Construction And Application Of Electrochemical Sensors Based On Three Kinds Of Carbon-Nanocomposites Materials

Carbon-nanocomposites have many excellent physical and chemical properties, as the modified materials, which have the inestimable value in field of constructing electrochemical sensor. In this paper, three kinds of electrochemical sensors based on novel carbon-nanocomposites were fabricated and used for determination of nitrite. The relationship between the structure of carbon-nanocomposites and the electrochemical performance was studied. The study not only enrich the research contents of electrochemical sensors, but also broaden the scope of application of carbon-nanocomposites in electrochemistry. The full text was divided into two chapters, the author’s main contributions were as follows:1. CuS-MWCNTs nanocomposite was synthesized by hydrothermal co-precipitation method. The electrochemical sensors based on CuS-MWCNTs nanocomposites were fabricated and used for determination of nitrite. The results showed that the sensor has good catalytic effect nitrite in the linear range of 1.0×10-6～8.13×10-3 mol·L-1, the detection limit was 3.3×10-7 mol·L-1 (S/N=3) and the sensitivity was 131.2 μA·(mmol·L-1)-1·cm-2.2. Pt-PANI-GE nanocomposite was synthesized by chemical method, which was modified glassy carbon electrode (GCE) surface for determinating nitrite. Experimental results showed that the sensor could detect nitrite in a linear range of 4.0×10-7～9.91×10-4 mol·L-1 and 9.91 × 10-4～7.01×10-3 mol·L-1 respectively, the detection limit of the sensor was 1.3×10-7 mol·L-1 (S/N=3), the sensitivity were 485.5μA·(mmol·L-1)-1·cm-2 and 154.3 μA·(mmol·L-1)-1·cm-2 respectively. This research could provide a reference for the study of electrochemical sensing conductive graphene-based polymer nanocomposites.3. A new nanocomposite of Ag-FesO4-GO was synthesized and used for fabricating nitrite sensor. The result showed that the sensor could detect nitrite in a linear range of 5.0×10-7～0.72×10-3 mol·L-1 and 0.72×10-3～8.15 ×10-3 mol·L-1 respectively, the detection limit of the sensor was 1.7×10-7 mol·L-1 (S/N=3), the sensitivity were 1996 μA(mmol·L-1)-1·cm-2 and 426 μA·(mmol·L-1)-1·cm-2 respectively. This research could provide a reference for the study of electrochemical sensing based graphene oxide nanocomposites.