The Chemical Oxidation Synthesis And Property Of Polyluminol And Its Composite

Conductive polymer has been paid much attention. As an aniline derivative, the polymerization of luminol and the study of polyluminol in electrochemistry and electrochemiluminescence(ECL) have also been paid much attention. The new ECL sensing methods using polyluminol as luminescent reagent not only broadened the application of ECL of luminol, but also simplified the process of construction of luminol-based ECL sensor and the analysis procedure, which is favor for the development of instrument miniaturization and simplification. However, few studies have reported for the synthesis of polyluminol or its composite nanomaterials synthesized in solution and its application. This article focuses on the synthesis of polymeric luminol by chemical oxidation in solution and the properties of polymeric luminol.Firstly, the fluorescence and chemiluminescence properties of polymeric luminol synthesized by chemical oxidative reaction in solution were studied, and the effect of the fluorescence excitation wavelength and medium on the fluorescence of polymeric luminol was studied; the chemiluminescence of the polymeric luminol was studied, too. It was found that maximum fluorescence emission wavelength red shifted obviously for the polymeric luminol compared to luminol, and the polymeric luminol still maintained luminol chemiluminescent property. The resulting polymeric luminol was investigated using UV-visible, infrared IR and thermal gravimetric analysis, and the results showed that: in the aqueous solution of luminol, the production of the reaction of the luminol and strong oxidizing agent contained both 3-aminophthalic acid salt and polymeric luminol.Secondly, this work provides a new method for the synthesis of nanomaterials polyluminol class, Poly(aniline-luminol) composite nanowires were synthesized by chemical oxidation of ammonium peroxydisulfate. In contrast to the maximum fluorescence emitting wavelength of luminol at 425 nm, the maximum fluorescence emitting wavelength of the polymeric luminol in the composite nanowires was red shifted 40 nm obviously. The poly(aniline-luminol) composite nanowires can be modified on a graphite electrode surface by drop coating, forming a stable poly(aniline-luminol) composite nanowires film. The poly(aniline-luminol) composite nanowires film modified electrode presents favorable electrochemiluminescence(ECL) performances, and the ECL can be enhanced by hydrogen peroxide. Under the selected condition, the modified electrode provides a linear range between 5.0×10-9 mol/L ~ 1.0×10-5mol/L for the detection of hydrogen peroxide with a detection limit of 2×10-9 mol/L.