L－B技术在电化学研究中的应用

l-b技术可在分子水平上按人们的预想控制分子的排列和取向，是实现分子工程的重要手段。国内外l-b技术的研究主要集中于仿生膜、特殊材料和信息器件，新开拓的电化学应用有导电材料、光电材料、电催化作用、传感器、钝化作用和反应模板等福建省自然科学基

L-B膜技术在电化学研究中的应用

学位：理学硕士院系专业：化学化工学院化学系_物理化学(含化学物理)学号：1993450

The Applications of POAP Ni 2+ Films ModiFied Electrode as Sensor For Alcohol

POAP-nI2＋膜电极对乙醇氧化表现出优越的电催化活性.乙醇氧化电流受到膜厚、膜中镍离子浓度、活化时间、电解质PH值及温度等条件的影响.选择合适的条件，可得到乙醇浓度与响应电流的线性关系.POAP-nI2＋可构成较理想的乙醇传感器，其线性范围、检测下限、响应时间及抗干扰能力等主要特征参数均达到实用要求POAP Ni 2+ Films modiFied electrode can electrocatalyzes signiFicantly the oxidation of alcohol.the modiFied electrode can be used as the electrochemical sensor For the detection of alcohol.But the oxidation of alcohol is eFFected by the thickness of Films、the concentration of nickel ion in Films、pH of electrolyte,as well as temperative.All of those conditions have been studied in order to achieve stable response current during the oxidation of alcohol, and the relation between concentration and current has been made.At last the major characteristic parameters, such as the low limitation of concentration、the response time、the ability of antiinterFerence et al,have been discussed

聚苯胺Langmuir－Blodgett膜的电聚合制备及电化学性质

在加有苯胺的亚相上，铺展硬脂酸分子，在气液界面上可形成苯胺－硬脂酸Ｌａｎｇｍｕｉｒ膜．随膜压增大至５．０×１０￣（－６）Ｎ时，苯胺与硬脂酸间的氢键会发生重排，形成另外一种构型的Ｌａｎｇｍｕｉｒ膜，分子所占面积减小，膜增加一个苯环的厚度．将膜转移到ＳｎＯ＿２导电玻璃基底上，制成硬脂酸－苯胺Ｌａｎｇｍｕｉｒ－Ｂｌｏｇｄｅｔｔ膜，经电化学氧化，苯胺可聚合成薄膜。膜夹在两层硬脂酸分子间，它的电化学行为不仅受到离子膜中传输过程的影响，同时受到硬脂酸极性亲水端（－ＣＯＯ￣－）的作用

The Applications of POAP Ni 2+ films Modified Electrode as Sensor for Alcohol

ＰＯＡＰ－Ｎｉ２＋膜电极对乙醇氧化表现出优越的电催化活性．乙醇氧化电流受到膜厚、膜中镍离子浓度、活化时间、电解质ｐＨ值及温度等条件的影响．选择合适的条件，可得到乙醇浓度与响应电流的线性关系．ＰＯＡＰ－Ｎｉ２＋可构成较理想的乙醇传感器，其线性范围、检测下限、响应时间及抗干扰能力等主要特征参数均达到实用要求POAP Ni 2+ films modified electrode can electrocatalyzes significantly the oxidation of alcohol. the modified electrode can be used as the electrochemical sensor for the detection of alcohol. But the oxidation of alcohol is effected by the thickness of films、the concentration of nickel ion in films、pH of electrolyte,as well as temperative. All of those conditions have been studied in order to achieve stable response current during the oxidation of alcohol, and the relation between concentration and current has been made. At last the major characteristic parameters, such as the low limitation of concentration、the response time、the ability of antiinterference et al,have been discussed.作者联系地址：固体表面物理化学国家重点实验室　厦门大学化学系Author's Address: Department of Chemistry of Xiamen University, State Key Laboratory for Phycial Chemistry of the Solid Surface, Xiamen 36100

Fabrication and Electrochemical Behaviors of Thin Films of Polyaniline by Langmuir-Blodgett Technique and Electropolymerization

