The Study Of Chemiluminescence Analysis And Electrocatalysis Based On Nanomaterials

Chemiluminescence?CL?is a light emission phenomenon,which is produced by excited species from chemical reaction.CL analysis has been widely applied in various fields as one of the most popular analytical methods because of its fast analysis,low detection limits,simplicity of instrumentation and large calibration ranges.Traditional CL system such as luminol,lucigenin need hydrogen peroxide,oxygen or metal ions and so on.However,metal ions and hydrogen peroxide are prone to react with analyte in the CL system,resulting in poor selectivity.Nowadays,with the rapid development of technology and advanced instruments,it is urgent and essential to develop a novel CL system for determination of analytes.Nanomaterials have been widely utilized in variety of scientific field due to their promising properties,such as high surface energy,the large surface area and excellent catalytic.Currently,various analytical platforms have been developed based on the nanomaterials to obtain satisfactory test results.Additionally,catalysis using nanomaterials on CL has attracted considerable attention.Inspired by properties of nanomaterials,the novel CL sensing has been investigated for determination of biomolecule.By the way,the electrocatalytic performance of synthetic Pt-based nanocrystals was evaluated.1.We report that the CDs can promote the CL intensity of lucigenin.A rational CL mechanism of lucigenin-CD system is discussed based on CL emission spectra and the effects of dissolved oxygen and free radical scavengers on the CL intensity.The finding was used to design a method for the determination of Cys.CL increases linearly in the 10.0 to 100?M Cys concentration range,and the detection limit is 8.8?M?at an S/N ratio of 3?.2.We found that fluorescamine can react with luminol in presence of polyvinylpyrrolidone?PVP?to produce strong CL.Once the phenol was added into the solution containing a certain amount of TYR,phenol will be converted to form catechol and further oxidized to o-quinone because of the specific catalysis of TYR.More importantly,o-quinone can effectively quench luminol-fluorescamine-PVP CL.Inspired by such quenching effect,a simple and sensitive CL biosensor for TYR activity detection was established.We obtained a linear evaluation of tyrosinase in the range of 0.19-4.02 U mL^-11 with the detection limit of 0.094 U m L^-1.3.In this study,we synthesized highly excavated octahedral PtCuMo nanostructures with ultrathin mesoporous structures.We estimate electrocatalytic performance of methanol oxidation reaction?MOR?,the electrochemical surface areas?ECSA?of PtCuMo nanostructures is 33.4 m² g^-11 and The mass activity of PtCuMo(2.5 A mg_Pt^-1)is 1.94 times higher than that of commercial Pt/C(1.29 A mg_Pt^-1).