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http://dx.doi.org/10.3740/MRSK.2009.19.10.527

Characterization of Electrochromic Properties of Au Nanoparticles Incorporated Poly (3, 4-ethylenedioxythiphene) Film  

Lee, Jong-Seok (Department of Materials Science and Engineering, Yonsei University)
Koo, Kyoung-Hoe (Sam Young Fil-Tech. LTD)
Park, Hyung-Ho (Department of Materials Science and Engineering, Yonsei University)
Publication Information
Korean Journal of Materials Research / v.19, no.10, 2009 , pp. 527-532 More about this Journal
Abstract
The electrochromic properties of Au nanoparticles (NPs) incorporating poly (3, 4-ethylenedioxythiphene) (PEDOT) film were investigated. Trisodium citrate was used for stabilizing Au NPs to control the size. The capping molecules of the Au nanoparticles were exchanged from citrate to 2-mercaptoethanol (2-ME). Water was removed by centrifuge and Au NPs were redispersed in methanol (MeOH). Finally, we obtained ca. 11.7 nm diameter of Au NPs. The effects of 0.15 at% of Au NPs incorporation on the optical, electrical, and eletrochromic properties of PEDOT films were investigated. The electrical property and switching speed of Au/PEDOT film was slightly improved over that of PEDOT film because Au NPs play a hopping site role and affect packing density of the PEDOT chain. Through the ultra violet-visible spectra of PEDOT and Au/PEDOT films at -0.7 V (vs Ag/AgCl), blue shift of maximum absorption peak was observed from PEDOT (585.4 nm) to Au/PEDOT (572.2 nm) due to a shortening of conjugated length of PEDOT. The Au NPs interfered with the degree of conjugation and the maximum absorption peak was shifted to shorter wavelength.
Keywords
electrochromic; PEDOT; Au nanoparticles; hybrid film; switching speed;
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