| P?3,4-ethylene dioxythiophene??PEDOT?is a polymer material,in the sensing field of polymer,PEDOT has shown excellent conductivity,ultra-high electronic transmission rate for the sensing provides a high sensitivity and low detection limit basis.Two-dimensional nano-transition metal sulfides are a kind of graphene material,and the discovery of graphene has raised the prospect of two-dimensional materials in sensing,biology,energy and even aerospace.Two-dimensional transition metal sulfide has a structure similar to that of graphene,showing excellent catalytic performance,large specific surface area,excellent capacitive performance and other excellent properties in the sensing field,making it widely used in the sensing and catalysis field.Flavonoids have 2-phenylflavone?flavone?structure,and have antitussive,anti-asthmatic and therapeutic effects on cardiovascular and cerebrovascular diseases in human body.Therefore,it is very important to master a fast detection method with low detection limit and high sensitivity.Based on the above investigation,this paper develops three electrochemical sensors for rapid detection of flavonoids based on the conductive polymer PEDOT and two transition metal sulfides as composite materials.?1?A porous nano-hybrid material for ultracapacitors and nanosensors was prepared on the surface of porous conductive poly?3,4-ethylenedixylene dioxythiophene??PEDOT?using graphene-type tungsten disulfide?WS2?nanometer sheet to detect quercetin?Qu?extracted from lotus leaves.By one-step electropolymerization of commercial monomer in acetonitrile solution,the conductive PEDOT with rough,porous and irregular surface was prepared,and then WS2nanometer sheet dispersed droplets were coated on the synthesized PEDOT to obtain WS2/PEDOT.WS2/PEDOT porous nano hybrid material in the current density of 0.2A g-1 showed high capacitance characteristic,the specific capacitance of 70.64 F g-1,under the optimum operation conditions,Qu in 1.5×10-4 mol,within the scope of L-1has good cycle stability,a 5000 cycles after the capacitor to keep at a rate of 90.74%,the detection limit of 50 nm?LOD?and 1.76?A?m-1cm-2 good voltammetric response within the limits of sensitivity.The nano-hybrid sensor was applied to the electrochemical detection of Qu in real samples.This work will provide an experimental basis for the future integration of supercapacitors into self-powered electrochemical energy storage systems.?2?A novel,high sensitivity and high stability luteolin electrochemical imprinting sensor was successfully prepared by using a 2D layered molybdenum disulfide?Mo S2?nanosheet modified poly?3,4-ethylene dioxythiophene??PEDOT?molecular imprinting membrane.A novel molecularly imprinted sensor was prepared by electrochemical copolymerization with luteolin as the carrier.In this composite PEDOT material,Mo S2 is used to provide a large specific surface area and improve the electro-catalytic capability of the sensor.In order to further study Mo S2-MIPs/GCE,it was characterized by scanning electron microscopy,and its electrochemical properties were studied by cyclic voltammetry and differential pulse voltammetry.Under optimized conditions,the response of Mo S2-MIPs/GCE detection of luteolin increased linearly with the increase of luteolin concentration,the concentration range was0.002?0.9m,and the detection limit was 0.7 n M.It was successfully applied to the electrochemical detection of luteolin in the seeds of acine,with good repeatability,repeatability and storage stability.?3?The prepared Mo S2 nanometer tablets were prepared by mechanical stripping method,and the prepared 3D-r GO and PEDOT were used to detect hypericin extracted from watercress.3D-r GO/Mo S2/PEDOT was prepared by chemical polymerization of commercially available monomer in chloroform solution with rough,porous and irregular conductive PEDOT.Good voltammetric response was obtained within the detection limit of 50 n M?LOD?and the sensitivity range of 1.87?A?m-1cm-2.The nano-hybrid sensor was applied to the electrochemical detection of hypericin in real samples. |
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