Preparation Of Functionalized Carbon-based Nanocomposites And Their Applications In Electrochemical Sensor

Carbon nanomaterial is a kind of nanomaterial which mainly composes of carbon atoms.Due to its unique structure,carbon nanomaterial possesses a series of special physical and chemical properties which include large surface areas,high electrical conductivity and reactivity,good stability etc.Therefore,the carbon nano-material has been widely used in catalytic material,energy reserves,environmental governance,biomedicine,biosensor and other fields.In this paper,graphene oxide and carbon nanotube as basic materials and designs different experimental methods to prepare functionalized carbon-based nanocomposites of different kinds which applied in electrochemical sensor.The main contents are as follows:?1?In this chapter,the 3D flower-like CuO/reduced graphene oxide?CuO/rGO?nanocomposite were prepared via hydrothermal method,and SEM,TEM,Raman,XRD,FT-IR and XPS were employed to characterize the as-prepared materials.The obtained materials were utilized to modify the electrodes for constructing the acetaminophen biosensor,the experiment results show that,the CuO/rGO modified electrode for detecting the acetaminophen has excellent electric-catalytic ability,and exhibits a wide linear range from 3.0 to 500.0?mol L^-1,the detection limit was 0.19?mol L^-1?S/N=3?.Moreover,this biosensor was used for detecting acetaminophen in real samples with satisfactory results.?2?In this chapter,the different morphology of the 3D flower-like copper/zinc nano-metal compound oxide were successfully synthesized via hydrothermal method,Further,the experiment take CNT-COOHs and GO as support for preparing the CuO-ZnO/CNT/r-GO nanocomposite,the as-prepared materials were analyzed by SEM,EDS and XRD.The electrochemical impedance spectroscopy,cyclic voltammetry and differential pulse voltammetry were utilized to study the electrochemical performance of the CuO-ZnO/CNT/r-GO nanocomposite,the experimental results show that,the hybrid modified electrode for detecting the dopamine and acetaminophen displays excellent electro-catalysis ability,under the optimal conditions,selective detection of dopamine and acetaminophen in a linear concentration range of 0.1 to 150.0?mol L^-1 and 1.0 to 700.0?mol L^-1were obtained,respectively,and the detection limit were 0.03?mol L^-1 and 0.15?mol L^-1?S/N=3?.Moreover,this biosensor exhibits excellent selectivity,high sensitivity,good stability and reproducibility,and regarding the detection of the real samples with satisfactory results.?3?In this chapter,the 3D flower-like CuO-ZnO nano-metal compound oxide and CuO-ZnO/carbon nanotube nanocomposite?CuO-ZnO/r-CNT?were prepared via microwave-assistant technique,respectively,the SEM,TEM,FT-IR and XRD were utilized to characterize the as-prepared materials.The CuO-ZnO/r-CNT nanocomposite was used to modify the electrodes,and then applied to the detection of acetaminophen,,the experimental results show,the hybrid modified electrode for detecting the acetaminophen has excellent electroredox ability,the oxidation peak current versus the concentration of acetaminophen exhibits a good linear range of 0.2to 20.0?mol L^-1 and 20.0 to 700.0?mol L^-1,respectively,the detection limit was 0.08?mol L^-1?S/N=3?.Moreover,the proposed biosensor was used for detecting acetaminophen samples with satisfactory results.