本文關(guān)鍵詞： 聚甲基丙烯酸二甲氨基乙酯 多壁碳納米管 多孔碳材料 四氧化三鐵 電化學(xué)傳感器　出處：《湘潭大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：環(huán)境響應(yīng)型聚合物聚甲基丙烯酸二甲氨基乙酯(PDMAEMA),其結(jié)構(gòu)中既含有親水性的叔胺基和羰基,又含有疏水性的烷基基團(tuán),在酸性介質(zhì)中可以被質(zhì)子化,因而它具有一定的pH值敏感性和溫敏性等環(huán)境剌激響應(yīng)的特性。有關(guān)PDMAEMA及其嵌段共聚物的合成已經(jīng)研究得比較多,但是基于PDMAEMA與無機(jī)功能材料結(jié)合起來的復(fù)合材料研究的不多,尤其是基于PDMAEMA的復(fù)合材料的電化學(xué)研究。因此本論文提出基于PDMAEMA復(fù)合材料的制備并研究其相關(guān)電化學(xué)性能的構(gòu)思,主要研究?jī)?nèi)容如下:(1)含PDMAEMA的二嵌段共聚物聚環(huán)氧乙烷-b-聚甲基丙烯酸二甲氨基乙酯(PEO-b-PDMAEMA)結(jié)合多壁碳納米管(MWCNTs)的復(fù)合材料對(duì)亞硝酸鈉(NaNO2)電催化研究:將二嵌段共聚物PEO-b-PDMAEMA與MWCNTs結(jié)合組成復(fù)合材料修飾于玻碳電極上(記為PEO-b-PDMAEMA/MWCNTs/GCE),構(gòu)建了一種用于測(cè)定亞硝酸鹽的無酶電化學(xué)傳感器。實(shí)驗(yàn)研究了PEO-b-PDMAEMA溫敏性對(duì)該傳感器性能的影響。隨著溶液溫度的上升,PEO-b-PDMAEMA/MWCNTs/GCE對(duì)亞硝酸鹽氧化的電催化作用增強(qiáng)。該傳感器顯示出對(duì)亞硝酸鹽濃度較寬的線性檢測(cè)范圍(1.0×10-6至1.0×10-4 M),低的檢測(cè)限(1.0×10-6 M)和高的靈敏度(562.16μA/mM·cm2)以及良好的穩(wěn)定性和重復(fù)性。(2)基于聚合物PDMAEMA的多孔碳材料(NC)的制備及其對(duì)氧氣的電催化:因?yàn)镻DMAEMA中含有C和N元素,以PDMAEMA為碳源和氮源,以KOH為活化物質(zhì),采用高溫煅燒法將聚合物PDMAEMA熱解成為含氮的多孔碳材料(NC)。研究了有無KOH和不同煅燒溫度對(duì)于材料制備的影響。采用掃描電鏡(SEM)、X射線衍射儀(XRD)和比表面積分析儀對(duì)所制備的多孔碳材料進(jìn)行了表征。結(jié)果顯示,NC具有蜂巢狀的多孔結(jié)構(gòu)、高達(dá)954 m2/g的比表面積和12.7wt.%的含氮量。實(shí)驗(yàn)發(fā)現(xiàn)NC修飾的電極對(duì)陰極氧還原反應(yīng)(Oxygen Reduction Reaction,ORR)有較高的電催化活性、優(yōu)異的循環(huán)穩(wěn)定性和良好的抗甲醇性能。(3)基于聚合物PDMAEMA制備碳包覆磁性納米四氧化三鐵(C/Fe3O4)復(fù)合材料及其對(duì)雙氧水(H2O2)的電催化:采用SEM、EDS、XRD等方法對(duì)該復(fù)合物的形貌進(jìn)行了表征。實(shí)驗(yàn)表征發(fā)現(xiàn)C/Fe3O4為粒徑在340 nm左右的球形納米顆粒,具有良好的導(dǎo)電性能。C/Fe3O4修飾的玻碳電極對(duì)H2O2具有良好的電催化活性和低的檢測(cè)限(3.8×10-7M),以及優(yōu)異的抗干擾性、穩(wěn)定性和重現(xiàn)性。
[Abstract]:The environmental responsive polymer PDMAEMAA contains hydrophilic tertiary amine and carbonyl groups as well as hydrophobic alkyl groups. Because it can be protonated in acid medium, it has some characteristics of pH sensitivity and temperature sensitivity. The synthesis of PDMAEMA and its block copolymers has been studied. However, the research of composite materials based on PDMAEMA and inorganic functional materials is not much. Especially the electrochemical study of composites based on PDMAEMA. Therefore, this paper proposed the preparation of PDMAEMA composites and the related electrochemical properties. The main contents of this study are as follows: (1) PDMAEMA diblock copolymer poly (ethylene oxide-b-poly (dimethylamino ethyl methacrylate)-PEO-b-PDMAEMAE). The effect of multiwalled carbon nanotubes (MWCNTs) on sodium nitrite (NaNO2). Electrocatalytic study: the composite material composed of diblock copolymer PEO-b-PDMAEMA and MWCNTs was modified on glassy carbon electrode (. Recorded as PEO-b-PDMAEMA / MWCNTs / GCE. An enzymatic electrochemical sensor for the determination of nitrite was constructed. The effect of PEO-b-PDMAEMA temperature sensitivity on the performance of the sensor was studied. The electrocatalytic effect of PEO-b-PDMAEMA/MWCNTs/GCE on nitrite oxidation was enhanced. The sensor showed a wide linear detection range for nitrite concentration (. From 1.0 脳 10 ~ (-6) to 1.0 脳 10 ~ (-4) M). Low detection limit of 1.0 脳 10 ~ (-6) M) and high sensitivity of 562.16 渭 A / mm 路cm ~ (2) and good stability and repeatability. Preparation of porous carbon material based on polymer PDMAEMA and its electrocatalysis for oxygen: because PDMAEMA contains C and N elements. PDMAEMA was used as carbon and nitrogen source and KOH as activator. The polymer PDMAEMA was pyrolyzed into a porous carbon material containing nitrogen by high temperature calcination. The effects of KOH and different calcination temperature on the preparation of the material were studied by scanning electron microscope (SEM). SEM). The porous carbon materials were characterized by X-ray diffractometer (XRD) and specific surface area analyzer. The specific surface area of 954 m2 / g and the nitrogen content of 12.7 wt.% were obtained. Oxygen Reduction Reaction. ORR) has high electrocatalytic activity. C / Fe _ 3O _ 4 / C / Fe _ 3O _ 4 / C / Fe _ 3O _ 4 / C / Fe _ 3O _ 4 / C / Fe _ 3O _ 4 / C / Fe _ 3O _ 4 / C / Fe _ 3O _ 4 / C / Fe _ 3O _ 4 composites. The electrocatalysis of H _ 2O _ 2 was carried out by SEM. The morphology of the composite was characterized by EDS- XRD. It was found that C / Fe _ 3O _ 4 was spherical nanoparticles with a diameter of about 340 nm. The glassy carbon electrode modified with C / Fe _ 3O _ 4 has good electrocatalytic activity for H2O2, low detection limit of 3.8 脳 10 ~ (-7) MN, and excellent anti-interference. Stability and reproducibility.
【學(xué)位授予單位】：湘潭大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TB332

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本文編號(hào)：1469832