Duchuan Shi has been a PhD candidate since 2008. His research is focused on carbon nanotube synthesis (chirality, diameter and/or orientation control), characterization (TEM, SEM, AFM, Raman, etc.) and applications (field emission, electrode, etc.). Before joining the current program, he was a graduate student at the Chinese Academy of Sciences (Beijing, China). He received his B.S. degree from Xiangtan University (Xiangtan, China) in 2005.
Tu Pham obtained her B.S. in Chemical Engineering at the Vietnam National University in Hanoi, Vietnam in 2005. In 2009 she got her M.S. from the Department of Chemistry and Biochemistry at the University of Oklahoma.She joined Dr. Resasco´s group in 2009 as a PhD canbdidate. She is currently working on a project conducting synthesis of carbon nanohybrid for biofuel applications.
Mr. Tennyson completed his undergraduate education at the Northwest Nazarene University in Nampa Idaho in 2004. He received a M.S. in Engineering Physics from the University of Oklahoma in 2008. His research has focused on such diverse fields as scanning radio imagery (a metal detector camera) to nanoparticle plasmonics (light scattering from gold and silver triangles and hexagons) with an emphasis on scan probe techniques. He joined Dr. Resasco's group in 2009 and worked as a research associate until 2011. He is now enrolled in the graduate program and he is pursuing his Ph.D. His current work is focused on composites of carbon nanotubes for battery applications.
The role of water in carbon feed on the surface-guided growth of horizontally aligned single-walled carbon
nanotubes (HA-SWCNTs) was investigated. It is shown that the amount of water can be optimized to favor HA-SWCNT growth, which is proposed to be due to selective etching of carbon deposits at carbon–metal interface. Without water, nanotube–nanotube interaction and carbon accumulation at the interface are disproportionately large compared to the rate of nanotube growth, leading to catalyst deactivation. With excess water, suppression of nanotube growth occurs, resulting in reduced carbon yield on the surface.
Intermediate carbon/water feed ratios achieve cleaner growth with high efficiency.