基于金属氧化物的电化学传感器的构建及其分析应用
发布时间：2018-07-29 15:49
【摘要】：纳米金属氧化物是很有潜力的一种纳米材料,具有成本廉价、比表面积大、能量带隙宽、催化性能好等特点,其被广泛地应用于气体传感器、光催化、锂离子电池、超级电容器和电化学传感器等领域。石墨烯是一种导电性很好的片层结构的碳材料,常被作为基底材料,但其分散性和溶解性不佳,所以人们利用功能化方法来改善这一缺点。本论文中,我们以十二烷基硫酸钠(SDS)和聚苯乙烯磺酸钠(PSS)功能化的石墨烯为基底材料,将三种不同的纳米金属氧化物负载在石墨烯(GN)的表面,通过结合二者各自的优异性质以及之间的协同作用,构筑了三种电化学传感器,研究了修饰电极的性能并对药物和偶氮类色素进行了分析检测,最后,成功地应用于实际样品的检测。1.SDS-GN/SnO_2修饰电极的构建及对瑞香素的检测本实验,我们通过一步合成法制备了SDS-GN/SnO_2复合材料,该复合材料对瑞香素的电化学信号有显著地提高。我们用紫外光谱法、红外光谱法、X射线衍射法以及透射电镜表征了该复合材料,用循环伏安法(CV)和差示脉冲伏安法(DPV)对瑞香素进行定量检测。在最佳条件下,瑞香素的氧化峰电流与其浓度呈正比关系,得到的线性范围分别是0.03-1.0和1.0-8.0μmol L~(-1),检测限为0.008μmol L~(-1)。本实验构筑的瑞香素电化学传感器对比其他传感器具有更高的灵敏度,并且成功地应用于检测祖师麻中的瑞香素,得到了满意的结果。2.PSS-GN/WO_3修饰电极的构建及对葛根素的检测本实验,我们通过简单超声将已经制备好的PSS-GN和WO_3纳米棒混合均匀,制备了PSS-GN/WO_3修饰材料,其中WO_3纳米棒不仅能增大比表面积还能够增加材料的溶解性。基于该材料,我们构筑了葛根素电化学传感器。由于PSS-GN和WO_3之间的协同作用以及各自的优异性质,该修饰材料对葛根素的氧化活性具有显著的改善作用,并能提高该传感器的灵敏度。我们用CV和线性扫描伏安法(LSV)定量测定了葛根素,在最佳条件下,葛根素的氧化峰电流与其浓度呈正比关系,得到的线性范围分别是0.06-0.6和0.6-6.0μmol L~(-1),检测限为0.04μmol L~(-1)。本实验构筑的葛根素电化学传感器具有高的灵敏度,并且成功地应用于检测血浆中的葛根素,得到了满意的结果。3.PSS-GN/Co_3O_4修饰电极的构建及对苋菜红的检测本实验,我们采用简单绿色的水热法制备了PSS-GN/Co_3O_4复合材料,其中Co_3O_4纳米簇大大地增加了材料的比表面积。基于此复合材料,我们构筑了苋菜红电化学传感器,该传感器对苋菜红的检测信号有明显地提升。我们用多种表征手段对该复合材料进行表征,并用CV和LSV对苋菜红进行了定量地测定,在最佳条件下,苋菜红的氧化峰电流与其浓度呈正比关系,得到的线性范围分别是0.01-1.0和1.0-6.0μmol L~(-1),检测限为0.004μmol L~(-1)。本实验构筑的苋菜红电化学传感器具有高的灵敏度,并且成功地应用于检测饮料中的苋菜红,得到了满意的结果。通过以上纳米金属氧化物和功能化石墨烯之间的协同作用,我们成功地构筑了相应的电化学传感器并用以分析应用。本论文进一步证明了纳米金属氧化物在电化学检测上的优异性能,拓宽了其应用范围。
[Abstract]:Nano metal oxide is a kind of potential nano material with high cost, large surface area, wide band gap and good catalytic performance. It is widely used in the fields of gas sensors, photocatalysis, lithium ion batteries, supercapacitors and electrochemical sensors. Graphene is a very conductive layer structure. Carbon materials are often used as base materials, but their dispersivity and solubility are poor, so people use functionalized methods to improve this defect. In this paper, we use twelve alkyl sodium sulfate (SDS) and polystyrene sulfonate (PSS) functionalized graphene as the base material to load three different nano metal oxides in graphene (GN). On the surface, three electrochemical sensors were constructed by combining the excellent properties of the two and the synergistic effect between them. The properties of the modified electrodes were studied and the drugs and azo pigments were analyzed. Finally, the construction of the.1.SDS-GN/SnO_2 modified electrode and the detection of daphin were successfully applied to the actual samples. In this experiment, SDS-GN/SnO_2 composites were prepared by one step synthesis method. The electrochemical signal of Daphne was significantly improved. The composite was characterized by ultraviolet spectroscopy, infrared spectroscopy, X ray diffraction and transmission electron microscopy, and Daphne was used by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). Under the optimum conditions, the peak current of the oxidation peak of Daphne is directly proportional to its concentration, and the linear range is 0.03-1.0 and 1.0-8.0 mol L~ (-1), and the detection limit is 0.008 u mol L~ (-1). A satisfactory result of the construction of the.2.PSS-GN/WO_3 modified electrode and the testing of Ge Gensu was obtained. We have prepared the PSS-GN and WO_3 nanorods prepared by simple ultrasound to prepare the PSS-GN/WO_3 modifier, in which the WO_3 nanorods not only increase the specific surface area, but also increase the specific surface area. The solubility of the material. Based on this material, we constructed a puerarin electrochemical sensor. Due to the synergy between PSS-GN and WO_3 and their excellent properties, the modified material has a significant improvement in the oxidation activity of Ge Gensu, and can improve the sensitivity of the sensor. We use CV and Linear Scanning Voltammetry (LSV) to quantify. The oxidation peak current of Puerarin was directly proportional to its concentration and the linear range was 0.06-0.6 and 0.6-6.0 mol L~ (-1), and the detection limit was 0.04 u mol L~ (-1). The sensitivity of the puerarin electrochemical sensor constructed in this experiment was high, and it was successfully applied to the determination of Pueraria lobata in plasma. We obtained satisfactory results in the construction of.3.PSS-GN/Co_3O_4 modified electrodes and the testing of amaranth. We used a simple green hydrothermal method to prepare PSS-GN/Co_3O_4 composites, in which the Co_3O_4 nanoclusters greatly increased the specific surface area of the materials. Based on this composite, we constructed a electrochemical sensor for amaranth. The sensor has improved the detection signal of amaranth. We use a variety of characterization methods to characterize the composite, and quantitative determination of amaranth with CV and LSV. Under the best conditions, the peak current of amaranth oxidation is proportional to its concentration, and the linear range is 0.01-1.0 and 1.0-6.0 mol L~ (- 1) the detection limit of the detection limit is 0.004 mol L~ (-1). The amaranth electrochemical sensor constructed in this experiment has high sensitivity and has been successfully applied to the detection of amaranth in the beverage. Sensilla are used to analyze applications. This paper further demonstrates the excellent performance of nano metal oxides in electrochemical detection and widens their application.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O657.1
