SIZE-DEPENDENT ELASTIC PROPERTIES OF NANOFILAMENTS

 

G. Stan1), R. F. Cook1), S. Krylyuk2), A. V. Davydov2), and G. T. Wang3)

 

1) Ceramics Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.

2) Metallurgy Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.

3) Advanced Materials Sciences, Department 1126, Sandia National Laboratories, Albuquerque, NM 87185, USA.

 

 

To enable advanced functionality and performance of new nanoscale devices, accurate knowledge of material properties at the nanoscale is a critical requirement. One class of potential building blocks for nanoscale integrated circuits and devices is that of nanofilaments: nanowires and nanotubes, for example. Consequently, quantification and understanding of the mechanical properties of nanofilaments is an ongoing investigation. In various types of measurements, elastic moduli of nanofilaments have been observed to exhibit peculiar behavior depending on material, size, and shape. By using contact resonance atomic force microscopy (CR-AFM) we have systematically investigated the size-dependence of the radial and tangential elastic moduli of some semiconductor nanofilaments: ZnO nanowires, Te nanowires, and AlN nanotubes. With well-defined probe-sample contact geometry, the technique facilitates in situ elastic property characterization of nanofilaments used as substrate-supported components in functional nanodevices. To assure great accuracy and reproducibility in our measurements, all the quantified values of the measured elastic moduli are traceable back to the elastic constants of Si. Enhancements in the measured elastic moduli have been observed consistently for the investigated nanofilaments. These enhancements are associated with a surface stiffness effect that is manifested in nanostructures with large surface-to-volume ratios.

 

 

Author Informations:

Name:                         † Gheorghe Stan

Mentorís name:            Robert F. Cook

Division:                       Ceramics, 852

Laboratory:                 † MSEL

Room/Building: †††††††† ††B107/217

Mail Stop:                   † 8526

Telephone #:                 301-975-3675

Fax #:††††††††††††††††††††††††† † 301-975-5995

Email:                           gheorghe.stan@nist.gov

Sigma Xi:                      not a member

Category:                    †† Materials