Study On Electrochemical Sensing Properties Of Temperature Sensitive Polymer/Functionalized MWCNTs Composites

In recent years,with the deepening of research on electrochemical sensors and the continuous development of material-related science,the application of single materials to electrochemical sensors has been unable to meet the needs of practical applications.Therefore,researchers are constantly exploring new materials for electrochemical sensors.Polymeric materials with different properties and nano-carbon composites have been extensively studied,and it is hoped to obtain more intelligent electrochemical sensing materials.Temperature-responsive polymers change their segment structure with temperature and have unique temperature-sensitive properties.Nanocarbon materials have been widely used in recent years due to their excellent physical and chemical properties.The combination of temperature-responsive polymers and nanocarbon materials into composite modifiers can maintain the conductivity and electrocatalytic properties of nano-carbon materials.At the same time,the composite material can have temperature response characteristics,making the composite modified electrochemical sensor more intelligent,which opens up a new direction for future research and development.The main work of this paper is summarized as follows:(1)A temperature-sensitive poly(N-isopropylacrylamide-co-2-methyl-2-acrylic acid-2-(2-methoxyethoxy)ethyl ester)P(NIPAM-co-MEO2MA)was synthesized by random copolymerization,the synthetic temperature-sensitive polymer and carboxyl functionalized multi-walled carbon nanotubes(MWCNTs(COOH))are prepared into a composite modified material modified electrode to detect hydroquinone(HQ).It has good reversibility between 26-40 °C and low detection limit and wide linear range for the detection of hydroquinone(HQ)at 40 °C.(2)A temperature-sensitive polymer(N-isopropylacrylamide-b-dimethyl aminoethyl methacrylate)P(NIPAM-b-DMAEMA)was synthesized by chain transfer radical polymerization,and functionalization was also prepared.The carbon nanotubes MWCNTs(COOH)-SDS is a composite modified electrode prepared by ultrasonically mixing P(NIPAM-b-DMAEMA)and MWCNTs(COOH)-SDS at an optimum ratio to detect dopamine.Based on the lowest critical temperature LCST(32 °C)of P(NIPAM-b-DMAEMA),it has obvious temperature response "ON-OFF" when detecting dopamine,and has good reversibility between temperatures of 26-42 °C.Switching performance.The detection of dopamine(DA)by the modified electrode at 42 °C has a lower detection limit and a wider linear range.(3)P(NIPAM-co-NTBAM)was synthesized by free radical polymerization,and the composite material(MWCNTs(COOH)/GO)was prepared by using graphene and carboxyl functionalized carbon nanotubes.P(NIPAM-co-NTBAM)The composite modified material was modified to a surface of glassy carbon electrode by ultrasonic mixing with(MWCNTs(COOH)/GO)in a certain ratio.The detection of acetaminophen(AP)at the lowest critical temperature LCST(28 °C)was studied.Has an obvious temperature response "ON-OFF" effect.The composite modified electrode has good reversible switching characteristics between 20-36 °C,and has low detection limit and wide linear range for the detection of acetaminophen(AP).