Fabrication,Characterization And Electrochemical Studies Of Ag And Au Nanoparticles Modified Electrode

In the thesis, self-assembled monolayers (SEMs) of organomereaptans confined to Au surfaces were studied with electrochemical methods and scanning electron micrograph (TEM). And SEMs is modified by Au nanoparticles, so nanogold modified Au electrode can be obtained and can be used to study interface electrochemistry. There are four aspect of content as follows.1. Nanosilver modified Au electrode is fabricated by pulsed potentiostatic reduction. Ag+ is grafted on an ordered 2-aminothane-thiol monolayer at Au surface. Ag nanoparticles can be obtained through pulsed potentiostatic reduction.2. Nanogold and nanoplatinum sol was characterized with TEM and Malvern 3000HS Zeta Size. The 2D structure formed by dithiols and gold nanoparticles was observed with TEM.3. The preparation of density-controlled gold nano-particles modified electrodes can be fabricated, which have the properties of nano-electrode array. The electrode were studied and characterized by electrochemical methods and TEM. .The ferricyanide redox couple was used as a marker to probe the interface. An electrochemistry interface with a tunable kinetic barrier can be acquired by the use of the property that Au-S bond can be formed between nanogold and thiol. In addition, the capacity at the solution/electrode interface was obtained with two methods.4. The micro-environment at electrode interface can be changed by modifying different substances, and so the property of the electrode can be changed. The chargeof the electrode interface can be changed by modifying thioctic acid and 4,4'-bis(methanethiol)biphenyl (MTP) and changing the pH of solution. The electrochemistry of ferricyanide redox reaction was used as a marker to probe the interface and the peak is influenced .