Nondestructive mechanical imaging of SnO2 nanobelts

Yuegui Zheng; Robert E. Geer

doi:10.1117/12.540411

21 July 2004 Nondestructive mechanical imaging of SnO₂ nanobelts

Yuegui Zheng, Robert E. Geer

Author Affiliations +

Proceedings Volume 5392, Testing, Reliability, and Application of Micro- and Nano-Material Systems II; (2004) https://doi.org/10.1117/12.540411
Event: NDE for Health Monitoring and Diagnostics, 2004, San Diego, CA, United States

Abstract

The relative surface contact stiffness of SnO₂ nanobelts has been investigated via nondestructive ultrasonic force microscopy (UFM). The nanobelt crystal structure, as determined via transmission electron microscopy, was indexed to the tetragonal rutile structure (with lattice constants identical to those of bulk SnO₂) as reported previously. The atomic Sn:O composition of the nanobelts studied was at or near 1:2. Topographic imaging studies revealed the nanobelt surface to be atomically flat with the exception of surface nano-dots, assumed to be local SnO₂ crystallites. Preliminary local (10nm x 10nm) reduced modulus measurements were carried out via differential UFM on both the flat and nanodot regions of the nanobelt. Using the underlying Si substrate as a calibration standard the SnO₂ modulus was estimated at 157±12 GPa, significantly lower than corresponding bulk values for any of the observed crystal orientations. We speculate this discrepancy is due in part to a combination of the aspherical probe tip and unknown adhesive properties of nanobelt, although an intrinsic reduction of the SnO₂ nanobelt modulus cannot be ruled out.

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Yuegui Zheng and Robert E. Geer "Nondestructive mechanical imaging of SnO₂ nanobelts", Proc. SPIE 5392, Testing, Reliability, and Application of Micro- and Nano-Material Systems II, (21 July 2004); https://doi.org/10.1117/12.540411

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