| The carbon fiber fabric is a novel carbon-based material with the specialty of soft voice and a tight fist, which possesses intrinsic flexibility, favorable chemical stability, high conductivity and 3D structure with multiple porous channels. By virtue of its inherent physical and chemical properties, the carbon fiber fabric has been extensively employed in the fields of lithium ion batteries, sensors, supercapacitors, and etc, and it can be directly fabricated into freestanding electrode. The synergistic effect of the nanostructured arrays with large specific surface area and carbon fabric with porous channels, is beneficial to improve electron transfer rate in the electrochemical test and stability of the device. Therefore, metal oxides/hydroxides and carbon fabric composites were studied to structure the novel flexible non-enzymatic electrochemical biosensors,which provide a scientific method for various complicated circumstances such as clinical diagnosis, food safety inspection, environmental pollutants detection and etc.In this thesis, we have respectively synthesized CuO nanoflower arrays, MnO2 nanorod arrays and MnOOH nanorod arrays on carbon fabric substrates, and conducted a systematic study on nanostructured arrays tailoring, characterization of nanoscale materials, fabrication and performance of the novel flexible non-enzymatic electrochemical biosensors based on nanostructured arrays. The main research contents and results are as follow:(1) Flexible nonenzymatic glucose sensor based on carbon fabric-supported CuO nanoflower arraysCarbon fabric-supported CuO nanoflower arrays have been synthesized at 100?by hydrothermal method, which has not been reported yet. The structure, element,morphology and size of CuO nanoflowers are characterized by XRD, EDS and FESEM.The results indicate that the surface of carbon fibers are covered by the CuO nanoflowers which consist of CuO nanorod aggregates with an average rod diameter of~ 10 nm.Carbon fabric-supported CuO nanoflower arrays can be directly fabricated into freestanding flexible electrode without binder, and the as-prepared electrode has been employed to detect the glucose level by electrochemical measurements. The carbon fabric-supported CuO nanoflower arrays electrode has an excellent electrocatalytic activity toward the direct oxidation of glucose with a high sensitivity of 6476.0 ?AmM-1cm-2 and a wide linear range between 0.02~9.67 mM, which is mainly ascribed to the synergistic effect of the nanostructured arrays and carbon fabric. Furthermore, the fabricated sensor has a better long-term stability and selectivity. It provides a simple method for the noveldesign of flexible non-enzymatic biosensors based on carbon fabric.(2)Flexible nonenzymatic glucose sensor based on carbon fabric-supported MnO2 nanorod arraysMnOOH nanorod arrays growing on carbon fabric have been prepared firstly at160 ? by hydrothermal synthesis, and then through annealing treatment for 2 h at300?, monoclinic MnOOH nanorod arrays have been transformed into tetragonal MnO2 nanorod arrays. By this simple method, the carbon fabric-supported MnO2 nanorod arrays have been successfully prepared. The results indicate that the surface of carbon fibers are covered by the MnO2 nanorods with 100~200 nm in diameter and 5~10 ?m in length by FESEM and TEM.Carbon fabric-supported MnO2 nanorod arrays can be directly fabricated into freestanding flexible electrode, and the as-fabricated electrode has been employed to determination of glucose concentration by electrochemical measurements. The carbon fabric-supported MnO2 nanorod arrays electrode has an excellent electrocatalytic activity toward the direct oxidation of glucose with a high sensitivity of 1650.6 ?A mM-1cm-2, a wide linear range between 2.5 ?M~3.96 mM, better stability and selectivity.It provides a simple novel method for the design of flexible non-enzymatic biosensors based on carbon fabric.(3)Flexible nonenzymatic H2O2 sensor based on carbon fabric-supported MnOOH nanorod arraysThe carbon fabric-supported MnOOH nanorod arrays have been synthesized firstly at 160 ? by hydrothermal process. And the results reveal that MnOOH nanorods uniformly grow on the outer surface of the carbon fabric and the nanorods are with the diameter of 100~200 nm and the length of 5~10 ?m.The carbon fabric-supported MnOOH nanorod arrays can be directly fabricated into freestanding flexible electrode, and the as-prepared electrode has been employed to detect H2O2 concentration by electrochemical measurements. The as-fabricated electrode has an excellent electrocatalytic activity toward the direct reduction of H2O2 with a high sensitivity of 692.42 ?A mM-1cm-2. Furthermore, the fabricated sensor has a better long-term stability and selectivity. |
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