三种基于银纳米复合材料的过氧化氢电化学传感研究

发布时间：2019-01-01 12:08

【摘要】：银纳米复合材料由于其独特的物理、化学以及催化性能而在电化学传感研究领域得到广泛的应用。本论文主要使用水热法制备了三种不同形貌的银纳米复合材料,并构置相应的电化学传器,建立了三种检测过氧化氢(H202)的新方法。该研究丰富了H2O2电化学传感研究内容,一定程度上拓展了银纳米复合材料的应用范围。全文共分两章,主要研究内容如下:1.采用水热法和化学还原法制备了海胆状Ag/FeOOH纳米复合材料,并将其修饰在金(Au)电极表面构置一种电化学传感器,用于H202的检测。研究结果表明,银纳米粒子(Ag NPs)在海胆状FeOOH表面分布匀均,其负载量提高;且Ag/FeOOH/GCE对H202具有较好的催化作用;在0.03～15 mmol/L范围内,Ag/FeOOH/GCE对H202的催化电流与H202的浓度呈良好的线性关系(R=0.9996),检出限为11.8 μmol/L(S/N=3),响应时间为3s。2.采用表面活性剂辅助水热法制备了花状的Ag/FeS/PVP纳米复合材料,将其修饰在玻碳电极(GCE)表面构置了一种电化学传感器,并用于H202的检测。TEM研究结果表明,所制备的AgNPs的分散性好;电化学研究表明,在0.0775～72.8 mmol/L范围内,Ag/FeS/PVP/GCE对H202催化电流与H202的浓度呈良好的线性关系(R=0.9984),检出限为 23.6 μmol/L(S/N=3),灵敏度为 39.1 μAmmol-1 cm-2。3.采用化学法制备了 Ag/AlOOH/rGO,并基于此材料构置了一种新型的无酶H202传感器。TEM研究结果表明,AlOOH/rGO提高了 AgNPs的分散性与负载量;电化学研究结果表明,Ag/AlOOH/rGO/GCE有利于H202的电催化还原,该传感器对H2O2催化电流与H2O2的浓度在0.5 μumol/L～10.0 mmol/L范围内呈良好的线性关系(R=0.9997),检出限为 0.17 μunol/L(S/N=3),灵敏度为 80.1 μA mmol-1 cm-2。
[Abstract]:Silver nanocomposites have been widely used in electrochemical sensing due to their unique physical, chemical and catalytic properties. In this paper, three kinds of silver nanocomposites with different morphologies were prepared by hydrothermal method, and corresponding electrochemical transducers were constructed, and three new methods for the detection of hydrogen peroxide (H202) were established. This study enriches the research content of H2O2 electrochemical sensing and extends the application of silver nanocomposites to some extent. This paper is divided into two chapters, the main research contents are as follows: 1. Sea urchin Ag/FeOOH nanocomposites were prepared by hydrothermal method and chemical reduction method, and modified on the surface of gold (Au) electrode to construct an electrochemical sensor for the detection of H202. The results show that the silver nanoparticles (Ag NPs) are evenly distributed on the surface of urchin-like FeOOH, and their loading amount is increased, and Ag/FeOOH/GCE has a good catalytic effect on H202. In the range of 0.03 ~ 15 mmol/L, the catalytic current of Ag/FeOOH/GCE for H _ (202) has a good linear relationship with the concentration of H _ (202) (RV _ (0.9996), the detection limit is 11.8 渭 mol/L (S/N=3), and the response time is 3s. 2. The flower-like Ag/FeS/PVP nanocomposites were prepared by hydrothermal method assisted by surfactants. An electrochemical sensor was constructed on the (GCE) surface of glassy carbon electrode and was used for the detection of H202. The TEM results showed that, The prepared AgNPs has good dispersion. Electrochemical studies showed that the linear relationship between the catalytic current of Ag/FeS/PVP/GCE and the concentration of H202 was obtained in the range of 0.0775 渭 mol/L (72.8 mmol/L), and the detection limit was 23.6 渭 mol/L (S/N=3). Sensitivity 39.1 渭 Ammol-1 cm-2.3. Ag/AlOOH/rGO, was prepared by chemical method and a novel non-enzymatic H202 sensor was constructed based on this material. The results of TEM study show that AlOOH/rGO improves the dispersity and load of AgNPs. The electrochemical results showed that Ag/AlOOH/rGO/GCE was favorable to the electrocatalytic reduction of H202, and the linear relationship between the catalytic current of H2O2 and the concentration of H2O2 was in the range of 0.5 渭 umol/L~10.0 mmol/L (R _ (0.9997). The detection limit is 0.17 渭 unol/L (S/N=3) and the sensitivity is 80.1 渭 A mmol-1 cm-2..
【学位授予单位】：西北大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TB33;O657.1

【相似文献】