Building Nanostructures From Below and Putting Them to Use for Energy Conversion

Time: 9:30-11:30 am

Date: Dec. 31 , 2010
Location: The Institute for Advanced Materials and Nano Biomedicine (iNANO), 67 Chifeng Road
Reporter: 杨世和(香港科技大学 教授)

Nanomaterials with quantum confinement of electrons and high specific surfaces have spurred new research directions and are expected to enable new generations of devices. We have developed a number of bottom-up approaches to the growth of well-defined nanostructures. This talk will highlight our recent efforts on the nonhydrolytic synthesis of ultrathin crystalline wires of TiO2 (anatase) with tunable diameters from 5 nm down to ~4 Å, reaching the regime of atomic wires with the true one-dimensionality (1D). It is shown that the anatase titania atomic wires could be doped and stabilized with nitrogen species by introducing suitable nitrogen-containing molecules. I will then move on to present our recent work on exploring another nanomaterial of ZnO tetrapods we developed with thin arms for novel photoanodes of dye-sensitized solar cells (DSSCs). Our systematic studies have established that such photoanode architecture features good crystallinity, network forming ability, limited electron-hopping interjunctions, and a decent roughness factor. We have achieved high efficiency with these solar cells even when the photoanodes were not calcined, opening a new avenue for the development of flexible solar cells.

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