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Preparation of Silver Micro-nano Structures and Their Surface-enhanced Raman Scattering Properties

Author: ZhangBo
Tutor: ZhaoAiWu
School: University of Science and Technology of China
Course: Inorganic Chemistry
Keywords: Nanomaterials Chemical synthesis Surface -enhanced Raman scattering Silver
CLC: TB383.1
Type: Master's thesis
Year: 2010
Downloads: 340
Quote: 0
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Abstract


In recent decades, the silver nanoparticles due to its uniquely physical and chemical properties, and has become the object of many basic research and applied research concern. Generated due to the to do irregular movement in the external electromagnetic field under the action of a certain frequency of the free electrons of the silver internal surface plasmon resonance, such that the silver nanoparticles surrounding electromagnetic field is greatly enhanced. Based on this phenomenon, surface-enhanced Raman scattering (SERS) spectroscopy technology came into being, recent studies successfully SERS spectrum of technology applied to the detection of single molecules. And is closely related to the the silver nano material properties and shape of the material, size, structure and other factors. So, on to the silver nano-materials morphology controllable preparation is very important. In this thesis, the controllable preparation of of different morphologies silver nanomaterials and their SERS nature, research is divided into the following three parts: (1) an aqueous solution method is the most commonly used methods of inorganic chemical synthesis, by adding citric acid, sodium restore successfully prepared aqueous solution of silver nitrate silver micro-nano-materials with a flower-like structure with a weak reducing agent ascorbic acid. Through the study of the product morphology, structure, and morphology reflect intermediate, raised its growth mechanism. Sodium citrate play a role in the formation process of the flower-shaped silver and pH value of the product morphology. Product is deposited on a silicon wafer as SERS substrate capable of detecting 10-8 M rhodamine 6G (R6G) molecules, the enhancement factor of 4.1 × 107. (2) In order to simulate the conditions of mineral formation, the inventors of the hydrothermal method, on the basis of the hydrothermal method, the solvent was changed from water to organic solvent is a new chemical synthesis method: solvothermal. , Polyvinyl pyrrolidone (PVP) is a frequently used organic inorganic controlled synthesis. PVP experiment both play the role of stabilizing nanoparticles, and also plays the role of the capping reagent (capping agent). Discusses hydrochloric play an important role in the formation of the cube silver nanoparticles, when not add hydrochloric acid or sulfuric acid instead of hydrochloric acid, are not obtained cube silver nanoparticles. The R6G target molecule detection cubic silver nanoparticles as SERS substrate empowerment. (3) porous alumina film is good nanomaterials template, the optimized secondary anodized prepared on the basis of previous experience, porous alumina film with neat hexagonal structure. Porous alumina template the silver micro nanowire arrays prepared neatly alternating deposition method. Silver nanowire arrays as SERS substrate detection of the SERS performance mercaptopropionic acid (PMBA).

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