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：2018-01-01 20:43

本文关键词：基于银纳米复合材料的过氧化氢电化学传感研究　出处：《西北大学》2016年硕士论文　论文类型：学位论文

【摘要】：银具有良好的导电能力和催化性能,广泛应用于电化学传感研究。本论文主要制备了三种银纳米复合材料,分别构置了基于这些材料的过氧化氢(H_2O_2)电化学传感器,探索了H_2O_2浓度、银纳米复合材料与电化学响应之间的关系,建立了检测H_2O_2新方法。该研究丰富了电化学传感的研究内容,拓展了银纳米复合材料的应用范围。全文共分为四章,作者的主要贡献如下：1、通过化学合成法制备了Ag/Cu_2O,构置了基于Ag/Cu_2O的H_2O_2电化学传感器,探索了Ag/Cu_2O的组成和电催化性能及其与H_2O_2电化学响应之间的关系。TEM研究结果表明,Ag颗粒较为均匀地分布在Cu20立方体表面；电化学结果显示,Ag/Cu_2O对H_2O_2具有较好的催化作用,传感器的催化电流与H_2O_2的浓度在2.0×10-6 mol·L-1 1.3×10-2 mol·L-1范围内呈良好的线性关系(R=0.9995),检出限为7.0×10-7mol·L-1(S/N= 3),灵敏度为88.9μA(mmol·L-1)-1cm-2,响应时间为3s。2、通过先成核后生长的的方式将Ag纳米颗粒还原到Fe_3O_4表面,制备了Ag/Fe_3O_4,构置了基于Ag/Fe_3O_4的H_2O_2电化学传感器,探索了Ag/Fe_3O_4的组成和电催化性能及其与H_2O_2电化学响应之间的关系。实验结果显示,Ag/Fe_3O_4对H_2O_2的催化性能优于Fe_3O_4、 Ag等材料,传感器对H_2O_2的检测线性范围为5.0×10-7mol·L-1～4.0×10-3mol·L-1(R= 0.9998),检出限为2.0×10-7mol·L-1(S/N=3),灵敏度为135.4μA(mmol·L-1)-1cm-2。与其他方法相比,该传感器具有检出限低、灵敏度高的优点。3、制备了核壳结构的Fe_3O_4@PPy/Ag,构置了基于Fe_3O_4@PPy/Ag的H_2O_2电化学传感器,探索了Fe_3O_4@PPy/Ag的组成和电催化性能及其与H_2O_2电化学响应之间的关系。TEM研究结果表明,合成的材料为核壳结构,Ag颗粒尺寸均一,分散性好；电化学研究结果表明,该传感器的催化电流与H_2O_2的浓度在5.0×10.6 mol·L-1～1.2×10-2 mol·L-1范围内呈良好的线性关系(R=0.9976),检出限为1.7×10-6mol·L-1(S/N=3),灵敏度为18.2μA(mmol·L-1)-1cm-2。该研究可为其他壳核结构纳米复合材料的制备与应用提供借鉴。
[Abstract]:Silver has good conductivity and catalytic performance, and it is widely used in electrochemical sensing. In this paper, three kinds of silver nanocomposites were prepared. Electrochemical sensors were constructed based on these materials, respectively. The relationship between the concentration of H _ 2O _ 2, Ag nanocomposites and electrochemical response was explored. A new method for the detection of H _ 2O _ 2 was established, which enriched the research content of electrochemical sensing and expanded the application of silver nanocomposites. The paper is divided into four chapters, the main contributions of the author are as follows: 1. AgP / CuS _ 2O was prepared by chemical synthesis, and the H2O-2 electrochemical sensor based on Ag/Cu_2O was constructed. The relationship between the composition and electrocatalytic activity of Ag/Cu_2O and the electrochemical response of H _ 2O _ 2 / s _ 2 was investigated. The Ag particles are uniformly distributed on the surface of the Cu20 cube. The electrochemical results show that Ag-P / CuS _ 2O has a good catalytic effect on H2O-2. The catalytic current of the sensor has a good linear relationship with the concentration of H _ 2O _ 2 in the range of 2.0 脳 10 ~ (-6) mol 路L ~ (-1) 1.3 脳 10 ~ (-2) mol 路L ~ (-1). RV 0.9995). The detection limit was 7.0 脳 10 ~ (-7) mol 路L ~ (-1) C ~ (-1), the sensitivity was 88.9 渭 A ~ (-1) mmol 路L ~ (-1) 路L ~ (-1) cm ~ (-2), and the response time was 3s.2. The Ag nanoparticles were reduced to the surface of Fe_3O_4 by nucleation and then growth, and Ag/Fe_3O_4 was prepared. The Hs _ 2O _ 2 electrochemical sensor based on Ag/Fe_3O_4 was constructed. The relationship between the composition and electrocatalytic performance of Ag/Fe_3O_4 and the electrochemical response of H _ 2O _ 2 / s _ 2 was investigated. The catalytic activity of Ag/Fe_3O_4 for H _ 2O _ 2 is better than that for Fe3O _ (4), Ag and other materials. The linear range of the sensor for the detection of H _ 2O _ 2 was 5.0 脳 10 ~ (-7) mol 路L ~ (-1) and 4.0 脳 10 ~ (-3) mol 路L ~ (-1) 路L ~ (-1) (R = 0.9998). The detection limit was 2.0 脳 10 ~ (-7) mol 路L ~ (-1) and the sensitivity was 135.4 渭 A ~ (-1) mmol 路L ~ (-1) ~ (-1) cm ~ (-2). The sensor has the advantages of low detection limit and high sensitivity. A core-shell structure Fe_3O_4@PPy/Ag has been prepared. The Hs _ 2O _ 2 electrochemical sensor based on Fe_3O_4@PPy/Ag was constructed. The relationship between the composition and electrocatalytic activity of Fe_3O_4@PPy/Ag and the electrochemical response of H _ 2O _ 2 was investigated. The results showed that the synthesized material was core-shell structure. The size of Ag particles is uniform and the dispersity is good. The electrochemical results show that. The catalytic current of the sensor has a good linear relationship with the concentration of H _ s _ 2O _ 2 in the range of 5.0 脳 10.6 mol 路L ~ (-1) and 1.2 脳 10 ~ (-2) mol 路L ~ (-1). RV 0.9976). The detection limit was 1.7 脳 10 ~ (-6) mol 路L ~ (-1) S / N ~ (3). The sensitivity is 18.2 渭 Am ~ (-1) mmol 路L ~ (-1) 路L ~ (-1) cm ~ (-2). This study can be used as a reference for the preparation and application of other core nanocomposites.
【学位授予单位】：西北大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：O657.1

【相似文献】