Investigating self assembly techniques to fabricate arrays of nanoparticle and nanowires and their applications in sensing and photonic devices

在这个方案中，我们的研究活动集中在以下两个项目上：a)纳米粒子阵列的制备和表面等离子体材料的研究。胶体晶体是显示电磁辐射在特定方向传播的带隙的最简单的光子晶体。多孔金属薄膜具有有趣的光学性质，在通信系统等许多行业中主要用作光子材料。在本项目中，还将研究各种量子点阵列构型的表面等离子激元理论。从这些基础研究的结果中获得的知识将被用于制造大型光子表面。B)基于纳米线阵列的场效应气体传感器。该气体传感器技术在提高国家安全、环境健康和安全方面发挥着重大作用。在这个方案中，我们介绍并制作了一种新型的小型化固态非化学气体传感器，它是围绕垂直排列的纳米线阵列构建的。与其他传感器相比，该结构旨在提供更高的选择性、灵敏度和响应速度。我们的设备通过对未知气体的电离特性进行指纹识别来工作。在这个方案中，我们研究了以下两个目标。I)介电纳米颗粒和金属纳米颗粒阵列构型相关基本问题的理论和实验研究。将研究的任务是：a)与自组装纳米颗粒的合成、材料、尺寸、形状及其均匀性有关的问题。B)纳米粒子阵列构型的线性度研究及其在制备光子晶体中的应用。2)基于纳米线的气体传感器的设计与制作研究。要研究的任务是：a)纳米线的制备技术，包括利用硅的各向异性刻蚀来制备这些结构的可能性，以及所制备的纳米线的表征。B)应用所获得的知识来制造最终的气体传感器装置、设计、建模和制造。

In this proposal we focus our research activities on the following two projects: a) Fabrication of arrays of nanoparticles and study of surface plasmon materials. The colloidal crystals are the simplest photonic crystals to show band-gaps for propagation of electromagnetic radiation in a particular direction. Porous metallic films have interesting optical properties and have applications principally as photonic materials in many industries like communication systems. In this project, the theory of surface plasmon for various quantum dots array configurations will be also studied. The acquired knowledge from the results of these fundamental studies will be used to fabricate large photonic surfaces. b) Field Effect Gas Sensor based on Nanowire Arrays.  Gas sensor technology plays a major role to improve security of the nation, the environmental health and safety. In this proposal we introduce and fabricate a novel miniaturized solid-state non-chemical gas sensor built around vertically aligned nanowire arrays. The structure is intended to offer enhanced selectivity, sensitivity and speed of response compared to others sensors. Our device, works by fingerprinting the ionization characteristic of the unknown gas.  In this proposal the following two objectives are investigated. I) Theoretical and experimental researches on fundamental issues related to array configuration of dielectric and metallic nanoparticles. The tasks to be studied are: a) Issues related to synthesis of self-assembled nanoparticles, materials, size, shape, and their uniformity. b) Investigation on linearity of array configuration of the nanoparticles and their application to fabricate photonic crystals. II) Investigation on design and fabrication of gas sensor based on nanowires. The tasks to be studied are: a) Techniques to fabrication of nanowires, including the possibilities of using anisotropic etching of silicon to fabricate these structures, and characterization of the fabricated nanowires. b) Applying acquired knowledge to fabricate the final gas sensor device, design, modeling, and fabrication.