Abstract by Evan Dodson
Physics and Astronomy
Optimizing Carbon Nanotube Growth for Circuit Transfer
Carbon nanotubes (CNTs) are a promising material for use in electrode manufacture for human use due to their good conductance and inert nature. In this, CNTs must be removed and transferred onto a circuit and handle application stresses, making adhesion to substrate and strength important growth parameters. CNTs were grown in a chemical vapor deposition furnace with lateral dimensions from 40μm to 5000μm and infiltrated with carbon ranging from 850 - 900 C for 5 - 360 min. To test adhesion, they were subjected to a series of increasingly aggressive qualitative tests attempting to remove them from the substrate. Strength was tested through 3-point bending. It was found that over the range of sizes tested, infiltration at 850 C produced CNTs that adhered before a O2 plasma etch while 900 C infiltration adhered even after an O2 etch. CNTs that were more square generally had better adhesion strength. Strength does not seem to vary between each temperature's maximal infiltration time.