Growth of high-quality carbon nanotubes on free-standing diamond substrates |
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Authors: | C Varanasi J Petry BT Yang J Burke JS Bulmer PN Barnes |
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Affiliation: | a University of Dayton Research Institute (UDRI), Dayton, OH 45469, USA b Innovative Scientific Solutions, Inc., Dayton, OH 45440, USA c Texas A&M University, College Station, TX 77843, USA d Air Force Research Laboratory (AFRL), WPAFB, OH 45433, USA e Army Research Office, Research Triangle Park, NC 27709, USA |
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Abstract: | Carbon nanotubes (CNTs) were grown on diamond-coated Si substrates and free-standing diamond wafers to develop efficient thermal interface materials for thermal management applications. High-quality, translucent, free-standing diamond substrates were processed in a 5 kW microwave plasma chemical vapor deposition (CVD) system using CH4 as precursor. Ni and Ni-9%W-1.5%Fe catalyst islands were deposited to nucleate CNTs directly onto the diamond substrates. Randomly-oriented multi-walled CNTs forming a mat of ∼5 μm thickness and consisting of ∼20 nm diameter tubes were observed to grow in a thermal CVD system using C2H2 as precursor. Transmission electron microscopy and Raman analyses confirmed the presence of high-quality CNTs on diamond showing a D/G peak ratio of 0.2-0.3 in Raman spectra. |
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