Preparation,Characterization,Electrochemical Simulation And Application Of Single Au Nanoelectrode

The application of electrochemical equipment firstly appeared at late 1950 s and the usage of Functional Amplifier was a new thing at that time.The rapid developments of electro-chemical theory start from 1960 s,people obtained certain physical and chemical data by describing the changing of current when the current pass though the reactant.Cyclic Voltammetry is later become one of the most popular methods in research area.By using the triangular-wave voltage within certain potential,researchers come to realize some certain phenomenon,such as mass-tranport phenomenon,electro-chemical reactions,reversible reactions and so on.Nowadays,nanoscaled electro-chemistry provided lots of useful information for us which were totally unavailable before.On one hand,nano materials(metal particles or semi-conductor particles),have unique physical and chemical property,so that they can be used to built new electro-chemical materials.On the other hand,the usage of nanoelectrodes can help us investigating super fast electron transfer kinetics properties.What's more,taking nanoscaled electrodes as the probes,one can get the unique properties between electrodes and solution surface.The dissertation included the following chapters:Chapter I: The introduction to nanoelectrodes,COMSOL simulation,data fitting,and the detection of biomacromolecules by Time of First Arrival method.Chapter II: Using laser-assisted pulling technology,we fabricated Au nanodisk electrodes and Au nanowire electrodes,we characterised them with different sizes by using ferrocene and finite element simulation.Finally,Butler-Volmer equation was used to fit the cyclic voltammetry curves.Chapter III: The Au nanopore electrodes was fabricated on the basis of Au nanodisk electrodes,we obtained them by etching the nanodisk electrodes in solution.Then the nanopore electrodes were used to detect biomacromolecules and their electrochemical signals in solution,which was further confirmed by Particle Tracing Model in simulations.Chapter IV: We detect the TNT moleculars by using the Au nanodisk electrodes modified with p-aminothiophenol moleculars,the p-aminothiophenol increased the sensitivities of electrochemical detection.Again,the Au nanodisk electrodes were used to observe and record the electrochemical signals towards ferritin moleculars,and then the Edge Effect was confirmed by computer simulations.Chapter V: We modified Pt-Pd alloy nanoparticles on the surface of glass carbon electrodes covered with graphene,cyclic voltammetry curves were used to investigate its ability in catalytic oxidizing methanol and oxalic acid,the I-T curves confirmed its ability in anti-poisoning and its electrochemical activity in catalytic oxidizing methanol.