【摘要】：銀納米復合材料由于其獨特的物理、化學以及催化性能而在電化學傳感研究領域得到廣泛的應用。本論文主要使用水熱法制備了三種不同形貌的銀納米復合材料,并構置相應的電化學傳器,建立了三種檢測過氧化氫(H202)的新方法。該研究豐富了H2O2電化學傳感研究內容,一定程度上拓展了銀納米復合材料的應用范圍。全文共分兩章,主要研究內容如下:1.采用水熱法和化學還原法制備了海膽狀Ag/FeOOH納米復合材料,并將其修飾在金(Au)電極表面構置一種電化學傳感器,用于H202的檢測。研究結果表明,銀納米粒子(Ag NPs)在海膽狀FeOOH表面分布勻均,其負載量提高;且Ag/FeOOH/GCE對H202具有較好的催化作用;在0.03～15 mmol/L范圍內,Ag/FeOOH/GCE對H202的催化電流與H202的濃度呈良好的線性關系(R=0.9996),檢出限為11.8 μmol/L(S/N=3),響應時間為3s。2.采用表面活性劑輔助水熱法制備了花狀的Ag/FeS/PVP納米復合材料,將其修飾在玻碳電極(GCE)表面構置了一種電化學傳感器,并用于H202的檢測。TEM研究結果表明,所制備的AgNPs的分散性好;電化學研究表明,在0.0775～72.8 mmol/L范圍內,Ag/FeS/PVP/GCE對H202催化電流與H202的濃度呈良好的線性關系(R=0.9984),檢出限為 23.6 μmol/L(S/N=3),靈敏度為 39.1 μAmmol-1 cm-2。3.采用化學法制備了 Ag/AlOOH/rGO,并基于此材料構置了一種新型的無酶H202傳感器。TEM研究結果表明,AlOOH/rGO提高了 AgNPs的分散性與負載量;電化學研究結果表明,Ag/AlOOH/rGO/GCE有利于H202的電催化還原,該傳感器對H2O2催化電流與H2O2的濃度在0.5 μumol/L～10.0 mmol/L范圍內呈良好的線性關系(R=0.9997),檢出限為 0.17 μunol/L(S/N=3),靈敏度為 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..
【學位授予單位】：西北大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TB33;O657.1

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