基于金屬氧化物的電化學傳感器的構(gòu)建及其分析應用
發(fā)布時間：2018-07-29 15:49
【摘要】：納米金屬氧化物是很有潛力的一種納米材料,具有成本廉價、比表面積大、能量帶隙寬、催化性能好等特點,其被廣泛地應用于氣體傳感器、光催化、鋰離子電池、超級電容器和電化學傳感器等領(lǐng)域。石墨烯是一種導電性很好的片層結(jié)構(gòu)的碳材料,常被作為基底材料,但其分散性和溶解性不佳,所以人們利用功能化方法來改善這一缺點。本論文中,我們以十二烷基硫酸鈉(SDS)和聚苯乙烯磺酸鈉(PSS)功能化的石墨烯為基底材料,將三種不同的納米金屬氧化物負載在石墨烯(GN)的表面,通過結(jié)合二者各自的優(yōu)異性質(zhì)以及之間的協(xié)同作用,構(gòu)筑了三種電化學傳感器,研究了修飾電極的性能并對藥物和偶氮類色素進行了分析檢測,最后,成功地應用于實際樣品的檢測。1.SDS-GN/SnO_2修飾電極的構(gòu)建及對瑞香素的檢測本實驗,我們通過一步合成法制備了SDS-GN/SnO_2復合材料,該復合材料對瑞香素的電化學信號有顯著地提高。我們用紫外光譜法、紅外光譜法、X射線衍射法以及透射電鏡表征了該復合材料,用循環(huán)伏安法(CV)和差示脈沖伏安法(DPV)對瑞香素進行定量檢測。在最佳條件下,瑞香素的氧化峰電流與其濃度呈正比關(guān)系,得到的線性范圍分別是0.03-1.0和1.0-8.0μmol L~(-1),檢測限為0.008μmol L~(-1)。本實驗構(gòu)筑的瑞香素電化學傳感器對比其他傳感器具有更高的靈敏度,并且成功地應用于檢測祖師麻中的瑞香素,得到了滿意的結(jié)果。2.PSS-GN/WO_3修飾電極的構(gòu)建及對葛根素的檢測本實驗,我們通過簡單超聲將已經(jīng)制備好的PSS-GN和WO_3納米棒混合均勻,制備了PSS-GN/WO_3修飾材料,其中WO_3納米棒不僅能增大比表面積還能夠增加材料的溶解性�；谠摬牧�,我們構(gòu)筑了葛根素電化學傳感器。由于PSS-GN和WO_3之間的協(xié)同作用以及各自的優(yōu)異性質(zhì),該修飾材料對葛根素的氧化活性具有顯著的改善作用,并能提高該傳感器的靈敏度。我們用CV和線性掃描伏安法(LSV)定量測定了葛根素,在最佳條件下,葛根素的氧化峰電流與其濃度呈正比關(guān)系,得到的線性范圍分別是0.06-0.6和0.6-6.0μmol L~(-1),檢測限為0.04μmol L~(-1)。本實驗構(gòu)筑的葛根素電化學傳感器具有高的靈敏度,并且成功地應用于檢測血漿中的葛根素,得到了滿意的結(jié)果。3.PSS-GN/Co_3O_4修飾電極的構(gòu)建及對莧菜紅的檢測本實驗,我們采用簡單綠色的水熱法制備了PSS-GN/Co_3O_4復合材料,其中Co_3O_4納米簇大大地增加了材料的比表面積�；诖藦秃喜牧�,我們構(gòu)筑了莧菜紅電化學傳感器,該傳感器對莧菜紅的檢測信號有明顯地提升。我們用多種表征手段對該復合材料進行表征,并用CV和LSV對莧菜紅進行了定量地測定,在最佳條件下,莧菜紅的氧化峰電流與其濃度呈正比關(guān)系,得到的線性范圍分別是0.01-1.0和1.0-6.0μmol L~(-1),檢測限為0.004μmol L~(-1)。本實驗構(gòu)筑的莧菜紅電化學傳感器具有高的靈敏度,并且成功地應用于檢測飲料中的莧菜紅,得到了滿意的結(jié)果。通過以上納米金屬氧化物和功能化石墨烯之間的協(xié)同作用,我們成功地構(gòu)筑了相應的電化學傳感器并用以分析應用。本論文進一步證明了納米金屬氧化物在電化學檢測上的優(yōu)異性能,拓寬了其應用范圍。
[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.
【學位授予單位】：鄭州大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：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.
【學位授予單位】：鄭州大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：O657.1
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