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在以电化学方法确认L-半胱氨酸对铜-锌超氧化物歧化酶(copper,zinc superoxide dis-mutase,SOD)在金丝电极上的电子迁移过程起促进作用的基础上,本文论述了将拉曼光谱电化学方法应用于猪红细胞SOD在经L-半胱氨酸修饰的金丝电极上的金电极上的电化学行为的现场拉曼光谱研究。研究结果从分子水平上提供了有关L-半胱氨酸修饰在金电极上的电化学过程中,以及SOD在L-半胱氨酸修饰 相似文献
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超氧化物歧化酶在L-半胱氨酸修饰金电极上电化学行为的现场拉曼光谱研究 总被引:1,自引:1,他引:0
在以电化学方法确认L半胱氨酸对铜锌超氧化物歧化酶(copper,zincsuperoxidedismutase,SOD)在金丝电极上的电子迁移过程起促进作用的基础上,本文论述了将拉曼光谱电化学方法应用于猪红细胞SOD在经L半胱氨酸修饰的金丝电极上的电化学行为的现场拉曼光谱研究。研究结果从分子水平上提供了有关L半胱氨酸修饰在金电极上的电化学过程中,以及SOD在L半胱氨酸修饰的金电极上发生电子迁移过程中,存在于SOD、L半胱氨酸与金电极之间的相互成键作用情况随电化学过程进行而发生变化的微观结构信息,并进行了必要的分析和探讨。 相似文献
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吸附在铂电极上茄尼醇分子的SERS研究 总被引:2,自引:1,他引:1
本文首次报道了茄尼醇分子的常规拉曼光谱 (RRS)及该分子在铂电极上的表面增强拉曼散射(SERS)谱 ,并对它的谱带进行了初步指认。从其常规拉曼光谱和SERS谱的对比和分析推断 ,茄尼醇分子是通过CC等键吸附在铂电极表面的。这种分子RRS和SERS谱的明显差异表明 ,该分子与铂电极表面发生了强的相互作用。这种相互作用对吸附在铂电极上的茄尼醇分子结构发生了很大的扰动。 相似文献
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对苯醌电化学还原的原位傅里叶变换红外反射光谱的研究 总被引:1,自引:0,他引:1
沈培康 《光谱学与光谱分析》1988,(3)
利用傅里叶变换红外光谱法原位记录了对苯醌在Pt电极上还原产生的自由基阴离子的红外光谱,并对自由基阴离子的可能结构进行了初步讨论。这种技术被用于在电化学体系中获取反应中间物和电极表面吸附物的红外差示谱,是一种非常灵敏的光谱电化学技术。 相似文献
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SOD及其电子迁移促进剂L-半胱氨酸的Raman光谱 总被引:2,自引:0,他引:2
在以电化学方法证实了L-半胱氨酸对铜锌-超氧化物歧化酶在金丝电极上的电子传递过程起有效促进作用的基础上,应用共焦显微激光拉曼光谱测试技术对固体的L-半胱氨酸和铜锌-超氧化物歧化酶进行了测定和光谱分析,并对以电化学和浸渍两种不同方法修饰在金电极上的L-半胱氨酸,也作了相应的拉曼光谱测试研究。 相似文献
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现场时间分辨拉曼光谱研究硫氰离子与银电极的作用 总被引:1,自引:1,他引:0
采用以光学多道分析仪(OMA)作为信号检测器的拉曼谱仪,进行了不同支持电解质中SCN~-在银电极上电化学吸附的时间分辨拉曼光谱研究。结果表明,SCN~-强吸附于电极表面,C≡N伸缩振动的频率和强度与电极电位和支持电解质密切相关。另外,应用时间分辨拉曼光谱技术可获得更可靠的有关吸附过程的信息,这将有助于对电化学界面的进一步了解。 相似文献
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The surface enhanced Raman scattering (SERS) spectra of piperidine in silver colloid solution, on roughened silver electrode
and on roughened silver electrode modified with silver nanoparticles were studied, and the high-quality SERS spectra of piperidine
on roughened silver electrode modified with silver nanoparticles were obtained for the first time. Surface selection rules
derived from the EM enhancement model were employed to deduce piperidine orientations on the different surfaces. On the basis
of this, two models of piperidine adsorbed on the surface of the silver nanoparticles were built, and DFT-B3PW91/LanL2dz was
applied to calculate the Raman frequencies. It proves that, at higher potential values, the piperidine is perpendicularly
standing on the roughened silver electrode surface though its lone-electron pair, but in silver colloid solution and on the
silver nanoparticles modified silver electrode the piperidine molecular lies flat on the silver surface. In the meantime,
the potential dependent SERS of piperidine on the modified electrode were studied. 相似文献
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A.G. Malshukov 《Solid State Communications》1985,54(11):969-974
