Study On Phenols Based On MEO₂MA Polymer Modified Temperature-sensitive Electrochemical Sensor

In recent decades,with the continuous improvement of electrochemical sensor technology,the application of nanomaterials to electrochemical sensors has been the focus of researchers.Sensors made from single-function materials are no longer able to detect environmental pollutants under complex conditions.Today,researchers are working on composite intelligent electrochemical biosensors.Temperature-sensitive polymers are a common environmentally responsive smart material that regulates the solubility of temperature-sensitive polymers by changing the temperature of the external environment.The temperature-sensitive polymer has poor conductivity,and the carbon nanomaterial has excellent electrocatalytic performance and excellent electrical conductivity.The synergistic action of the two materials is used to prepare a specific composite functionalized material,which will have a temperature-sensitive composite modified glass.A temperature sensitive electrochemical biosensor was prepared on the carbon electrode.The main work of this paper is s?Mmarized as follows:?1?The temperature-sensitive block polymer PS-b-PMEO₂MA-b-PS was synthesized by atom transfer radical polymerization?RAFT?method,and the polymer PS-b-PMEO₂MA-b-PS was synthesized.The PS-b-PMEO₂MA-b-PS/MWCNTs?COOH?/GCE electrode was prepared at the interface of the glassy carbon electrode by ultrasonic modification of the carboxylated MWCNTs.The temperature-sensitive reversibility of catechol?CC?in the buffer was investigated by using the composite modified electrode.At the low temperature point?16°C?,the peak current value of CC detected by the modified electrode was small,and the electrochemical sensor was at In the"off"state,at the high temperature point?42°C?,the CC showed a pair of sharp redox peaks on the modified electrode,which was in the"on"state.And the modified electrode realizes linear detection of CC at a high temperature point,and the linear range is 280 nM to 14.56?M.?2?The temperature-sensitive polymer P?MEO₂MA-co-NAM?was uniformly mixed with MWCNTs?COOH?and modified on the surface of the electrode,and hydroquinone?HQ?in the solution was detected by the electrode.The experimental results show that in the low temperature region?15°C?,HQ can not be effectively detected,showing a"off"state,while in the high temperature region?35°C?,it shows excellent detection effect on HQ.The linear range of HQ detected by LSV was from2.86?M to 57.2?M,and the detection limit was as low as 0.91?M?S/N=3?.?3?The water-soluble GO was prepared by H?Mmers method,and mixed with temperature-sensitive polymer PNVCL-b-PMEO₂MA-b-PNVCL and MWCNTs?COOH?to prepare temperature-sensitive for ACOP.Electrochemical sensors.The composite membrane electrode is in an"off"state at a low temperature?8°C?,and is"on"at a high temperature?42°C?.When the temperature ranges from 8°C to 42°C,the peak current value of ACOP varies with temperature.The rise in linearity increases and is slowly compressed like a"spring".The concentration of ACOP in the solution was detected by DPV,and the linear range was 114 nM⁷.068?M.The composite membrane electrode also had good repeatability and stability.