【作者】 朱纪春；

【导师】 莫育俊；

【作者基本信息】 河南大学 ， 光学， 2005， 硕士

【摘要】 聚乙烯吡咯烷酮(PVP)是一种水溶性高分子化合物,可以与多种高分子物质互溶或复合,具有显著的结合能力。聚乙烯咔唑(PVK)作为电荷转移络合物在基础研究及光电子技术领域成为热点。大量研究表明表面增强拉曼散射(SERS)对于研究吸附在金属表面的分子结构及吸附分子与金属表面的相互作用是非常有力的工具。PVP/PVK 的拉曼模式随分子的电子结构变化很敏感,通过对其拉曼光谱的初步指认,可以得出它们在基底表面的吸附状态。由于与活性基底表面的强相互作用,导致了它们与基底之间产生电荷转移。 在 SERS 的研究中,基底的制备至关重要:机理的研究及应用都离不开具有高活性基底的制备。自 SERS 效应发现以来,人们一直对其活性基底进行探索。本论文中我们采用激光刻蚀法制备出了具有“化学纯净”的活性基底,并对他们的特性进行了初步探讨。 本论文共分四章,其主要内容概括为以下三部分: 第一部分,即论文的第一章:主要介绍了拉曼光谱和表面增强拉曼光谱的基本概念,它的发现、特点、增强机理和应用,以及拉曼光谱仪的基本知识。 第二部分,即论文的第二、三章:首先,我们以 632.8nm 为激发波长研究了PVP 分子吸附在银镜上的表面增强拉曼散射光谱,通过对 PVP 分子的 SERS 光谱和粉末的拉曼光谱的对比分析,得出了 PVP 分子在银表面上的吸附状态。然后,我们用同样的方法研究了 PVK 分子吸附在用电化学方法制备的铜基底上的 SERS光谱,通过对其拉曼光谱的初步指认,得出了 PVK 分子在铜表面上的吸附状态。 第三部分,即论文的第四章,我们利用激光刻蚀技术制备出具有“化学纯净”更多还原

【Abstract】 PVP is a kind of macromolecule compound which is water soluble under thecertain conditions. It can dissolve or reunite with various macromolecule materialswhich reveals that PVP has good combination. As an electric charge transfers, PVK hasattracted much attentions in foundation and photoelectric technique field. SurfaceEnhanced Raman Scattering (SERS) is a useful tool for the research of moleculestructure and the interaction between the molecule and the substrate. The Raman modeof PVP/PVK is very sensitive to the charge of the electronic structure for the molecule.The absorption state on the surface of the substrate can be obtained through the Ramanspectrum.The reason why the electronic charge transfers between the molecule and themetal is that a strong interaction exists. In the experiment of SERS, the prepration of the substrates is very important. Themechanism of research and the applications can not get away from an active substrate.Since the SERS effect was discovered, people has been proceeding the quest to anactive base in SERS. In this thesis, some active substrates, which are chemical pure, areprepared by laser ablation, and the characteristics of them are discussed. There are four chapters in this paper, which can be divided into three sections: The first part, namely the first chapter: the basic concept of Raman spectra andSurface Enhanced Raman Spectra, the discovery, characteristics,mechanism,applications and the basic knowledge of SERS are mainly introduced. The second part, namely the second and third chapter:firstly, under the excitationwavelength of 632.8nm, SERS of PVP adsorbed on the surface of Ag mirror is investi-gated. Through compariment of the SERS and the Raman spectrum of PVP, theadsorption state of PVP on the surface of Ag was inferred. Secondly, SERS of PVKmolecules adsorbed on copper substrate, which was prepared by electrochemicalmethod, was studied in the same way. The adsorption state of the PVK molecules on thesurface of copp copper is obtained. The third part, namely the fourth chapter: chemical pure Ag, Au, Cu colloids wereprepared by laser ablation, and the characteristics of them were primarily analyzed. Theexcitation light used in our study was Nd:YAG pulse laser. Compared with the colloidprepared by chemical method, this method has advantages, such as, any ion is notcontained besides the solvent and the metal nanoparticls in the solutions. In the colloidsmade by chmical method, SERS research is easily affected by impurity ions, and thelaser ablation colloids can overcome this shortcoming. The images of SEM and AFMreveal that colloid particls are uniform, and most of them are dispersivly spherical.更多还原