Fluorescence of polyaniline films on electrode surfaces: Thickness dependence and surface influence

An experimental study of the intrinsic fluorescence emission and Electrochemically Induced Ageing in poly-o-methylaniline films

“…As the potential increases (E > 0 V), the relative fluorescence, F/F a , starts depending on the thickness, it decreases more the thicker is the sample. Similar results have been reported for Pani and poly-o-anisidine films upon platinum electrodes [22].…”

“…The fluorescence response of Pma films deposited on Au electrodes was studied in sulphuric acid media. The emission strongly depends on the applied potential as it was reported for similar polymers [20][21][22]. The creation of charge carriers as the polymer is oxidized is related with the fluorescence attenuation.…”

“…There are some works about Pani as emitting films in electroluminescent diodes [16], studies of Pani in different oxidation states by using fluorescence microscopy [17], and about the influence of torsion angle between adjacent rings [18] and chain length [19] on the emission properties. More recently, Molina et al have studied the fluorescence of films of Pani and some derivatives with applied potential, explaining the changes observed with film thickness, potential and copolymerization degree [20][21][22][23]. Finally, Mallavia et al have shown that potentiodynamic measurements of fluorescence emission can provide very useful information about the charge transfer process and exciton dynamic in CPs [24][25][26].…”