, Boulder, CO
Joseph A. Turner, University of Nebraska - LincolnFollow

Date of this Version

August 2007

Comments

Published in JOURNAL OF APPLIED PHYSICS 102, 033509 2007. © 2007 American Institute of Physics. Used by permission.

Abstract

We describe contact-resonance atomic force microscopy (AFM) methods to quantitatively measure Poisson’s ratio ν or shear modulus G at the same time as Young’s modulus E. In contact-resonance AFM, the frequencies of the cantilever’s resonant vibrations are measured while the tip is in contact with the sample. Simultaneous measurement of flexural and torsional vibrational modes enables E and ν to be determined separately. Analysis methods are presented to relate the contact-resonance frequencies to the tip-sample contact stiffness, which in turn determines the sample’s nanoscale elastic properties. Experimental results are presented for a glass specimen with fused silica used as a reference material. The agreement between our contact-resonance AFM measurements and values obtained from other means demonstrates the validity of the basic method.