扫描电化学显微技术

本文着重介绍了扫描电化学显微技术（SECM）的工作原理、仪器构造和测量方法，简要地评述了SECM在电化学研究及表面微加工等方面的应用及发展前景。国家自然科学基金;福建省自然科学基

Preface Special Issue in Honor of Professor Zhaowu Tian on His 90Birthday

The Journal of Electrochemistry is proud to publish this Special Issue Honoring Professor Zhaowu Tian,on the occasion of his 90birthday,for his enormous contributions to and far-reaching impact in the field of electrochemistry

Au(111)/咪唑基离子液体界面结构研究:阳离子侧链长度的影响

本文结合电化学方法与原子力显微镜力曲线技术,研究了两种烷基侧链长度不同的离子液体BMITFSA和OMITFSA在Au(111)电极表面附近的层状结构的数目和耐受力对电位的依赖性,探究了烷基侧链长度变化对界面层状结构的影响.研究表明,不同烷基侧链长度的离子液体体系力-电位曲线形状基本相似.在零电荷电位(the potential of zero charge,PZC)附近时,力值最小,因为此时电极表面荷电量较小,层状结构不稳定;电位偏离PZC的过程中,第一层层状结构力值呈现先增大后减小的趋势.受到烷基侧链所处的不同位置影响,在PZC电位以负,短侧链离子液体的层状结构稳定性较好,而PZC电位以正,长侧链离子液体的稳定性较好.国家自然科学基金项目(No.21673193);;福建省自然科学基金项目(No.2016J01075)资

Electrochemical preparation and AFM characterization of gold nanoparticles on HOPG

[中文文摘]本文以高序石墨为基底 ,氯金酸溶液为支持电解质 ,以对表面破坏力小的轻敲模式原子力显微镜为观察手段 ,研究基底的表面状态及电沉积条件对形成的纳米颗粒尺寸和形态的影响 ,并简要讨论所形成的金纳米粒子的表面Raman增强效应和对乙二醇氧化的电催化效应.[英文摘要]We present a study on the electrochemical preparation of Au nanoparticles on HOPG from HAuCl 4 solution characterized by tapping mode AFM. It has been shown that deposition on activated HOPG and non activated HOPG follows progressive and instantaneous nucleation and growth mode, respectively. The size and morphology of the nanoparticles depends on the deposition condition. Au nanoparticles of narrow size distribution of～50 nm can be prepared which has a tendency to arrange into a two dimensional order on homogeneous HOPG (nonactivated). The electrocatalytic properties and SERS properties of the Au nanoparticles are briefly discussed.自然科学基金资助项目(No：29833060

紫外辐射诱导C_(60)聚合的扫描隧道显微研究

C60 molecule was adsorbed on the Au(111)surface and irradiated with UV light.The coalescence under the UV radiation was followed by STM in situ. According to the STMobservation, the coalesced products have larger cages and finally form a film

A potential-pulse interference method for studies of the nucleation of a single silver centre on carbon microelectrodes

A potential-pulse interference method has been developed for detailed studies of the nucleation at a single nucleus. Following a potential step from a positive overpotential to a sufficiently negative overpotential at which nucleation takes place, a single reverse pulse or repetitive potential-pulse train is then applied at certain stage before a critical nucleus is formed to interfere with the nucleation process. Nucleation is then allowed to continue at a stable overpotential until a critical nucleus is formed. By comparing the arrival-time distributions of the critical nuclei with and without the pulse interference, information about the mechanism of the nucleation can be obtained. In particular, it is found that a termination process is involved in the formation of a single silver nucleus at medium and low potentials, and that the structures of the critical nuclei may be different at different overpotentials

Preparation of Freestanding Bilayer Lipid Membranes and the Effect of Temperature on Their Mechanical Properties

