Thin films of fluorinated 3d-metal phthalocyanines as chemical sensors of ammonia: An optical spectroscopy study

Tamara V. Basova, Natalia S. Mikhaleva, Aseel K. Hassan, Vitaly G. Kiselev

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)

Abstract

A comparative study of the sensor response toward gaseous ammonia of hexadecafluorinated 3d-metal phthalocyanine (MPcF16, M=Cu(II), Co(II), Zn(II), Ni(II)) thin films was performed using complementary experimental (viz., surface plasmon resonance, SPR, and IR absorption spectroscopy) along with theoretical (density functional theory calculations, DFT) techniques. SPR measurements revealed changes of both thickness and optical parameters (refraction indices and extinction coefficients) of the MPcF16 films caused by adsorption of NH3. The MPcF16 species studied exhibited the following order of sensor response: ZnPcF16 > CoPcF16 ≥ CuPcF16 > NiPcF16. A good correlation was found between the DFT calculated (B3LYP/6-311++G(2df,p)) binding energies, experimentally measured shift of the selected IR bands, and the optical sensor response. Apart from this, we performed a detailed assignment of all intense bands in the vibrational spectra (IR and Raman) of fluorinated 3d-metal phthalocyanines studied.

Original languageEnglish
Pages (from-to)634-642
Number of pages9
JournalSensors and Actuators, B: Chemical
Volume227
DOIs
Publication statusPublished - 1 May 2016

Keywords

  • Ammonia detection
  • DFT
  • Hexadecafluorinated phthalocyanines
  • Optical sensors
  • SPR
  • Vibrational Spectra

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