Layer-by-layer assembled highly absorbing hundred-layer films containing a phthalocyanine dye: Fabrication and photosensibilization by thermal treatment

Alena S. Sergeeva, Elena K. Volkova, Daniil N. Bratashov, Mikhail I. Shishkin, Vsevolod S. Atkin, Aleksey V. Markin, Aleksandr A. Skaptsov, Dmitry V. Volodkin, Dmitry A. Gorin

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Highly absorbing hundred-layer films based on poly(diallyldimethylammonium chloride) (PDADMAC) of various molecular weights and on sulfonated copper phthalocyanine (CuPcTs) were prepared using layer-bylayer assembly. The multilayer films grew linearly up to 54 bilayers, indicating that the same amount of CuPcTs was adsorbed at each deposition step. This amount, however, was dependent on the molecular weight of PDADMAC in the range 100-500 kDa: the higher the molecular weight, the more CuPcTs molecules were adsorbed. This can be explained by the larger surface charge number density specific to longer polymer chains. Domains of pure PDADMAC and of the PDADMAC/CuPcTs complexwere formed in the films during the assembly. Uniformdistribution of CuPcTs over the films could be achieved by thermal treatment, leading to anα→β phase transition in phthalocyanine at 300 °C. Annealing caused changes in the film absorbance spectra, resulting in a 30-nm red shift of the peak maxima and in a strong (up to 62%) decrease in optical density. Thermogravimetric analysis revealed thermodegradation of PDADMAC during annealing above 270 °C, giving rise to micrometersized cracks within the films, as evidenced by scanning electron microscopy.

Original languageEnglish
Pages (from-to)60-69
Number of pages10
JournalThin Solid Films
Volume583
Issue number1
DOIs
Publication statusPublished - 2015
Externally publishedYes

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Keywords

  • Absorption spectra
  • Copper phthalocyanine
  • Layer-by-layer assembly
  • Multilayer thin films
  • Polyelectrolytes
  • Surface morphology
  • Thermogravimetry analysis

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry
  • Metals and Alloys
  • Surfaces, Coatings and Films
  • Surfaces and Interfaces

Cite this

Sergeeva, A. S., Volkova, E. K., Bratashov, D. N., Shishkin, M. I., Atkin, V. S., Markin, A. V., Skaptsov, A. A., Volodkin, D. V., & Gorin, D. A. (2015). Layer-by-layer assembled highly absorbing hundred-layer films containing a phthalocyanine dye: Fabrication and photosensibilization by thermal treatment. Thin Solid Films, 583(1), 60-69. https://doi.org/10.1016/j.tsf.2015.03.050