Projects Synthesis Materials Fabrication Devices Characterization Theory
This year we have nearly 30 projects covering a wide range of nanoscience, including facile synthesis of organic and inorganic nanowires and nanostructures, novel fabrication routes, building of functional bioarchitectures, nanostructured devices and nanowire applications. Please browse the menu (hover on a group and click on the project of choice) to view brief overviews of our projects.
Synthesis of CuO and Cu2O nanostructures via a Vapor Solid Transport Process
The phase diagram of copper and oxygen implies high temperature (11000C and above) is necessary to synthesize stable CuO from a solid source. However by employing a metal-organic dry source we have been able to synthesize CuO micro and nanostructures at low temperature (600-9000C) without a catalyst in a simple tube furnace. The morphology was controlled by the position of the substrate with respect to the source material as well as the temperature. A single morphology covered up to 2 cm uniformly on the substrate. Upon increasing the temperature above 9000C and using a catalyst, vapor solid growth leads to Cu2O nanocrystals. These crystals were also uniformly distributed over the substrates and covered up to 4 cm. We are currently investigating the exact growth mechanism and optimizing the conditions for one-dimensional growth.


CuO nanostructures grown at low temperature. All scale bars are 1 micron


Cu2O nanocrystals grown at high temperature. Black arrows indicate the 111 direction. The cartoon shows the (111) plane slice through the lattice

Publications:
[1] D.S. Rhen and D.J. Kang “Nanostructures of CuO and Cu2O by Thermal CVD”, Ep-III-016, KPS April 2009.
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