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ZnO nanowire growth: A deeper understanding based on simulations and controlled oxygen experiments

: Subannajui, K.; Ramgir, N.; Grimm, R.; Michiels, R.; Yang, Y.; Müller, S.; Zacharias, M.


Crystal growth and design 10 (2010), No.4, pp.1585-1589
ISSN: 1528-7483
ISSN: 1528-7505
Journal Article
Fraunhofer IAF ()

A binary flow of a Ar/Zn mixture has been used in simulations as well as in physical growth experiments for ZnO nanowire growth by vapor phase deposition. Systematic investigations of the gas transport and the chemical behavior under controlled vacuum and flow conditions revealed that the gases emerging from carbothermal reduction, namely, CO(g) and CO2(g), are not enough to stimulate a controlled ZnO nanowire growth. An optimum O-2 concentration is crucial to promote nanowire growth, while CO(g) and CO2(g) enhance the tendency to grow a film. importantly, the here presented simulations can be used to predict and tailor the region of nanowire growth under appropriate assumptions for any tube furnace.