Studies On Temperature Sensitive Electrochemical Sensor Based On N-N Diethyl Acrylamide

With the rapid development of nanotechnology and the cross-penetration of materials science,life chemistry,polymer science,all kinds of functional nanomaterials emerge in endlessly.With the extensive application of these nanomaterials in modified electrodes,electrochemical sensors with different functions and structures have been developed rapidly.The electrochemical sensor made of a single modified material can no longer meet the practical requirements.Electrochemical sensors that combine stimulus-responsive polymers with nanomaterials have attracted increasing attention from researchers.Stimulant response polymer is a new kind of polymer material which can react quickly with small external stimuli and then undergo physical or chemical changes.Applying it to the electrochemical sensor can improve its selectivity and realize the intelligence of the sensor,while the addition of carbon nanomaterials can greatly improve the stability and sensitivity of the electrochemical sensor.In this paper,carbon nanomaterials and temperature-sensitive polymers were mixed to prepare composite materials to modify electrodes,and a series of electrochemical sensing platforms with temperature stimulus response were constructed,so as to realize intelligent switch detection of different targets.The specific contents are as follows:(1)Using N,N-diethylacrylamide and N-isopropyl acrylamide as monomers,azo-diisobutylene(AIBN)as initiator and 1,4-dioxane hexyclic as solvent,a temperature-responsive polymer(DEA-CO-Nip AM)was synthesized by reversible addition-RAFT polymerization and then mixed with BiOBr-GO to prepare composite material modified to the surface of the glass-carbon electrode.An intelligent "on-off" electrochemical sensor was constructed to detect catechins(CC).It was proved that the CC detection limit of P(DEA-CO-NIPAM)/ BIOBR-GO modified electrode was 0.142?M and the linear range was 2 ? 150 ?M,and it had good reversibility and stability.(2)Carbon nanotubes(CNTS),iodine-doped bismuth chloride(BISmuth oxychloride)and graphene were prepared and mixed with temperature sensitive polymer(DEA-CO-NIPAM)to form a composite modified on the glass-carbon electrode.It was found that the detection limit of P(DEA-CO-NIPAM)/I-BIOCl-GO/MWCNTs(COOH)was 9.6 nM and the linear range of 0.0866 ?M-1.299 ?M and 1.299 ?M-9.745 ?M for Luteolin(LU)at 46? by using a modified electrode.At the same time,it has good reversibility in the temperature range of 10??46?.(3)DEA-CO-NIPAM,BiOBr-GO and amino fossil inkenes were mixed to prepare a temperature-sensitive composite membrane.A temperature "zipper switch" electrochemical sensor for detecting AP was constructed with the composite membrane modified glassy carbon electrode.The detection of AP by composite modified material has a good reversible temperature performance between 10? and46?,and the detection of AP at 46? has a low detection limit and a wide linear range.