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The Fabrication and Application of the Preanodized Inlaying Ultrathin Carbon Paste Film Electrode

Author: ZhaoXiaoLing
Tutor: WangZhenHui
School: Henan Normal
Course: Analytical Chemistry
Keywords: pre-anodized inlaying ultra-thin carbon paste electrode cyclic voltammetry linear-sweep square wave voltammetry nichrome uric acid ascorbic acid dipyridmole acetaminophen
CLC: O657.1
Type: Master's thesis
Year: 2011
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Abstract


Carbon paste electrodes are the important components in electrochemical and electricity analyticalchemistry research. Carbon paste electrodes is made of a mushy mixture of conductive graphite powder andmixes the hydrophobic adhesive paste, which was embedded in the surface of substrate electrode or fillingtubes of electrode. The preparation of electrode was simple, cheap, non-toxic, selective, high sensitive andsmall volume. And it also has the advantage of surface updating easy,long service life and wide range ofpotential which is benefit for the electrochemical reaction of a test material in the potential area.But thesurface of traditional carbon paste electrodes is relatively loose, so stay analyte particles are tend to spreadto the internal through the electrode surface.Based on nichrome substrate electrode and using the method of embedded carbon paste, our studieslaunched as follow:Part one: Preparation and characterization of pre-anodized inlaying ultra-thin carbon paste electrodeTo form the ultra-thin carbon paste electrode about 100nm, nichrome were used as substrate material,in the surface of which ultra-thin carbon paste membrane was directly embedded.After the pre-anodizedprocessing, pre-anodized inlaying ultra-thin carbon paste film electrode was prepared. The electrode wascharacterized byscanning electron microscopy （SEM）, electrochemical impedance and circulationvoltammetric scanning with the solution of K4Fe（CN）6 being molecular probe. The resultants showselectrochemical performance and response sensitivity of the ultra-thin carbon paste electrode are greatlypromoted after pre-anodized processing and it can act as determined chemical electrode.Part two: Analysis and application pre-anodized inlaying ultra-thin carbon paste electrode1.The electrochemical test on the uric acid（UA） was tested in the PBS buffer solution of pH6.5 at150mV/s scanning speed using PAIUCPE as working electrode. Results demonstrate the electrode for UAhas good electrochemical response. Its oxidation peak current （Ip） and its concentration from the range of2.0×10-6mol/L to 2.0×10-4mol/L have linear relationship with detection limit being 1.1×10-8mol/L. Theelectrode is directly used for determination of the electrochemical UA owing to its reproducibility.2.The electrochemical analysis against ascorbic acid（AA） was tested in the NaAc-HAc buffer solution of pH 3.4 at 100mV/s scanning speed using PAIUCPE as working electrode.Experimental results show AAin this electrode has good electrical catalytic activity. Its oxidation peak current （Ip） and its concentrationfrom the range of3.0×10-6mol/L to 5.0×10-4mol/L have linear relationship with detection limit being1.38×10-6mol/L. Our experimental has established a rapid, highly sensitive electrochemical method of AAdetermination.3.The adsorption voltammetric behaviour of acetaminophen （ACOP） in the PAIUCPE potential areaand the influence of different conditions on the determination results were researched. Data show oxidationpeak current （Ip） and concentration of ACOP from the range of 1.0×10-7 mol/L～8.0×10-7mol/L to8.0×10-7 mol/L～8.0×10-4mol/L have linear relationship in the PBS buffer solution of pH 5.98 at 200mV/sscanning speed at starting potential 0.1V, with correlation coefficient respectively being 0.9963 and 0.9992and detection limit being 7.59×10-8mol/L.4.The electrochemical test against the dipyridmole was tested through cycle voltammetric andsquare-wave voltammetricusing PAIUCPE as working electrode. The electrode for dipyridmole hassensitive response. Dipyridmole wad determined in the pH4.33 buffer solution. in which kept open-circuitenrichment for 210s, setting 0V as its starting potential, at sweep speed of 150mV/s. Its oxidation peakcurrent （Ip） and its concentration from the range of 8×10-8 mol/L～6×10-7 mol/L and 1×10-6 mol/L～5×10-5 mol/L have linear relationship with correlation coefficient respectively being 0.9997 and 0.9985 anddetection limit being 5.6×10-8 mol/L. The fabrication of the electrode is easy and cheap. The electrodeagainst dipyridmole has good sensitivity, stability and selectivity and can directly used for electrochemicalanalysis on dipyridmole.

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