2. Results and Discussion
C8-TPE-C4TAB-enhanced CL of
luminol-Co2+-H2O2system. As a starting point for our study, we synthesized fluorescent
surfactant C8-TPE-C4TAB according to our
previously reported method and characterized it with1H NMR, MS, steady-state and time-resolved
fluorescence spectrometry.34 All results revealed the
successful preparation of C8-TPE-C4TAB
(Figures S1-S3). As is known, surfactants could facilitate the CL
reaction and enhance the CL signals.35,36 In this
study, the CL signals of
luminol-Co2+-H2O2 in
the absence and presence of C8-TPE-C4TAB
were recorded under pH 7.4 conditions. As shown in Figure 2, the CL
intensity was dramatically enhanced (~20 folds) after
the addition of 80 μM C8-TPE-C4TAB,
indicating the feasibility of
C8-TPE-C4TAB-improved CL intensity of
luminol-Co2+-H2O2system. In addition, the reaction kinetics was also dramatically
decelerated in the presence of
C8-TPE-C4TAB. The enhanced intensity and
extended CL emission kinetics indicated the possibility to construct
long-lasting
luminol-Co2+-H2O2system with the assistance of
C8-TPE-C4TAB.