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Increasing the stiffness of SWCNT bucky paper by heavy ion irradiation

Journal:
AIP Conference Proceedings


Issue Date:
2007


Abstract(summary):

We verify simulation results indicating that carbon ion irradiation increases the stiffness of single wall carbon nanotube bucky paper (SWCNT). 4 MHz longitudinal and 15 MHz shear ultrasonic signals were transmitted by means of dry-coupled acoustic horns through 40plusmn4 mum thick samples and the time-of-flight (TOF) through the samples was measured. From the TOF the velocity of the wave was determined and the out-of-plane elastic and shear moduli were calculated. The nonlinearity parameter B/A for the irradiated and reference sample was measured. The results indicated a significant increase both in the shear modulus (90 %) and in the longitudinal modulus (69 %) for certain irradiation doses as predicted by simulations. In addition, a 36% increase in the acoustic nonlinearity parameter (B/A) was observed. The investigated fluence range was 1middot10 13 to 3middot10 14 cm -2


Page:
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