Materials, Interfaces, and Electrochemical Phenomena

Fabrication of an anionic polythiophene/layered double hydroxide ultrathin film showing red luminescence and reversible pH photoresponse

  1. Dongpeng Yan1,
  2. Jun Lu1,*,
  3. Jing Ma2,
  4. Min Wei1,*,
  5. David G. Evans1,
  6. Xue Duan1

Article first published online: 17 SEP 2010

DOI: 10.1002/aic.12400

Issue

AIChE Journal

AIChE Journal

Volume 57, Issue 7, pages 1926–1935, July 2011

Additional Information

How to Cite

Yan, D., Lu, J., Ma, J., Wei, M., Evans, D. G. and Duan, X. (2011), Fabrication of an anionic polythiophene/layered double hydroxide ultrathin film showing red luminescence and reversible pH photoresponse. AIChE J., 57: 1926–1935. doi: 10.1002/aic.12400

Author Information

  1. 1

    State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, P.R. China

  2. 2

    Institute of Theoretical and Computational Chemistry, Key Laboratory of Mesoscopic Chemistry of MOE, Nanjing University, Nanjing 210093, P.R. China

*State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, P.R. China

Publication History

  1. Issue published online: 9 JUN 2011
  2. Article first published online: 17 SEP 2010
  3. Accepted manuscript online: 17 AUG 2010 08:18AM EST
  4. Manuscript Revised: 5 AUG 2010
  5. Manuscript Received: 17 JAN 2010

Funded by

  • The National Natural Science Foundation of China
  • The 973 Program. Grant Number: 2009CB939802
  • 111 Project. Grant Number: B07004

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Keywords:

  • polythiophene;
  • layered double hydroxide;
  • polarized red luminescence;
  • pH sensor;
  • periodic density functional theory

Abstract

Luminescent ordered ultrathin films (UTFs) based on a sulfonated polythiophene (SPT) and Mg–Al-layered double hydroxide (LDH) nanosheets have been fabricated by the layer-by-layer assembly method. UV-visible absorption and fluorescence spectroscopy showed that there was a stepwise and regular growth of the films with increasing number of deposition cycles. XRD, AFM, and SEM showed that the films had a periodic layered structure with a period of ca. 3.0 nm, and that the thickness can be finely controlled within the range ca. 26–100 nm. The SPT/LDH UTFs show well-defined polarized photoemission with an anisotropy of ca. 0.3, and they show a reversible luminescence response to changes in pH. Periodic density functional theoretical calculations gave a band energy of 1.85 eV for the SPT/LDH system and showed that the valence electrons of SPT can be confined in the energy wells formed by the LDH monolayers, which effectively inhibits both the nonradiative relaxation and the π–π stacking interaction of the polymer chromophores. © 2010 American Institute of Chemical Engineers AIChE J, 2011

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