| AVS 54th International Symposium | |
| Nanometer-scale Science and Technology | Thursday Sessions |
| Session NS-ThP |
| Session: | Nanometer-Scale Science & Techology Poster Session II |
| Presenter: | C. Varanasi, University of Dayton Research Institute |
| Authors: | C. Varanasi, University of Dayton Research Institute J. Bulmer, AFRL/PRPG, WPAFB M. Mullins, AFRL/PRPG, WPAFB J. Burke, University of Dayton Research Institute J. Baca, AFRL/PRPG, WPAFB L. Brunke, University of Dayton Research Institute K. Yost, AFRL/PRPG, WPAFB P. Barnes, AFRL/PRPG, WPAFB |
| Correspondent: | Click to Email |
One of the common methods used to grow aligned CNTs on various substrates is chemical vapor deposition (CVD) using C2H2 or CH4 as precursors. In this process, the substrates are processed prior to CVD such that metallic nanoparticles such as Fe, Ni etc. are formed on the surfaces to act as catalysts during the CVD process. However, the adhesion of CNTs to the substrates has been a problem in this approach as the nanoparticles are not integrated in to the substrate. In this study, biaxially textured Ni based alloy substrates were investigated as an alternate choice of substrates where the catalyst forms an integral part of the substrate to reduce the problem of adhesion of CNTs to the substrate. A biaxially textured Ni based substrate offers a surface with a well oriented grain structure (offering uniform growth) and the defects, grain boundaries, and the precipitates of the alloying additions etc., in the materials provide the necessary nucleation sites for the CNT growth. In the present work, several biaxially textured Ni alloy based metallic substrates were investigated to grow CNTs without giving any prior catalyst treatment to the substrates. A very high density of the CNT growth was observed on these substrates when suitable conditions were used using a CVD process with C2H2 as a carbon source. In the present talk, the experimental details to prepare the textured metallic substrates and CVD growth conditions used to grow the CNTs will be discussed. In addition, the characterization of textured substrates and CNTs grown on these substrates by using various characterization tools such as orientation image microscopy, Raman spectroscopy, TEM, and SEM will be presented.