Journal
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
Volume 1, Issue 2, Pages 133-136Publisher
AMER SCIENTIFIC PUBLISHERS
DOI: 10.1166/jnn.2001.029
Keywords
CdTe nanoparticles; electric field directed assembly; lateral structure; layer-by-layer self-assembly; spatially selective deposition
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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.
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