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Effect of Oxidation Induced Surface State Formation on the Properties of Colloidal CdSe Quantum Dots

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Abstract:

This article addresses on the issue of oxidation on the organically capped CdSe nanoparticles. The surface states properties of the nanoparticles were monitored as a function of time during the natural exposure to oxygen and light, to determine the long term stability of the CdSe quantum dots. CdSe nanoparticles were chemically prepared using three different compositional regimes, viz., Cd rich, Se rich, and stoichiometric and were of different sizes in the range of 5–7nm. The optical and the structural properties in the three cases were significantly different when the nanoparticles were subjected to natural oxidation. The CdSe nanoparticles were probed using Ar+ ion sputtering used in conjunction with X-Ray Photoelectron Spectroscopy for structural analysis, where as the optical studies were done using UV-VIS and the Photoluminescent measurements. The results showed a blue shift and a considerable decrease in the intensity associated to surface states ( ∼ 600–700 nm) in case of Se rich case, no shift in stoichiometric CdSe suggesting that its stable against oxidation, and a red shift in PL position in Cd rich regime. The Stoke's shift observed in the non-stoichiometric cases can be associated with the quantum confinement and the stress/strain effects. The result demonstrate the role of Cd/Se stoichiometry in tuning the surface states for tailoring the desired optical properties.

Keywords: CDSE QUANTUM DOTS; DEPTH PROFILE; OXIDATION; PL; STOKE'S SHIFT; SURFACE STATES; XPS

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2007.747

Publication date: June 1, 2007

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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