热毛细效应诱导金属纳米颗粒定向团聚的机理研究

项目名称： 热毛细效应诱导金属纳米颗粒定向团聚的机理研究

项目编号： No.11204224

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 物理学I

项目作者： 郭东来

作者单位： 武汉理工大学

项目金额： 25万元

中文摘要： 在光场照射下，金属纳米颗粒阵列由于颗粒间的电磁耦合，其表面会形成强烈的等离子激元。这种奇特的相互作用使得金属纳米颗粒在生物/化学传感、光催化以及太阳能电池等领域具有广阔的应用潜力。这吸引人们开始关注金属微纳米结构阵列的制备方法。相对于基于微加工技术的光刻/电子束直写法而言，对金属薄膜退火是一种直接得到金属纳米颗粒阵列的有效手段，因此薄膜受热后的形貌变化、形成的液态纳米颗粒在衬底上运动的动力学更值得我们深入研究。本项目将采用激光加热的方式，使用两束相干的脉冲激光对衬底进行加热。相干光束在其表面形成周期分布的温度梯度场，使我们得以研究衬底表面的金属薄膜被熔解并形成颗粒后，液态的纳米颗粒在温度梯度驱动下的移动（热毛细效应），尝试建立模型解释温度梯度大小与金属颗粒尺寸、颗粒位移等参数之间的关联，希望能发明一种通过定向驱动纳米颗粒来制备有序金属纳米颗粒阵列的手段。

中文关键词： 金纳米颗粒；激光退火；有机物缓冲层；阳极氧化铝模板；微纳光纤

英文摘要： Noble metal nanoparticle (NP) assemblies are now frequently used in the applications of photonics，bio/chemical-sensing, energy harvesting with their functionalities to enhance, localize, or guide electronmagnetic radiation. Diameter and density are the defining parameters of noble NP assemlies and controlling them in a facile and reliable way is of pivotal significance for potential applications. Unfortunately, there are limited methods for producing and positioning NPs, and most of these methods have drawbacks, which severely stifles the advances of NP-based applications. For example, lithographic methods via the electron beam or nanosphere patterning are precise in positioning NPs, but they are in general not facile or scalable. As a non-lithographic approach, annealing Au thin films is widely used to generate NP arrays, but it doesn't provide a good control on positioning NPs yet. Thus, the knitics of metal film dewets at high temperature and formed liquid NPs migrate on the substrate are needed. Here, we are going to use two beam pulsed laser interference as the thermal source，form a periodic distribution of temperature pattern on the surface of substrates and find the quantitatively relationship between the magnitude of temperature gradient, the size of liquid NPs, and the displacement of NPs. We hope we ca

英文关键词： Au nanoparitcles；laser annealing；polymer buffer layer；anodic alumina template；micro&nano fiber