Dresden 2009 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 28: ZnO: preparation and characterization I
HL 28.7: Vortrag
Mittwoch, 25. März 2009, 11:15–11:30, BEY 118
Direct Synthesis of Zinc Oxide Nanoseaurchins and Nanocups from Zn-Powder — •Yogendra Kumar Mishra1, Seid Jebril1, Rahul Singhal2, Devesh Kumar Avasthi2, and Rainer Adelung1 — 1Functional Nanomaterials, Institute of Materials Science, Faculty of Engineering, CAU Kiel — 2Inter University Accelerator Centre, P. O. Box 10502, New Delhi-110067, India
ZnO, a II-VI semiconductor and a member of wurtzite structure family, has attracted enormous research interest due to it fascinating properties like high exciton binding energy, hydrophobic nature and biocompatibility [1]. In present work, we report the synthesis of ZnO nanourchins and nanocups by a vapour-liquid-solid (VLS) approach from Zn-powder in a tube furnace. The synthesis conditions like temperature and fractions were varied to investigate the fundamental phenomenon of growth. In some cases, formation of ZnO nanocups was observed however in most of the cases growth of long crystalline ZnO nanowhiskers were obtained, suggesting a growth kinetics that will be explained here. Au-ZnO nanocomposite was synthesized by atom beam co-sputtering and formation of ZnO nanorods with Au nanoparticles on the top after annealing at 600C was observed[2]. Scanning/transmission electron microscopies were used to observe the grown nanostructures. Experiments to utilize the structures as sensors as well as in biomedical engineering are in progress, first results are presented here.
[1] Z. L. Wang, Materials Today 26 (June 2004). [2] Y. K. Mishra et al., Appl. Phys. Lett. 92 (2008)43107.