银纳米环的气泡模板法制备及其等离子体共振吸收特性研究

发布时间：2018-06-10 04:23

本文选题：银 + 纳米环　；参考：《天津理工大学》2010年硕士论文

【摘要】： 近年来,环状纳米结构因具有独特的物理、化学性能以及在光、电、催化和存储等领域具有重要潜在应用价值而倍受人们的关注。环状纳米结构发展的关键在于其制备,但是目前的制备方法或者实验条件苛刻,或者操作复杂,或者需要昂贵的仪器。在本文的研究中,我们发展了一种低成本、操作简单的大面积制备银纳米环的方法。银纳米环的制备过程包括三步:首先配制AgNO_3/SiO_2复合溶胶;继而通过浸渍提拉法在硅片或玻璃衬底上形成复合薄膜;最后经热处理得到银纳米环。通过扫描电子显微镜(SEM)、原子力显微镜(AFM)和X射线衍射仪(XRD)对样品进行形貌观测和晶体结构表征。SEM和AFM结果显示,银纳米环外直径在200-600nm之间,环壁厚度在50-100nm之间。XRD结果表明,银纳米环为面心立方晶体结构。研究了溶胶比例、硝酸银浓度、pH值和热处理工艺等因素对银纳米环形成的影响,优化了实验参数。根据纳米气泡和液滴等中间产物的证据,提出了一种以气泡为模板制备银纳米环的生长机制。初步研究了银纳米环的等离子体共振吸收特性,紫外-可见吸收光谱显示银纳米环的等离子体共振吸收峰位于400nm波长附近,且吸收强度随纳米环密度的增大而增强。对共振吸收峰的进一步分析显示,银纳米环的等离子体共振吸收特性与球形金属纳米结构的光学模型计算结果相符。相关研究为银纳米环在表面等离子体传感器领域的应用提供理论与实验依据。
[Abstract]:In recent years, annular nanostructures have attracted much attention due to their unique physical and chemical properties and their potential applications in the fields of light, electricity, catalysis and storage. The key to the development of annular nanostructures lies in their preparation, but the current preparation methods are harsh, complex or expensive instruments. In this paper, we have developed a low-cost and simple method for preparing silver nanorings in large areas. The preparation process of silver nanorings consists of three steps: first, we prepare Agno _ 3 / Sio _ 2 composite sol; Then the composite thin films were formed on silicon or glass substrates by dipping Czochralski method, and finally silver nanospheres were obtained by heat treatment. Scanning electron microscopy (SEM), atomic force microscopy (AFM) and X-ray diffractometer (XRD) were used to observe the morphology and crystal structure of the samples. The results of SEM and AFM showed that the outer diameter of silver nanocycle was between 200-600nm and the thickness of ring wall was between 50-100nm. The silver nanocrystalline ring has a face-centered cubic crystal structure. The effects of sol ratio, pH value of silver nitrate concentration and heat treatment process on the formation of silver nanorods were studied, and the experimental parameters were optimized. Based on the evidence of intermediate products such as nano-bubbles and liquid droplets, a growth mechanism of silver nanospheres using bubbles as template was proposed. The plasmon resonance absorption characteristics of silver nanospheres were preliminarily studied. The UV-Vis absorption spectra show that the plasmon resonance absorption peak of silver nanospheres lies near the 400nm wavelength, and the absorption intensity increases with the increase of the ring density. Further analysis of the resonance absorption peak shows that the plasmon resonance absorption characteristics of silver nanospheres are in agreement with the optical model of spherical metal nanostructures. The related studies provide theoretical and experimental basis for the application of silver nanospheres in surface plasma sensors.
【学位授予单位】：天津理工大学
【学位级别】：硕士
【学位授予年份】：2010
【分类号】：TB383.1

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