The dependence of the surface enchanced Raman scattering (SERS) intensity on the electrode potential is considered in terms of the nonresonant adiabatic charge-transfer mechanism. Surface electronic states of a substrate metal are proposed to be responsible for the observed potential dependence of the SERS signal. The contribution of surface states to the nonlinear metal polarizability was found from electroreflectance spectra of silver single-crystals. Good agreement between the measured and calculated potential behaviour of the SERS signal was found for pyridine absorbed on the silver electrode. 相似文献
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非水体系中哌啶在银电极表面的表面增强喇曼散射 总被引:1,自引:0,他引:1
本文测定了哌啶在甲醇溶液中吸附在银电极表面的表面增强喇曼散射(SERS)光谱,及其随电位的变化,同时还测定了电极经不同氧化-还原循环(ORC)预处理时的SERS谱,对所得结果进行了分析比较,并进一步研究了非水体系和水体系SERS谱之间的关系.实验结果表明:哌啶在甲醇体系中比在水体系中SERS谱的增强因子要小,并且它们的SERS谱线随电位的变化也有一定的差别. 相似文献
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分别在粗糙银电极和银纳米颗粒修饰银电极上得到了哌啶分子的表面增强拉曼(SERS)光谱。哌啶在银电极与银纳米颗粒修饰的银电极上的SERS谱有很大的区别,分析认为是由于哌啶在不同基底上的吸附方式不同所引起的,据此建立了哌啶吸附在银颗粒表面的两种模型,用DFT-B3PW91-lanl2dz方法计算了两种模型的拉曼频移,通过与实验结果比较说明了哌啶分子主要通过N原子的孤对电子竖直吸附在粗糙银电极表面,而在银纳米颗粒修饰的银电极上则以平行吸附方式为主。 相似文献
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N. D. Strekal’ I. G. Motevich J. W. Nowicky S. A. Maskevich 《Journal of Applied Spectroscopy》2007,74(1):31-37
We present the IR absorption and surface-enhanced Raman scattering (SERS) spectra of the isoquinoline alkaloid berberine adsorbed
on a silver hydrosol and on the surface of a silver electrode for different potentials. Based on quantum chemical calculations,
for the first time we have assigned the vibrations in the berberine molecule according to vibrational mode. The effect of
the potential of the silver electrode on the geometry of sorption of the molecule on the surface is considered, assuming a
short-range mechanism for enhancement of Raman scattering.
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Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 74, No. 1, pp. 31–36, January–February, 2007. 相似文献
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Shannon M. Mahurin Sumedh P. Surwade Marcos Crespo Sheng Dai 《Journal of Raman spectroscopy : JRS》2016,47(5):585-590
We report an in situ measurement of the interaction of an imidazolium‐based room temperature ionic liquid with both pure silver and a graphene‐over‐silver electrode under an applied electrochemical potential. At a negative applied potential, overall signal intensity increased indicating enhanced ionic liquid concentration at both silver and graphene electrodes. Vibrational modes associated with the imidazolium ring exhibited greater intensity enhancements and larger peak shifts compared with the anion indicating that the cation adsorbs with the ring and alkyl chain parallel to the electrode surface for both silver and graphene. In contrast to the silver, the surface enhanced Raman spectra of the ionic liquid near graphene showed shifts in the cation peaks even at no applied potential because of the strong π–π interaction between the ionic liquid and the graphene. Furthermore, the intensity of the graphene peak decreased in the presence of ionic liquid possibly due to the interaction between the ionic liquid and graphene. These results illustrate the effectiveness of surface‐enhanced Raman spectroscopy to investigate electrolyte interactions with graphene at the liquid/electrode interface. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献