表面增强拉曼光谱研究稳定剂TAI在银上的吸附

用表面增强拉曼光谱的方法研究4－羟基－6－甲基－1，3，3a,7-四氮茚（TAI）在金属银上的吸附。实验表明TAI分子是通过分子上的N原子以化学吸附的方式吸附在银电极上。电极处理的氧化－还原循环次数并不影响振动频率，但在一定范围内对表面增强拉曼光谱的吸收强度有明显影响。     

芬太尼表面增强拉曼定性及定量分析可行性研究

以芬太尼为研究对象,运用显微共聚焦拉曼光谱及表面增强拉曼光谱对于芬太尼样品进行检测,对比这两种光谱特征吸收谱图,了解芬太尼的拉曼光谱特性。再优化表面增强拉曼光谱检测条件,在最优化条件下,对芬太尼的定量检测可行性进行研究,建立芬太尼表面增强拉曼光谱分析方法。     

Zn-Ni合金共沉积影响机理的拉曼光谱研究

首次利用现场表面增强拉曼光谱研究了Zn-Ni合金共沉积的机理。通过研究Ni电极在NiCl2溶液与纯水中的拉曼光谱、Ni电极与Au电极在KCl溶液中的拉曼光谱以及这2种电极在NiCl2溶液中现场电沉积的拉曼光谱,并根据前人提出的理论,得出如下结论:Zn-Ni合金共沉积中存在着较易在电极表面放电的NiClad,使Ni沉积的过电位降低,促进了Ni的沉积,导致Zn的异常共沉积。     

曲马多表面增强拉曼定性及定量分析可行性研究

本文以曲马多作为研究对象,运用显微共聚焦拉曼光谱及表面增强拉曼光谱对曲马多样品进行检测,对比这两种光谱特征吸收谱图,了解曲马多的拉曼光谱特性;再优化表面增强拉曼光谱检测条件,在最优化条件下,对曲马多的检出限及定量检测可行性进行研究,建立曲马多表面增强拉曼光谱分析方法。     

表面增强拉曼光谱基底研究进展

表面增强拉曼光谱(SERS)由于具有拉曼峰强、检测灵敏度高、能够无损分析等特点,在生物传感、表面吸附、储能、转化、文物等领域应用广泛,而制备出均匀分散并且高稳定性和重现性SERS基底是SERS技术的前提.对表面增强拉曼光谱技术的基底以及机理进行了综述.     

拉曼光谱的发展及应用

本文阐述了拉曼光谱产生的基本原理;介绍了拉曼光谱的发现、发展过程;讨论了表面增强拉曼光谱技术、高温拉曼光谱技术、共振拉曼光谱技术、共焦显微拉曼光谱技术和近年来在不同领域的应用及研究新进展.     

两种卟啉化合物在Ag溶胶表面的紫外－可见吸收光谱和表面增强拉曼散射光谱研究

两种卟啉化合物在Ａｇ溶胶表面的紫外－可见吸收光谱和表面增强拉曼散射光谱研究王传义,刘春艳,阎晓斌,何建军,张曼华,沈涛（中国科学院感光化学研究,北京１００１０１）关键词卟啉,Ａｇ溶胶,表面增强拉曼光谱,紫外吸收光谱表面增强拉曼散射（ＳＥＲＳ）自１９７...     

多级结构银微-纳米晶的制备及其性能

采用液相还原法,通过调控氧化剂硝酸银与还原剂抗坏血酸的摩尔比例制备出具有多级结构的花状及枝状银微-纳米晶,考察了反应介质对形貌及尺寸的影响。利用扫描电子显微镜（SEM）、X射线衍射仪（XRD）、表面增强拉曼光谱（SERS）、紫外-可见（UV-Vis）漫反射光谱等方法,对样品的形貌、微晶结构、光学及催化性能进行了研究。结果表明：花状及枝状多级结构银微-纳米晶均具有面心立方晶体结构,且（111）晶面为主要曝露晶面;表面增强拉曼光谱表明花状及枝状银微-纳米晶为基底时均表现出优异的表面增强拉曼效应;微结构上的差异使枝状银在紫外-可见漫反射光谱上352 nm处有较强的吸收峰;在银催化硼氢化钠还原4-硝基苯酚的实验中,多级结构枝状银表现出最优良的催化活性。     

表面增强拉曼光谱定量分析技术几种方法的探讨

表面增强拉曼光谱(SERS)技术增强了拉曼光谱的检测信号和灵敏度,拓宽了拉曼光谱在实际中的应用范围.因SERS技术具有现场快速分析等优点,被应用于农药、医药、环境、食品等领域的定量检测.但SERS在实际分析过程中,存在再现性欠佳、信号易受实验测试条件和基底干扰等因素而限制了其发展,其定量分析技术仍亟待提高和完善.阐述了...     

