A dc electric field is used to attract thermally charged CdSe nanocrystals in solution to rapidly form large-area, micron-thick films of equal thickness on both electrodes. A pair of Au-on-Si or conducting ITO-on-glass electrodes was submerged in the nanoparticle solution and a dc voltage was applied in a dark room. Uniform, robust, very smooth, and apparently identical films formed on both electrodes. Photoluminescence and absorption of the films showed that they are indeed made of dense arrays of individual nanocrystals. The deposition implies there are both positively and negatively thermally charged dots in solution. These high quality dense arrays of the nanoparticles could be useful in several applications.
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This work was primarily supported by the MRSEC program of the National Science Foundation, under Award Nos. DMR-9809687 and DMR-0213574. BJK was supported by the MRSEC REU program. The authors thank Tony F. Heinz for valuable conversations.
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Islam, M.A., Xia, Y., Kraines, B.J. et al. Electrophoretic Deposition of CdSe Nanocrystal Films on Conducting Electrodes. MRS Online Proceedings Library 737, 55 (2002). https://doi.org/10.1557/PROC-737-F5.5