Nano Archive

Lithography for Imprinting Colored Patterns with Quantum Dots

Majumdar, Gitanjali and Gogoi, Sonit Kumar and Paul, Anumita and Chattopadhyay, Arun (2006) Lithography for Imprinting Colored Patterns with Quantum Dots. Langmuir,, 22 (7). pp. 3439-3444.

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In this article, we report a new form of lithography that involves a reaction between a gas and an ion embedded in a polymer film. The principle is based on a combination of top-down and bottom-up approaches in which a transmission electron microscope grid is placed on a poly(vinylpyrrolidone) film containing Cd2+ ions, which is then exposed to H2S gas. This leads to the generation of a fluorescent yellow pattern due to the formation of CdS nanoparticles on exposed parts of the film. Also, we have used the same method to generate patterns in two colors by starting with a green fluorescent dye incorporated into the film and following the same procedure in which patterned yellow-orange CdS nanoaparticles are distributed over the background fluorescence of the dye. We have used fluorescence microscopy, UV−vis and fluorescence spectroscopy, transmission electron microscopy, atomic force microscopy, and X-ray diffraction methods for the characterization of the products and patterns. This method could possibly be a fairly general method of generating patterned materials on 2D and 3D substrates.

Item Type:Article
Subjects:Material Science > Nanochemistry
Divisions:Faculty of Engineering, Science and Mathematics > School of Chemistry
ID Code:4370
Deposited By:JNCASR
Deposited On:03 Apr 2009 06:34
Last Modified:03 Apr 2009 06:34

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