Abstract by RJ Cass
Physics and Astronomy
Determining the Material Properties of Carbon Nanotube Structures Through Cantilever Resonances
Carbon Nanotube Templated Microfabrication (CNT-M) processes use nanotube forest growth from a 2-D pattern to form 3-D structures. The resulting structure is infiltrated with a second material to form the final device. The Young’s Modulus and Ultimate Strength of these structures will vary with the degree of infiltration.
A standard method of 3-point bending can be used to determine the Ultimate Strength, Young’s Modulus, and Maximum Strain of CNT-M structures infiltrated with many materials. However, in the case of tungsten ALD infiltration on typical test beams, the infiltration was not sufficiently uniform for high confidence results. The beams with smaller widths, required for uniform infiltration, are difficult to handle for 3-point bending. A new approach based on resonance frequencies and using a Laser Doppler Vibrometer (LDV) is being explored that may work on smaller beams. Testing on larger carbon-infiltrated CNT structures we found their Young’s Modulus to be 13.344 GPa.