9 May 2005 Nondestructive mechanical imaging of carbon nanotubes
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Differential ultrasonic force microscopy (d-UFM) has been used to investigate the nanoscale mechanical response of multi-walled carbon nanotubes (MWNTs) synthesized via chemical vapor deposition (CVD). In contrast to earlier studies, MWNTs with relatively high numbers (~ 60) of concentric walls were investigated. Quantitative analysis of the MWNT d-UFM data utilized Si3N4 cantilevered tips and Si substrates as a calibration standard. Initial investigations of the CVD MWNTs through d-UFM revealed a surprisingly large radial indentation modulus compared to Si. Frictional force imaging (FFM) was also carried out on the MWNTs in the presence and absence of an ultrasonic vibration. A FFM contrast reversal was observed between the MWNT and the Si substrate as the static set point force of the AFM cantilever was increased. This is attributed to an increase in the local indentation of the MWNT by the Si3N4 tip.
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Yuegui Zheng, Yuegui Zheng, Balasubramanian Sankaran, Balasubramanian Sankaran, Robert Geer, Robert Geer, } "Nondestructive mechanical imaging of carbon nanotubes", Proc. SPIE 5766, Testing, Reliability, and Application of Micro- and Nano-Material Systems III, (9 May 2005); doi: 10.1117/12.600349; https://doi.org/10.1117/12.600349

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