Electric Field Directed Layer-by-Layer Assembly of Highly Fluorescent CdTe Nanoparticles

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Abstract:

An electric field directed layer-by-layer assembly technique has been developed by combining electrophoretic deposition and the layer-by-layer self-assembly method. This technique is employed to realize spatially selective deposition of CdTe nanoparticles on electrodes of indium–tin oxide (ITO). The fluorescence measurements prove that the selectivity of the film deposition increases against applied voltage and reaches 99% when the voltage is 1.4 V. Upon further increase of the voltage, the selectivity slightly decreases. This decrease occurs because high voltage leads to a degradation of CdTe particles and thus reduces fluorescence intensity of the resultant CdTe film. However, fluorescence investigation indicates that a spacer layer of polyelectrolyte complex between the ITO electrode and the CdTe film is useful to protect the CdTe from being destroyed under high voltages.

Keywords: CDTE NANOPARTICLES; ELECTRIC FIELD DIRECTED ASSEMBLY; LATERAL STRUCTURE; LAYER-BY-LAYER SELF-ASSEMBLY; SPATIALLY SELECTIVE DEPOSITION

Document Type: Communications

DOI: http://dx.doi.org/10.1166/jnn.2001.029

Affiliations: Department of Physics and Center of Nanoscience, University of Munich, Amalienstrasse 54, D-80799 Munich, Germany

Publication date: June 1, 2001

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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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