结合聚苯乙烯球刻蚀和微机电系统技术加工氮化硅纳米多孔膜,并在其上用囊泡法制备非支撑磷脂双层膜,通过温控原子力显微术(AfM)的成像模式和力曲线模式对非支撑磷脂双层膜的形貌和力学性质进行研究.实验结果表明,该方法制备的非支撑磷脂双层膜具有流动性,能进行自我修复,该特点有利于提供足够的非支撑磷脂双层膜区域用于其性质研究;非支撑磷脂双层膜的膜破力和粘滞力均随着温度的升高而减小,即膜的机械稳定性随着温度的升高而降低.非支撑磷脂双层膜膜破力小于支撑磷脂双层膜的膜破力,并且非支撑磷脂双层膜粘滞力随温度的变化趋势与支撑磷脂双层膜的变化趋势相反.Nanoporous silicon nitride membranes are fabricated by combining polystyrene colloidal lithography with Micro-Electro-Mechanical Systems, and then freestanding bilayer lipid membranes are constructed across the nanopores by the vesicle method.The topography and mechanical properties of the freestanding bilayer lipid membranes are investigated using the imaging and force curve modes of variable-temperature atomic force microscopy (AFM).The fluidity and self-repair of the freestanding bilayer lipid membranes are observed by AFM, which gives enough freestanding area for further investigations.Force curve measurements demonstrate that both breakthrough and adhesion forces decrease as the temperature increases; i.e., the mechanical stability of freestanding bilayer lipid membranes decreases as the temperature rises.The breakthrough force of freestanding bilayer lipid membranes is smaller than that of supported membranes.Moreover, the adhesion force of freestanding bilayer lipid membranes varies in the opposite manner to that of supported membranes.福建省自然科学基金(2012J01054); 国家自然科学基金(21021002); 中央高校基本科研业务费专项资金(2012121026)资助项目~

DNA修饰电极的研究——Ⅶ.共价键合和吸附DNA-SAM/Au修饰电极的制备及表征

采用先通过 2 ,2′ 二硫二乙醇自组装得到自组装单分子层 (SAM) ,再在SAM上共价键合和吸附固定dnA的方法制备了两类dnA修饰电极 ,并对得到的dnA修饰电极进行了电化学和谱学表征 .结果表明该方法是可行的 ,也是较为理想的在电极表面固定dnA的方法 .国家自然科学基金!(批准号:39370213;39770220;29773034);厦门大学固体表面物理化学国家重点实验室基金;湖北省自然科

Probing electrode/electrolyte interfacial structure in the potential region of hydrogen evolution by Raman spectroscopy

The detailed interfacial structure in the potential region of severe hydrogen evolution, to date, is far from clear due to lack of both experimental data and correlated theoretic models. It has been shown that it is possible to surmount, to some extent, the disturbance of the spectroelectrochemical measurement by strong hydrogen bubbling in the potential region of severe hydrogen evolution by using a surface enhancement effect and a thin-layer cell configuration. Using this approach, we have obtained surface enhanced Raman scattering (SERS) spectra of water at an Ag electrode at very negative potentials at various concentrations of NaClO4. To explain the abnormal reversal of the peak intensity ratio of the bending to the stretching vibration, a preliminary model of the electrode/electrolyte interface is presented. The water molecule is oriented with one hydrogen attached to the surface and the oxygen towards an adsorbed cation which is partially dehydrated owing to the very strong electrostatic force. Raman spectra of hydrogen bound at a Pt electrode in solutions of varying pH from 0 to 14 at potentials of mild hydrogen evolution have also been presented for the first time. The spectra reveal that the Pt-hydrogen interaction is influenced by both the potential and the interfacial structure. These primary studies may initiate more molecular-level research of electrochemical interfaces in the potential region of hydrogen evolution

STUDY ON THE PROCESS of COPPER ELECTRODEPOSITION ON PLATINUM (111)

采用0.001MOl/lCuSO4＋0.5MOl/lH2SO4溶液体系，在PT单晶球电极作循环伏安曲线，得到Cu存在欠电位沉积和本体沉积两个阶段，利用电化学扫描隧道显微镜观察到在欠电位下Cu在PT（111）面上为单层平面生长，本体沉积为三维岛状生长，并随过电位升高，Cu的成核数目增加.用反射电子显微镜法也观察到高过电位时在PT（111）面上的岛状铜.证实了Cu在PT（111）面上的STrAnSkI—krASTAnOV生长机理C-V curves of copper electrodeposition on Pt(111) showed that there were two stages of underpotential and bulk deposition For copper electrodeposition process.Single layer growth at underpotential deposition and three dimensional nucleation growth at bulk deposition had been in situ observed by electrochemical scanning tunneling microscopy (ECSTM) at diFFerent potentials and times.The reFlection electron microscopy (REM) images also revealed three dimensional growth of Cu deposition at high overpotential.All of these results demonstrated Stranski-Krastanov growth mechanism of copper on Pt(111).国家自然科学基金!59471060;厦门大学固体表面物理化学国家重点实验室、中国科学院原子核分析研究室资