本文關(guān)鍵詞：基于銀納米復(fù)合材料的過氧化氫電化學(xué)傳感研究　出處：《西北大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 電化學(xué)傳感器 電催化 納米復(fù)合材料 銀 過氧化氫

【摘要】：銀具有良好的導(dǎo)電能力和催化性能,廣泛應(yīng)用于電化學(xué)傳感研究。本論文主要制備了三種銀納米復(fù)合材料,分別構(gòu)置了基于這些材料的過氧化氫(H_2O_2)電化學(xué)傳感器,探索了H_2O_2濃度、銀納米復(fù)合材料與電化學(xué)響應(yīng)之間的關(guān)系,建立了檢測(cè)H_2O_2新方法。該研究豐富了電化學(xué)傳感的研究內(nèi)容,拓展了銀納米復(fù)合材料的應(yīng)用范圍。全文共分為四章,作者的主要貢獻(xiàn)如下：1、通過化學(xué)合成法制備了Ag/Cu_2O,構(gòu)置了基于Ag/Cu_2O的H_2O_2電化學(xué)傳感器,探索了Ag/Cu_2O的組成和電催化性能及其與H_2O_2電化學(xué)響應(yīng)之間的關(guān)系。TEM研究結(jié)果表明,Ag顆粒較為均勻地分布在Cu20立方體表面；電化學(xué)結(jié)果顯示,Ag/Cu_2O對(duì)H_2O_2具有較好的催化作用,傳感器的催化電流與H_2O_2的濃度在2.0×10-6 mol·L-1 1.3×10-2 mol·L-1范圍內(nèi)呈良好的線性關(guān)系(R=0.9995),檢出限為7.0×10-7mol·L-1(S/N= 3),靈敏度為88.9μA(mmol·L-1)-1cm-2,響應(yīng)時(shí)間為3s。2、通過先成核后生長的的方式將Ag納米顆粒還原到Fe_3O_4表面,制備了Ag/Fe_3O_4,構(gòu)置了基于Ag/Fe_3O_4的H_2O_2電化學(xué)傳感器,探索了Ag/Fe_3O_4的組成和電催化性能及其與H_2O_2電化學(xué)響應(yīng)之間的關(guān)系。實(shí)驗(yàn)結(jié)果顯示,Ag/Fe_3O_4對(duì)H_2O_2的催化性能優(yōu)于Fe_3O_4、 Ag等材料,傳感器對(duì)H_2O_2的檢測(cè)線性范圍為5.0×10-7mol·L-1～4.0×10-3mol·L-1(R= 0.9998),檢出限為2.0×10-7mol·L-1(S/N=3),靈敏度為135.4μA(mmol·L-1)-1cm-2。與其他方法相比,該傳感器具有檢出限低、靈敏度高的優(yōu)點(diǎn)。3、制備了核殼結(jié)構(gòu)的Fe_3O_4@PPy/Ag,構(gòu)置了基于Fe_3O_4@PPy/Ag的H_2O_2電化學(xué)傳感器,探索了Fe_3O_4@PPy/Ag的組成和電催化性能及其與H_2O_2電化學(xué)響應(yīng)之間的關(guān)系。TEM研究結(jié)果表明,合成的材料為核殼結(jié)構(gòu),Ag顆粒尺寸均一,分散性好；電化學(xué)研究結(jié)果表明,該傳感器的催化電流與H_2O_2的濃度在5.0×10.6 mol·L-1～1.2×10-2 mol·L-1范圍內(nèi)呈良好的線性關(guān)系(R=0.9976),檢出限為1.7×10-6mol·L-1(S/N=3),靈敏度為18.2μA(mmol·L-1)-1cm-2。該研究可為其他殼核結(jié)構(gòu)納米復(fù)合材料的制備與應(yīng)用提供借鑒。
[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.
【學(xué)位授予單位】：西北大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：O657.1

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