Acta Phys. -Chim. Sin. ›› 2011, Vol. 27 ›› Issue (03): 754-758.doi: 10.3866/PKU.WHXB20110313

• PHYSICAL CHEMISTRY OF MATERIALS • Previous Articles    

Electrostatically Self-Assembled Films Prepared Using Bipolar Thiophene Hemicyanine and Prussian Blue

WANG Zhi-Ping1,2, LUO Hong1, GAO Li-Hua3, WANG Ke-Zhi1   

  1. 1. College of Chemistry, Beijing Normal University, Beijing 100875, P. R. China;
    2. Jining Teachers College, Jining 012000, Inner Mongolia, P. R. China;
    3. School of Chemical and Environmental Engineering, Beijing Technology and Business University, Beijing 100048, P. R. China
  • Received:2010-11-30 Revised:2010-12-12 Published:2011-03-03
  • Contact: WANG Ke-Zhi E-mail:kzwang@bnu.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (20971016, 90922004, 20871011), Fundamental Research Funds for the Central Universities, Beijing Natural Science Foundation, China (2092011) and Measurements Fund of Beijing Normal University, China.

Abstract:

We successfully prepared a novel inorganic-organic hybrid electrostatically self-assembled multilayer film by alternately depositing Prussian blue (PB) and a thiophene-containing hemicyanine. The optical, electrochemical, and photoelectrochemical properties of the as-prepared films were studied by UV-visible absorption spectroscopy, cyclic voltammetry, and photoelectrochemical experiment. Linear increases in the absorbances at 376 and 698 nm with the number of deposited layers, up to at least 8 layers, indicated that film deposition was uniform and reproducible. The PB in the prepared films was found to occur surface-confined rather than diffusion-controlled redox reactions and the peak currents increased with an increase in the number of layers up to 5 layers. Upon irradiation with 100 mW·cm-2 white light the films exhibited stable and reproducible cathodic photocurrents, which increased as the number of layers increased up to 4 layers. A maximum photocurrent density of 0.28 μA·cm-2 was found for the four-layer film at a bias voltage of -0.4 V vs the saturated calomel electrode.

Key words: Hemicyanine, Self-assembled film, Cyclic voltammetry, UV-visible spectrum, Thiophene, Photoelectrochemical property

MSC2000: 

  • O646