3.2. Influence of the operating conditions on the
fluorescence intensity signal of Sn–PAN complex
3.2.1. Effect of type of surfactant
Several anionic (SDS and AOT), cationic (CTAB) and nonionic
(Triton X-100 and Brij-35) surfactants were tested in order
to solubilize the complex and possibly enhance the fluorescence.
All of the tested surfactants were able to solubilize the complex
but the solutions became turbid after a few minutes. Among
these surfactants, AOT gave the highest fluorescence intensity
but this solution was also instable. Therefore, Triton-X100 was
also added as an auxiliary surfactant. Under these conditions
the solutions were stable at least for 24 h. Figs. 2 and 3 show
the influence of concentrations of both surfactants on the fluorescence
intensity of Sn–PAN complex. Based on these results,
concentrations of 8×10−4M and 0.025% (v/v) were selected
as suitable concentration for AOT and Triton X-100, respectively.
It should be mentioned that in lower concentrations of