The Preparation Of Electrochemical Sensor Based Copper Microparticles On Platinum Electrode Surface

Electrochemical sensor can detection glucose concentration directly or indirectly based on the linear relationship between glucose concentration and electrical signals.Electrochemical glucose sensor research mainly focus on two aspects:one is electrochemical enzymeless glucose sensor; On the other hand, is enzymatic glucose sensors. Electrochemical enzymeless glucose researches kept focusing on the glucose oxidation on bare platinum surface, however the catalytic oxidative activity of metal is low, the performance of sensor without enzyme glucose is poorer. In order to improve electrochemical catalytic oxidation activity and selectivity of the platinum electrode many studies have committed to modified platinum surface with the other metal. The sub-monolayers of metals on platinum, which are formed by underpotential deposition (UPD), give anodic current of glucose markedly enhanced. Copper as an important metal element, distribution quantity, the price is low, copper and the electrode based on copper have electricity catalytic activity to reduction process, the synthetic copper particles and put it to modified electrode have important meaning.The electrochemical route has been applied for the detection of electroinactive amino acids on the surface of noble metal (such as Au, Pt) or have a catalytic effect of transition metals (such as Cu, Ni), respectively. The electrode based on copper modified electric catalytic and detected amino acids has been used.The oxidation of glycine at platinum electrode modified by copper particles in alkaline solution, generate Cu (Ⅱ)with electrochemical scanning,,and Cu (II) can complex with glycine, glycine can be adsorption in the electrode surface, which can cause large current response and be detected.According to the way of electrochemical signal conversion, there are two kinds of glucose biosensor:amperometric sensor and potentiometric sensor. The pH glass electrodes can be used for detecting glucolactone which generated by reaction process, you can also use iodine ion selective electrode, through the reduction of iodine ion concentration to determine glucose.The advantages of potential sensor are instrument simple and easily miniaturization, so research and development potentiometric sensor are significant and promotion.1in the alkaline solution,the method of electrochemical deposition formed copper microparticles modified platinum electrode surface,Cu-EDTA complex solution containing glucose and detecting glucose content directly, We explore the factors of affect the results which of deposition potential, deposition time, NaOH concentration, under the optimal conditions, glucose detection limit of2×10-4mol/L. The modified electrodes with good reproducibility, sensitivity and anti-interference, glucose injection detection recovery can be amounted to85.7%. The sensor can be used to actually detection.2The method of electrochemical deposition formed copper microparticles modified platinum electrode surface in the alkaline solution Cu-EDTA complex solution containing glycine and detecting glycine content directly, We explore the factors of affect the results which of deposition potential, deposition time, NaOH concentration, under the optimal conditions, glycine detection limit of5×10-5mol/L, the modified electrodes with good reproducibility, sensitivity.3Novel polyvinyl chloride (PVC) membrane electrodes containing triheptyl dodecyl ammonium iodide as electroactive materials exhibit excellent potentiometric response to the complex of hydrogen peroxide and hexavalent molybdenum. A potentiometric glucose biosensor was developed based on the PVC film electrode which was employed as a platform to immobilize Glucose oxidase (GOD). In addition, the biosensor exhibits high stability and good selectivity against common interfering species such as ascorbic acid, uric acid and some kinds of amino acids.