在加有苯胺的亚相上，铺展硬脂酸分子，在气液界面上可形成苯胺－硬脂酸Ｌａｎｇｍｕｉｒ膜．随膜压增大至５．０×１０￣（－６）Ｎ时，苯胺与硬脂酸间的氢键会发生重排，形成另外一种构型的Ｌａｎｇｍｕｉｒ膜，分子所占面积减小，膜增加一个苯环的厚度．将膜转移到ＳｎＯ＿２导电玻璃基底上，制成硬脂酸－苯胺Ｌａｎｇｍｕｉｒ－Ｂｌｏｇｄｅｔｔ膜，经电化学氧化，苯胺可聚合成薄膜。膜夹在两层硬脂酸分子间，它的电化学行为不仅受到离子膜中传输过程的影响，同时受到硬脂酸极性亲水端（－ＣＯＯ￣－）的作用．Hydrogen-bond between stearic acid and aniline in subphase lead to Langmuirmonotayers of stearic acid-aniline,the molecular area of stearic acid-aniline is 26 nm￣2.With surfacepressure increased into 50 mN/M,the hydrogen-bond would be rearranged ,aniline moleculartransales into vertical from horizontal,surface pressure decreased quickly. A new kind of Langmuirmonolayer is formed instead of collapse,it's molecular area decreases into 24 nm￣2 and thicknessincreases with 0.25 nm. After electroreduction of L-B films depeited onto the surface ofSnO_2 electrode ,anilne layers between two stear acid matix could be polymerized into thin films ofpolyanilne.The structu re of thin films has ben studied by small angle X-ray scattering.Theelectrochemical properties of such thin films are very different from the films of polyaniline preparedby others methods.It's properties is not only effected by the proceed of ion transport,also by thehydrophilic grounp(-COO￣-)of stearic acid.作者联系地址：厦门大学化学系，厦门大学固体物理化学表面国家重点实验室, 北京理工大学化工与材料学院Author's Address: Department of Chemistry of Xiamen University,State Key Laboratory for Physical Chemistry of the Solid Surface,Xiamen 361005Zhang YunhongUniversity of Science and Technology Beijing,Beijing10008

Electrocatalytic Oxidation of Methanol on the Stearate Nickel L B Film

硬脂酸镍Ｌ－Ｂ膜电极对甲醇具有良好的电催化作用．膜中镍离子主要以－ＣＯＯＮｉ（ＯＨ）形式存在．电催化过程受ＯＨ－浓度的影响，也涉及甲醇分子在膜内的穿透．The stearate nickel L B films is good electroacatlyst for the oxidation of methanol MeOH in alkaline. The electrochemical behaviors of stearate nickel L B films is affected by the concentration of KOH. The rate of quantity of mickel ion and stearic acid in L B films is 1∶1, which means that the nickel ion may exist in -COONi(OH) form. The electrocatalytic process is influenced by the concentration of OH - , it involves the penetration of MeOH into the films. The oxidative currents of MeOH are linearly dependent on the bulk concentration.作者联系地址：固体表面物理化学国家重点实验室厦门大学化学系,北京理工大学化工与材料学院Author's Address: Dept. of Chem., Xiamen Univ., State Key Lab. for Phy. Chem. of the Solid Surf., Xiamen361005 Zhang Yanhong Univ. of Sci. and Tech. Beijing, Beijing 10008

L-B膜内银超微粒子的电化学制备及表征

在8～14层硬脂酸银L-B膜内,用电化学还原法制备了纳米尺度的银超微粒子,实验表明,银超微粒子的形成是观察多层L-B膜高分辨STM图象的必要条件,利用STM技术不仅观察到8层L-B膜的六方排列的硬脂酸脂链结构,还直接观察到2～3nm直径的球形银超微粒子结构;首次报道L-B膜亲水层原子尺度的网状STM图象,该图象显示了脂链六方的(2×1)结构,是羧基之间由氢键自组织的结果;银超微粒子有很强的表面增强Raman散射效应,由此测得了两层L-B膜在1100～1200cm ~1范围的Raman光谱,为从分子水平认识两层L-B膜的有序性提供了实验基础