Interaction of Langmuir-Blodgett and spin-coated films of μ-carbido-bridged ironphthalocyanine with NO2: Optical and conductimetric behaviour

Aldo Capobianchi, Anna Maria Paoletti, Gentilina Rossi, Gloria Zanotti, Giovanna Pennesi

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

The present study investigates the interaction of NO2 gas and μ-carbido-bridged iron phthalocyanine (PcFe{double bond, long}C{double bond, long}FePc) films obtained by Langmuir-Blodgett (LB) and spin-coating (SC) techniques. The phthalocyanine bridged dimer under study belongs to the polynuclear unsubstituted phthalocyanines class and presents poor solubility: in contrast the corresponding N-base bis-adducts are soluble enough in organic solvents to be deposited by Langmuir-Blodgett and spin-coating techniques. The reaction with NO2 is monitored by visible spectra variation that shows identical behaviour for both kinds of films, indicating that the chemical reaction between the gas and the films is independent of the deposition method. The electrical conductivity change as a function of time with NO2 is instead dissimilar: for spin-coated films it shows a behaviour already observed for sandwich-type phthalocyanine whereas for LB films it resembles that of monomeric phthalocyanine. Such a response implies that the charges (holes) generated in the oxidation/reduction process are carried differently through the material, and we attempt to explain this behaviour taking into account the two different structural and morphological features induced by the two techniques.

Original languageEnglish
Pages (from-to)159-165
Number of pages7
JournalSensors and Actuators, B: Chemical
Volume142
Issue number1
DOIs
StatePublished - 12 Oct 2009
Externally publishedYes

Keywords

  • Bridged phthalocyanine
  • Langmuir-Blodgett films
  • Nitric oxide
  • Sensors
  • Spin-coated films

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

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