本文關(guān)鍵詞：銀—碳納米復(fù)合材料的可控制備及其SERS效應(yīng)研究　出處：《南京理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 納米銀 水熱碳化 納米復(fù)合結(jié)構(gòu) 表面增強(qiáng)拉曼散射

【摘要】：本文以設(shè)計(jì)與制備穩(wěn)定、高效、便捷的表面增強(qiáng)拉曼散射(SERS)基底材料為目標(biāo),以生物質(zhì)為碳源和銀鹽為銀源,將水熱法制備碳材料和還原法制備銀納米顆粒結(jié)合起來(lái),以銀-碳復(fù)合材料的可控制備和SERS效應(yīng)探索為主要研究?jī)?nèi)容。先后做了以下幾個(gè)方面的工作:(1)生物質(zhì)碳源的篩選。本文首先通過(guò)生物質(zhì)水熱碳化法,采用葡萄糖、果糖、抗壞血酸、檸檬酸分別作為碳源制備微納結(jié)構(gòu)的純碳球。對(duì)比分析不同碳源對(duì)碳球的結(jié)構(gòu)、形貌以及產(chǎn)率的影響,篩選產(chǎn)碳速率易于控制且便于與銀納米顆粒復(fù)合的碳源。(2)Ag@CSs核殼式銀-碳納米復(fù)合材料制備和SERS效應(yīng)研究。將化學(xué)還原法和水熱碳化法相結(jié)合,以葡萄糖為碳源,硝酸銀為銀源,三辛胺為穩(wěn)定劑,可控制備了包裹著超薄水熱碳層的多面體銀納米顆粒。利用紅外(IR)、拉曼(Raman)、X-射線粉末衍射儀(XRD)、掃描電子顯微鏡(SEM)、透射電子顯微鏡(TEM)等測(cè)試設(shè)備對(duì)復(fù)合材料成分、結(jié)構(gòu)、形貌進(jìn)行表征,分析核殼式銀-碳納米復(fù)合結(jié)構(gòu)的成型機(jī)理。最后,將樣品自組裝在羥基活化過(guò)的硅基底上,以羅丹明6G和甲基紫(CV)為探針?lè)肿犹骄科銼ERS效應(yīng)的原因。(3)Ag/HCSs中空納米復(fù)合材料的制備及其SERS效應(yīng)研究。結(jié)合乳液模板法、化學(xué)還原法和水熱法可控制備了 Ag/HCSs中空納米復(fù)合微球,通過(guò)形貌和成分的表征測(cè)試,確定碳?xì)觾?nèi)包裹著大量的銀納米顆粒,殼層中嵌入著銀納米簇,殼層外吸附著Ag@CSs粒子。根據(jù)表征結(jié)果分析Ag/HCSs中空復(fù)合結(jié)構(gòu)形成的機(jī)理。最后經(jīng)SERS性能對(duì)比,證實(shí)該中空結(jié)構(gòu)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.
【學(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：O657.37;TB383.1

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