[Abstract]:Nano metal oxide is a kind of potential nano material with high cost, large surface area, wide band gap and good catalytic performance. It is widely used in the fields of gas sensors, photocatalysis, lithium ion batteries, supercapacitors and electrochemical sensors. Graphene is a very conductive layer structure. Carbon materials are often used as base materials, but their dispersivity and solubility are poor, so people use functionalized methods to improve this defect. In this paper, we use twelve alkyl sodium sulfate (SDS) and polystyrene sulfonate (PSS) functionalized graphene as the base material to load three different nano metal oxides in graphene (GN). On the surface, three electrochemical sensors were constructed by combining the excellent properties of the two and the synergistic effect between them. The properties of the modified electrodes were studied and the drugs and azo pigments were analyzed. Finally, the construction of the.1.SDS-GN/SnO_2 modified electrode and the detection of daphin were successfully applied to the actual samples. In this experiment, SDS-GN/SnO_2 composites were prepared by one step synthesis method. The electrochemical signal of Daphne was significantly improved. The composite was characterized by ultraviolet spectroscopy, infrared spectroscopy, X ray diffraction and transmission electron microscopy, and Daphne was used by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). Under the optimum conditions, the peak current of the oxidation peak of Daphne is directly proportional to its concentration, and the linear range is 0.03-1.0 and 1.0-8.0 mol L~ (-1), and the detection limit is 0.008 u mol L~ (-1). A satisfactory result of the construction of the.2.PSS-GN/WO_3 modified electrode and the testing of Ge Gensu was obtained. We have prepared the PSS-GN and WO_3 nanorods prepared by simple ultrasound to prepare the PSS-GN/WO_3 modifier, in which the WO_3 nanorods not only increase the specific surface area, but also increase the specific surface area. The solubility of the material. Based on this material, we constructed a puerarin electrochemical sensor. Due to the synergy between PSS-GN and WO_3 and their excellent properties, the modified material has a significant improvement in the oxidation activity of Ge Gensu, and can improve the sensitivity of the sensor. We use CV and Linear Scanning Voltammetry (LSV) to quantify. The oxidation peak current of Puerarin was directly proportional to its concentration and the linear range was 0.06-0.6 and 0.6-6.0 mol L~ (-1), and the detection limit was 0.04 u mol L~ (-1). The sensitivity of the puerarin electrochemical sensor constructed in this experiment was high, and it was successfully applied to the determination of Pueraria lobata in plasma. We obtained satisfactory results in the construction of.3.PSS-GN/Co_3O_4 modified electrodes and the testing of amaranth. We used a simple green hydrothermal method to prepare PSS-GN/Co_3O_4 composites, in which the Co_3O_4 nanoclusters greatly increased the specific surface area of the materials. Based on this composite, we constructed a electrochemical sensor for amaranth. The sensor has improved the detection signal of amaranth. We use a variety of characterization methods to characterize the composite, and quantitative determination of amaranth with CV and LSV. Under the best conditions, the peak current of amaranth oxidation is proportional to its concentration, and the linear range is 0.01-1.0 and 1.0-6.0 mol L~ (- 1) the detection limit of the detection limit is 0.004 mol L~ (-1). The amaranth electrochemical sensor constructed in this experiment has high sensitivity and has been successfully applied to the detection of amaranth in the beverage. Sensilla are used to analyze applications. This paper further demonstrates the excellent performance of nano metal oxides in electrochemical detection and widens their application.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O657.1
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