| Micro-and nano-materials can be used as excellent catalysts in chemiluminescence reaction,which is of great significance to improve the sensitivity of chemiluminescence analysis.At present,many kinds of micro-nano-materials,such as precious metal nanoparticles,carbon spots and organometallic frames,are used in chemiluminescence systems.Based on this,nano-gold flowers have been studied in this paper.The catalytic properties of N-doped graphene quantum dots and a kind of Co-MOF material in chemiluminescence were studied.The chemiluminescence analysis methods for the determination of divalent cobalt ion,trivalent iron ion and glucose were established respectively.The full text is divided into four chapters,the main contents are as followsChapter 1:The present situation of different kinds of micro-nano materials as chemiluminescence sensitizers was reviewed.Chapter 2:Au nanoflowers were prepared on-line by chlorgold acid and hydrogen peroxide in the presence of carbonate buffer solution.Chemiluminescence kinetics studies show that Au nanoflowers have a strong sensitizing effect on the ultra-weak luminescence signal of carbonate-hydrogen peroxide chemiluminescence system.The mechanism shows that the increase of luminescence intensity is probably due to the coupling of singlet oxygen radiation in the excited state with the plasma on the surface of the gold nanoflower.A new chemiluminescence analysis method for sensitive detection of cobalt ions was developed based on the sensitizing effect of cobalt ions on chemiluminescence signals of chlorauric acid-carbonate-hydrogen peroxide chemiluminescence system.The linear range of the method is 8 nM-800 nM and the corresponding detection limit is 3 nM.Chapter 3:In this study,a series of nitrogen-doped GQDs?NGQDs?were synthesized by controlling the hydrothermal treatment temperature and time.Their catalytic performances on the permanganate-sulfite CL system were investigated.It was found that the NGQDs enhanced the CL signal greatly.The effects of NGQDs morphology,structure and composition on the CL signals have been investigated.The concentration of pyridinic N was found playing a key role to influence the CL intensity.It was further demonstrated that the pyridinic N-doped GQDs enhanced CL signal via a hydroxyl radical pathway.Since N atoms and phenolic hydroxyl on the surface of NGQDs can chelate Fe3+and made the CL signal decreased,an effective method was established for the detection of Fe3+in aqueous media based on a CL quenching mechanism,the linear response range is 1×10-8-1×10-6M,and the detection limit is 4 nM.Chapter 4:A metal organic framework material?[Co?L??H2O?2]n,Co-MOF?was synthesized by hydrothermal method,and it was found to have obvious sensitizing effect on luminol-H2O2 chemiluminescence?CL?.The possible enhancement mechanism of Co-MOF in luminol-H2O2 CL system was studied.The Co-MOF sensitized this system is mainly realized by simulating the action of peroxidase to accelerate the decomposition of hydrogen peroxide to produce reactive oxygen species.The luminol-H2O2-Co-MOF CL system was used for the construction of a glucose sensor combined with the glucose oxidase.Under the optimal conditions,the method exhibited a good linear response to glucose in the range of0.048?M with a detection limit of 1.2×10-8 M. |
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