银—碳纳米复合材料的可控制备及其SERS效应研究

发布时间：2018-01-12 08:22

本文关键词：银—碳纳米复合材料的可控制备及其SERS效应研究　出处：《南京理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：本文以设计与制备稳定、高效、便捷的表面增强拉曼散射(SERS)基底材料为目标,以生物质为碳源和银盐为银源,将水热法制备碳材料和还原法制备银纳米颗粒结合起来,以银-碳复合材料的可控制备和SERS效应探索为主要研究内容。先后做了以下几个方面的工作:(1)生物质碳源的筛选。本文首先通过生物质水热碳化法,采用葡萄糖、果糖、抗坏血酸、柠檬酸分别作为碳源制备微纳结构的纯碳球。对比分析不同碳源对碳球的结构、形貌以及产率的影响,筛选产碳速率易于控制且便于与银纳米颗粒复合的碳源。(2)Ag@CSs核壳式银-碳纳米复合材料制备和SERS效应研究。将化学还原法和水热碳化法相结合,以葡萄糖为碳源,硝酸银为银源,三辛胺为稳定剂,可控制备了包裹着超薄水热碳层的多面体银纳米颗粒。利用红外(IR)、拉曼(Raman)、X-射线粉末衍射仪(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)等测试设备对复合材料成分、结构、形貌进行表征,分析核壳式银-碳纳米复合结构的成型机理。最后,将样品自组装在羟基活化过的硅基底上,以罗丹明6G和甲基紫(CV)为探针分子探究其SERS效应的原因。(3)Ag/HCSs中空纳米复合材料的制备及其SERS效应研究。结合乳液模板法、化学还原法和水热法可控制备了 Ag/HCSs中空纳米复合微球,通过形貌和成分的表征测试,确定碳壳层内包裹着大量的银纳米颗粒,壳层中嵌入着银纳米簇,壳层外吸附着Ag@CSs粒子。根据表征结果分析Ag/HCSs中空复合结构形成的机理。最后经SERS性能对比,证实该中空结构的Ag/HCSs具有最好的SERS性能。
[Abstract]:The aim of this paper is to design and prepare a stable, efficient and convenient surface enhanced Raman scattering (SERS) substrate material, with biomass as carbon source and silver salt as silver source. Carbon materials were prepared by hydrothermal method and silver nanoparticles were prepared by reduction method. The controllable preparation of silver-carbon composites and the exploration of SERS effect are the main research contents. The following work has been done in the following aspects: 1). Screening of biomass carbon sources. Firstly, biomass hydrothermal carbonization method was adopted in this paper. Glucose, fructose, ascorbic acid and citric acid were used as carbon sources to prepare pure carbon spheres with micro and nano structure. The effects of different carbon sources on the structure, morphology and yield of carbon spheres were compared. Screening carbon sources that are easy to control and which are easy to compound with silver nanoparticles. Preparation and SERS effect of Ag@CSs core-shell silver-carbon nanocomposites. Chemical reduction method and hydrothermal carbonization method were combined. Using glucose as carbon source, silver nitrate as silver source and trioctylamine as stabilizer, polyhedron silver nanoparticles wrapped in ultrathin hydrothermal carbon layer can be controlled. The composition, structure and morphology of the composite were characterized by X-ray powder diffractometer, scanning electron microscope (SEM) and transmission electron microscope (TEM). The forming mechanism of core-shell silver-carbon nanocomposite structure was analyzed. Finally, the samples were self-assembled on hydroxyl activated silicon substrate. Using Rhodamine 6G and VC as probe molecules to explore the cause of SERS effect. Preparation and SERS effect of Ag/HCSs Hollow Nanocomposites. Ag/HCSs hollow composite microspheres can be controlled by chemical reduction and hydrothermal methods. By the characterization of morphology and composition, a large number of silver nanoparticles were found in the carbon shell layer. Silver nanoclusters were embedded in the shell and Ag@CSs particles were adsorbed outside the shell. The formation mechanism of Ag/HCSs hollow composite structure was analyzed according to the characterization results. Finally, the properties of SERS were compared. It is proved that the hollow Ag/HCSs has the best SERS performance.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O657.37;TB383.1

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