Symposium CC: Boron and Boron Compounds--From Fundamentals to Applications

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Tunable Growth of Cyclic Twinned Boron-rich Nanostructure by Chemical Vapour Deposition.Jun Yuan1,3, Xin Fu2,3, Jun Jiang2,3, Ziyang Yu2,3 and Lea Steffan1; 1Department of Physics, University of York, York, United Kingdom; 2Department of Materials Science and Engineering, Tsinghua University, Beijing, China; 3Beijing National Center for Electron Microscopy, Tsinghua University, Beijing, China. Boron-rich nanostructures have attracted many attentions because of their high-temperature stability, excellent mechanical and thermoelectrical properties. To move forward, it is vital that we have adequant understanding and control of the growth process involved. Following our success in selective growth of cyclic twinned boron suboxide and boron carbide nanowires with re-entrant surface morphology [1, 2], we conducted a study of the temperature dependence of the microstructure of the nanowires as well as that of the catalysts. Our result suggests that the growth is promoted by catalytic reaction at the re-entrant surfaces at the twin boundaries and that the production of boron suboxide and carbide are influenced by the composition of the catalytic particles, with oxide assisting the growth of boron oxide nanowires and iron borate assisting the growth of boron carbide nanowires. With the suitable adjustment of the temperature range, we have been able to fabricate the boron-suboxide and boron carbide core-shell nanowires as well as boron-suboxide and iron boride core-shell nanowires. Our result has been replicated on iron seeded silicon wafers, opening ways for large scale studies of these interesting nanostructures. [1] J. Jiang, M. H. Cao, Y. K. Sun, P.W. Wu and J. Yuan (2006) Appl. Phys. Lett. 91, 113107 [2] X. Fu, J. Jiang, C. Liu and J. Yuan (2009) Nanotechnology, 20, 365707
Period29 Nov 201030 Nov 2010
Event typeConference
LocationBoston, United StatesShow on map