异烟肼表面增强拉曼光谱优化方法研究

本文以在毒杀宠物狗案件中常见的药物异烟肼为研究对象,使用表面增强拉曼光谱研究其快速检测的方法。运用不同合成途径的纳米金作为表面增强试剂,对比不同浓度氯化钠、溴化钠和碘化钾作为助剂对比表面增强效果,确定异烟肼表面增强分析的最佳条件。     

Fourier-transform surface enhanced Raman scattering studies of molecular self-assembly of disulfides on metals and the application in adhesion promotion

The adsorption and molecular orientation of phenyl disulfide and 4-aminophenyl disulfide on silver surface has been investigated by the use of Fourier transform (FT) surface enhanced Raman scattering (SERS). There is a concentration dependence of the molecular orientation of adsorbed disulfides on silver surface. Disulfides could be adsorbed on Ag surface as self-assembled, well oriented monolayers from a very dilute solution. The amino group exposed outwards on the 4-aminophenyl disulfide adsorbed on metal can take part in chemical reactions with epoxy group. Modification at the interface has been achieved for polymer/metal systems by using 4-aminophenyl disulfide as a coupling agent, resulting in adhesion promotion.     

Shell-isolated nanoparticle-enhanced Raman spectroscopy of pyridine on smooth silver electrodes

The invention of shell-isolated nanoparticle-enhanced Raman spectroscopy (SHINERS) extends the study of Raman spectroscopy into surface electrochemistry on the SERS-inactive smooth electrodes. This work aims to investigate the electrochemical system perturbation brought about by spreading Au–core silica–shell nanoparticles (Au@SiO₂ NPs) over the electrode surface for SHINERS. The differential capacitance measurements have shown SHINERS to cause the minimum of disturbance in the electrochemical system. The spectral features of SHINERS of pyridine adsorbed at smooth silver electrodes differs from that of SERS on the electrochemically roughened surface because pyridine interacts with silver much more strongly on the roughened electrode with many heterogeneous adsorption sites. Since most electrochemical data about surface adsorption are based on mechanically polished surface, the spectral information provided by the in situ SHINERS could be more reliable and better correlation.     

Electrochemical and surface-enhanced Raman spectroscopy studies of 4-phenylpyridine adsorption at the gold/solution interface

The adsorption of 4-phenylpyridine (4-PhPy) on the Au electrode was examined using conventional electrochemical techniques: cyclic voltammetry and impedance measurements and also by surface enhanced Raman spectroscopy (SERS) in a wide range of electrode potentials. Electrochemical results indicate the strong adsorption of 4-Phpy molecules, particularly at the positively charged Au electrode. The wide shoulder of capacity close to the pzc suggests that the composition and/or the structure of 4-Phpy monolayer change with the sign of the surface charge on the electrode. Investigation of integrity of adsorbed layer, however, indicates that adsorbed molecules do not form tight, compact monolayer even in the case of adsorption from saturated solution. SERS spectra provided evidence for gradual, potential-induced reorientation of the molecular plane with respect to the surface, from nearly vertical in the negatively charged electrode, to more flat at the positively charged metal surface.     

吡啶-氯化钾水溶液/n型硫化镉电极界面上的表面增强喇曼散射

本文研究了在吡啶-KC1水溶液中吡啶吸附在n-CdS电极上的表面增强喇曼散射(SERS)。在光照下,CdS电极经过正极化予处理数分钟,就能观察到吡啶吸附在CdS电极上的很强的SERS谱。其特征峰是1010和1036cm~(-1)与纯吡啶的喇曼特征峰991,1030cm~(-1)相比有了明显位移。又SERS谱随着吡啶浓度的增加而增强。外加电位对SERS也有一定影响,其曲线形状与CdS的I～V曲线很相似。对这些实验结果,本文用n型CdS电极的光电化学特性进行了初步的考察和讨论。     

Determination of the Molecular Structure of Interphases Between Epoxy/4,4'-Diaminodiphenylsulfone Adhesives and Silver Substrates Using SERS and XPS

