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Based On The Different Conditions Of Electroplating Gold Glucose Electrochemical Sensor Is Developed

Posted on:2013-11-01Degree:MasterType:Thesis
Country:ChinaCandidate:H Y YangFull Text:PDF
GTID:2248330374977162Subject:Analytical Chemistry
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1. Study of the hydrogen peroxide (H2O2) sensor based on goldelectrodepositionGold was deposited onto the glassy carbon electrode (GCE) underdifferent pH conditions, and the morphology of modified electrode wascharacterized by SEM. The catalytical characteristics was studied withcyclic voltammetry (CV). The modified electrode exhibited verysensitive current responses to hydrogen peroxide and showed goodelectrocatalytic activity in neutral solutions.. Under the optimalconditions, a linear dependence of the catalytic current upon glucoseconcentration was obtained in the range of5-175μM with a detectionlimit of0.5μM (S/N=3). The sensor also exhibits long-term stability, goodreproducibility and good anti-interference ability. 2. A novel glucose sensor based on gold and glucose oxidaseGold was deposited onto the glassy carbon electrode (GCE) underoptimal pH conditions, and the morphology of modified electrode wascharacterized by SEM. A novel biosensor based on gold and glucoseoxidase immobilized on the surface of glassy carbon electrode forglucose detection was developed. The glucose can be determined bydetecting H2O2generated in enzyme reaction due to theelectrocatalytic activity of gold toward H2O2. Under the optimalconditions, a linear dependence of the catalytic current upon glucoseconcentration was obtained in the range of1.0×10-5M-1.6×10-4Mwith a detection limit of6μM (S/N=3). The sensor also exhibits long-termstability, good reproducibility and good anti-interference ability. 3. Preparation of the non-enzyme glucose sensor based on golddeposition with Bu4PBrGold was deposited onto the glassy carbon electrode (GCE) withBu4PBr and the morphology of modified electrode was characterizedby SEM. A novel biosensor based on gold and gold deposited on thesurface of glassy carbon electrode for glucose detection wasdeveloped. The glucose can be determined by electrooxidation ofglucose. Under the optimal conditions, a linear dependence of thecatalytic current upon glucose concentration was obtained in therange of3-15mM with a detection limit of10μM (S/N=3). The sensoralso exhibits long-term stability, good reproducibility and goodanti-interference ability.
Keywords/Search Tags:gold electrodeposition, hydrogen peroxide, electrochemistry sensorgold, glucose oxidase, glucose, sensorgold, Bu4PBr, sensorGlucose, Electrochemistry Sensor, Electrodeposition ofGold
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