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Study of the New Electrochemical Sensors Bazed on the Electrodeposition Nano-Copper

Author: LuYaHui
Tutor: FengJiuJu；DongWenJu
School: Henan Normal
Course: Analytical Chemistry
Keywords: Metal nano- modified electrode Glucose Nitrate Peroxide Electrocatalysis Electrodeposition Nano-copper
CLC: TP212.2
Type: Master's thesis
Year: 2011
Downloads: 58
Quote: 0
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Abstract


Chemically modified electrode is a very active area of ??research in the current analysis of electrochemical one. Metal nano-modified electrode due to its preparation method is simple, easy, long electrode life, and has a special three-dimensional micro-structure and the advantages of extensive research and application. Metal nano-modified electrode has been involved in many areas of chemistry, materials science, physics and biology, it is not only in the analysis of the chemical, biological and electrochemical basic research has important significance in the life sciences, environmental also has important applications in the field of science and energy science. This paper focuses on the electro-deposition of nano copper to build a new type of electrochemical sensors, mainly carried out in the following part of the work. Dendritic copper modified electrode using electrochemical deposition synthesis the dendritic nano Copper (Cu - DNWs) is on a glassy carbon electrode. Cu - the synthesis and deposition potential of DNWs (Eappl), the pH of the electrolyte, the electrolyte temperature, and the solution the of Cu 2 and citric root ions closely related. The synthesis of dendrimers nano copper very sharp peak of the (111) crystal faces, the maximum intensity, and the peak of the crystal face (200) and crystal plane (220) is relatively small, the strength is weak. Prepared dendrimer nano-copper electrode has a fast response, high sensitivity, wide linear range. Silver nano-modified electrode on glassy carbon electrode by electrochemical deposition method first synthesized single-layer nano-copper film, and then after the replacement reaction sacrifice copper template prepared silver nanoparticles modified electrode using a scanning electron microscope to characterize the electrode surface silver nano particle morphology, crystal structure of silver nanoparticles were characterized by X-ray diffraction techniques. Silver nano-modified electrode catalytic nitrate has a higher sensitivity and detection limit: 0.035 mM (S / N = 3). , MP-11 / Cysteamine / Au modified electrode utilization of the electroplating copper template layer of porous nano-gold film is formed after the displacement reaction on a glassy carbon electrode. The gold film having a large specific surface area, can be used as the base used to adsorb fixed redox protein MP-11 (microperoxidase-11, micro-peroxidase -11) to construct a novel hydrogen peroxide (H 2 O 2 ) biosensor. The electrodeposited copper template and prepared prepared porous nano-gold film morphology were characterized by scanning electron microscopy (SEM) and by X-ray diffraction techniques, which were characterized by their crystallographic orientation. Further, the use of cyclic voltammetry of the performance of different electrode for detecting hydrogen peroxide sensor compared and modified MP-11/Cysteamine / Au modified electrode of each step obtained in the electrode preparation process on the oxygen reduction were studied and compared.

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