The molecular structure of interphases formed by curing an epoxy/4,4'-diaminodiphenylsulfone (DADPS) adhesive against rough silver substrates was determined using surface-enhanced Raman scattering (SERS) and x-ray photoelectron spectroscopy (XPS). SERS spectra obtained from the adhesive deposited onto silver island films were very similar to SERS spectra obtained from the DADPS curing agent spun onto silver island films, indicating that DADPS in the adhesive system segregated to the interphase and was preferentially adsorbed onto the silver substrate. Differences in the relative intensity of several bands in the normal Raman and SERS spectra of DADPS were observed. For example, the band near 1603 cm^-1 was stronger in SERS spectra of DADPS than in normal Raman spectra. The band near 1150 cm^-1 was weaker in SERS spectra of DADPS than in normal Raman spectra. These results implied that DADPS was adsorbed through one of the NH groups with an end-on conformation. Consistent results were also obtained from XPS spectra. C(ls) spectra of the adhesive and silver fracture surfaces of specimens prepared by curing the adhesive against silver substrates were more similar to the C(ls) spectra of DADPS than to those of the bulk adhesive. These results confirmed the preferential adsorption of DADPS onto the silver substrate from the adhesive system. The similarity of the C(ls) spectra obtained from adhesive and silver fracture surfaces indicated that a thin DADPS-rich interphase was formed between the bulk adhesive and the silver substrate and that the locus of failure was partially within this layer. However, less nitrogen and sulfur were detected on the silver fracture surface than on the adhesive fracture surface. A large amount of silver was observed on the substrate fracture surface and a trace was found on the adhesive fracture surface. These results indicated that failure of the adhesive joints was within the interphase but near the silver substrate. No evidence of chemisorption of DADPS onto the substrate was observed.     

活性炭纤维表面结构及其吸附银机理研究

用Ｘ射线光电子能谱（ＸＰＳ）等分析方法对剑麻基碳化纤维、磷酸化学活化纤维及其热处理纤维吸附Ａｇ＋前后的表面结构进行了研究,结果表明：活性炭纤维的氧化还原吸附性能不与其比表面积成正比,而受表面官能团影响很大,且还原吸附的纳米银与纤维的界面间除相互的物理作用外,还有Ａｇ－Ｏ－Ｃ配位键合存在;纤维还原能力强,但负载的纳米银与载体纤维之间的相互作用力并不一定大,而活化作用使纤维表面的Ｏ物种利于Ａｇ的成核和成键,促进Ａｇ－Ｏ－Ｃ的形成,使负载上的纳米银较稳定。     

An electrochemical and SERS study of benzyldimethylphenylammonium chloride at a polycrystalline gold electrode

The adsorption behaviour of benzyldimethylphenylammonium chloride (BDMPAC) on polycrystalline gold has been investigated by means of dc (cyclic voltammetry) and ac electrochemical techniques (differential capacitance (DC), electrochemical impedance spectroscopy) and in-situ vibrational spectroscopy (surface enhanced Raman spectroscopy (SERS)). The adsorption of this quaternary ammonium salt is found to be mediated by specifically adsorbed chloride ions in the potential domain positive to the pzc; when chloride ions are expelled from the compact layer out of electrostatic reasons, BDMPAC adsorbs interacting directly with the metal surface through one of its aromatic rings. In accordance with the DC results, SERS show a reorientation of the molecule around −200 mV versus Ag/AgCl.     

A SERS spectroelectrochemical investigation of the interaction of 2-mercaptobenzothiazole with copper, silver and gold surfaces

The interaction of the sulfide mineral flotation collector, 2-mercaptobenzothiazole, with silver, copper and gold surfaces has been investigated by surface enhanced Raman scattering (SERS) spectroscopy. 2-mercaptobenzothiazole, the copper, silver and gold compounds of this species, and the dithiolate, 2,2-dithiobis(benzothiazole) were characterised by ¹³C NMR and Raman spectroscopy to provide a basis for identifying surface species. SERS investigations showed that, at pH 4.6 where the solution species is in the protonated form, and at 9.2, where it is present as the ion, adsorption on each metal occurs over a wide potential range. Attachment of the organic compound occurs through bonding between the exocyclic sulfur atom and metal atoms in the surface. X-ray photoelectron spectroscopy confirmed that the adsorbed layer was of monolayer thickness. Adsorption of the protonated 2-mercaptobenzothiazole occurs on copper at pH 4.6 at potentials below that at which charge transfer adsorption commences.