Nanotech 2011

Attachment of Quantum dots and gold nano particles on ZnO nanorods and nanotubes

P. Hari, J. Seay, H. Liang
The University of Tulsa, US

Keywords: ZnO, nanorods, nanotubes, surface morphology

Abstract:

ZnO nanorods grown by hydrothermal technique are of great interest for potential applications in photovoltaic and optoelectronic devices. In this study we investigate the Optimization of the optical absorption properties by a wet chemical bath deposition technique. We fabricated nanorods on indium tin oxide (ITO) substrate with a precursor solution of zinc nitrate hexahydrate ((ZnNO3)2•6H2O) and hexamethylenetramine (C6H12N4) (1:1 molar ratio) at 95°C for 9 hours. In order to optimize the light absorption characteristics of ZnO nanorods, CdSe/ZnS core-shell quantum dots (QDs) of various diameters were attached to the surface of ZnO nanostructures grown on ITO and gold-coated silicon substrates. Density of quantum dots was varied by controlling the number drops on the surface of the ZnO nanorods. For a 0.1 M concentration of QDs of 10 nm diameter, the photoluminescence (PL) intensity at 385 nm increased as the density of the quantum dots on ZnO nanostructures was increased. For quantum dots at 1 M concentration, the PL intensity at 385 nm increased at lower density and then decreased at higher density. We will discuss the observed changes in PL intensity with QD concentration with ZnO-QD band structure and recombination-diffusion processes taking place at the interface.
 

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