Study Of The New Electrochemical Sensors Bazed On The Electrodeposition Nano-Copper

The study of chemically modified electrode is an active field of electroanalytical chemistry presently.Due to its easy preparation, strong attachment to the electrode surface, special microstructure and manyother excellent electroanalytical characteristics, nano-metal modified electrode has distinguished itself asone of widely used electrode. The research of nano-metal modified electrode involves in many fields suchas chemistry, physics, biology, material sciences, and so on. Nano-metal modified electrode has animportant theorial significance in analytical chemistry, bioelectrochemistry and organic electrosynthesis. Atthe same time, it has been applied to biology, energy sources, environment and material science practically.In this thesis, we developed our work focusing on electrodepotision of nano-copper for fabricating newelectrochemical sensoring, which has been dealt in the following three parts.1. Cu dendritic nanowires Modified Electrode.Cu dendritic nanowires (DNWs) were synthesized by electrochemical deposition on a glassy carbonelectrode, which was closely related with the reduction potential, pH and temperature of the electrolysissolution, as well as the amount of Cu²⁺ and citrate ions. In particular, for the synthesized Cu DNWs, theintensity of the crystal plane of (111) was sharp and strong, much stronger than that of either (200) or (220)plane. For potential or practical applications in fuel cells and sensors, the Cu DNWs electrode was tested asa non-enzyme glucose sensor in alkaline media with fast response, high sensitivity and broad linear range.2. Silver nanoparticles Modified Electrode.We report the fabrication and characterization of silver nanoelectrode on a glassy carbon electrode. Forthis purpose, Ag nanoparticles (NPs) fabricated by a facile template technique. The Ag -NPs ischaracterized X-ray powder diffraction method. The surface morphology of the Ag modified electrode wasassessed by scanning electron microscopy (SEM). The Ag modified electrode had a high sensitivity of thecatalysis of nitrate, and the limt determination of NO3- is 0.035 mM (S/N = 3).3. MP-11/ Cysteamine /Au Modified Electrode.In this work, we have directly grown nanoporous Au film onto a GCE substrate using the templatetechnique. This newly designed material with a large surface area was used as a supporting matrix for immobilizing a redox protein, microperoxidase-11 (MP-11), to construct a novel microperoxidase-11(MP-11) biosensor for the determination of hydrogen peroxide (H₂O₂). Scanning electron microscope(SEM) and X-ray diffraction (XRD) were used to characterize the template of Cu and the nanoporous Aufilm. Cyclic voltammetry (CV) was used to characterize the performance of the biosensor on differentmodified electrodes. Also, the electrocatalytic activity of different process of the MP-11/ Cysteamine /Aumodified electrode toward O2 was investigated.