World’s First Successful Measurement of Strength of Boron Nitride Nanotubes
This research was conducted by
Xianlong Wei & Dmitri Golberg
Xianlong Wei & Dmitri Golberg
The world first nano-tensile tests on individual multi-walled boron nitride nanotubes, only 10-50 nanometers across and several hundred nanometers long, under direct loading and imaging in a transmission electron microscope, were performed; these revealed the ultimate tensile strength of ~33 GPa, a ~15 times increase compared to the highest-strength steel.
Figure 1: (Left) Experimental image of an individual multi-walled boron nitride nanotube (BNNT) clamped between an AFM cantilever (left-hand-side contact) and a tungsten nanowire (right-hand-side contact) under a tensile test in the transmission electron microscope. The inset is a high-resolution image of the tube. The arrow shows the direction of the tungsten tip retraction; (Right) A measured true stress-strain curve (data points) of BNNTs corresponding to its ultimate tensile strength of ~33 GPa and the Young’s modulus of ~900 GPa.
