Self assembly of two dimensional colloidal alloys for metamaterials applications

用于超材料应用的二维胶体合金的自组装

• 批准号: EP/L025078/1
• 负责人: David Buzza
• 金额: $ 83.45万
• 依托单位: University of Hull
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2015
• 资助国家: 英国
• 起止时间: 2015 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FL025078%2F1
• 关键词: Self; assembly; two; dimensional; colloidal

The systematic design and construction of materials and devices based on structure at the nanometer scale is a key challenge for materials science research in the 21st century. In particular, a major challenge in this area is to engineer metal/dielectric composite structures on the nanometer scale (below the wavelength of light) as this leads to a new class of materials, collectively known as metamaterials, which exhibit unusual optical properties such as negative permeability and refractive index. These unique optical properties allow us to manipulate light to an unprecedented degree, opening new areas of research such as perfect lenses, nanophotonic devices, integrated optical circuits, high efficiency solar cells, bio-sensors etc. However a serious bottleneck in metamaterials research is that the metal/dielectric nanostructures used for metamaterials applications have traditionally been fabricated using 'top down' approaches such as electron-beam lithography or focused ion beam lithography which are expensive, slow and limited in terms of the smallest features that can be made. In recent years, self-assembly has emerged as an alternative 'bottom-up' method for making micro- and nano-structured materials which is versatile, fast and inexpensive. This approach becomes particularly powerful when the self-assembly involves two or more components with a variety of optical, electronic and magnetic properties. In a recent ground-breaking study, we showed that it is possible to obtain a rich variety of 2D binary crystal structures through the self-assembly of mixtures of hydrophobic and hydrophilic spherical silica particles at an oil/water interface. The aim of the project is to extend our self-assembly method by replacing the hydrophilic silica particles with metallic particles of different shapes (e.g., spherical and rod shaped) and sizes (micron to nanometer) in order to create dielectric/metal composite structures for metamaterials applications. In order to achieve this aim, we use a multi-disciplinary approach that integrates both theory and experiment to study the self-assembly and optical properties of mixed colloidal monolayers. Specifically we will first study the interactions between different types of colloids at a liquid interface in order to establish the relationship between particle properties (e.g., material, wettability, shape and size) and particle interactions. This will allow us to tune particle interactions by changing particle properties. Next, we will study how these interactions control the self assembly of mixed monolayers in order to obtain the design rules for obtaining specific composite structures. We will then analyse the optical response of such mixed monolayers in order to identify the most promising structures for metamaterials applications. Finally, having identified and created the desired micro and nano scale metamaterials, as a specific application, we will deposit active materials such as conjugated polymers or colloidal quantum dots on top of these metamaterials to investigate how the metamaterial modifies the emission intensity and directionality of the active material. This will allow us to create hybrid plasmonic structures that will form the building blocks for the next generation of nanophotonic devices.

基于纳米尺度结构的材料和器件的系统化设计和构建是21世纪材料科学研究的关键挑战。特别是，该领域的一个主要挑战是在纳米尺度上（低于光波长）设计金属/电介质复合结构，因为这导致了一类新的材料，统称为超材料，其表现出不寻常的光学特性，如负磁导率和折射率。这些独特的光学性质使我们能够以前所未有的程度操纵光，开辟了新的研究领域，如完美透镜，纳米光子器件，集成光学电路，高效太阳能电池，然而，超材料研究中的一个严重瓶颈是，用于超材料应用的金属/电介质纳米结构传统上是使用“自上而下”的方法制造的，例如电子-束光刻或聚焦离子束光刻，其昂贵、缓慢且在可制成的最小特征方面受到限制。近年来，自组装已经成为一种替代的“自下而上”的方法，用于制造微结构和纳米结构的材料，该方法具有通用性，快速性和廉价性。当自组装涉及两个或多个具有各种光学，电子和磁性的组件时，这种方法变得特别强大。在最近的一项突破性研究中，我们表明，通过疏水性和亲水性球形二氧化硅颗粒混合物在油/水界面的自组装，可以获得丰富多样的2D二元晶体结构。该项目的目的是通过用不同形状的金属颗粒（例如，球形和棒状）和尺寸（微米到纳米），以便产生用于超材料应用的电介质/金属复合结构。为了实现这一目标，我们采用理论与实验相结合的多学科方法，对混合胶体单分子膜的自组装和光学性质进行了研究。具体来说，我们将首先研究液体界面处不同类型的胶体之间的相互作用，以建立颗粒性质（例如，材料、润湿性、形状和尺寸）和颗粒相互作用。这将允许我们通过改变粒子属性来调整粒子相互作用。接下来，我们将研究这些相互作用如何控制混合单分子膜的自组装，以获得获得特定复合结构的设计规则。然后，我们将分析这种混合单层的光学响应，以确定最有前途的结构的超材料应用。最后，在确定并创建了所需的微米和纳米尺度的超材料之后，作为具体应用，我们将在这些超材料之上存款活性材料，例如共轭聚合物或胶体量子点，以研究超材料如何改变活性材料的发射强度和方向性。这将使我们能够创建混合等离子体结构，这些结构将形成下一代纳米光子设备的构建模块。

项目成果

Capillary Interaction and Self-Assembly of Tilted Magnetic Ellipsoidal Particles at Liquid Interfaces.

液体界面处倾斜磁性椭球粒子的毛细管相互作用和自组装。

• DOI: 10.1021/acsomega.8b01818
• 发表时间: 2018
• 期刊: ACS omega
• 影响因子: 4.1
• 作者: Newton BJ

Amphiphile-Induced Anisotropic Colloidal Self-Assembly.

两亲物诱导的各向异性胶体自组装。

• DOI: 10.1021/acs.langmuir.8b01382
• 发表时间: 2018
• 期刊: the ACS journal of surfaces and colloids
• 作者: Rey M

Long-Range and High-Efficiency Plasmon-Assisted Förster Resonance Energy Transfer.

• DOI: 10.1021/acs.jpcc.3c04281
• 发表时间: 2023-11-09
• 期刊: JOURNAL OF PHYSICAL CHEMISTRY C
• 影响因子: 3.7
• 作者: Hamza, Abdullah O.;Al-Dulaimi, Ali;Bouillard, Jean-Sebastien G.;Adawi, Ali M.
• 通讯作者: Adawi, Ali M.

Anisotropic Self-Assembly from Isotropic Colloidal Building Blocks

各向同性胶体砌块的各向异性自组装

• DOI: 10.1021/jacs.7b08503
• 发表时间: 2017
• 期刊: Journal of the American Chemical Society
• 影响因子: 15
• 作者: Rey M

Determining molecular orientation via single molecule SERS in a plasmonic nano-gap.

• DOI: 10.1039/c7nr05107g
• 发表时间: 2017-11
• 期刊: Nanoscale
• 影响因子: 6.7
• 作者: Addison R. L. Marshall;J. Stokes;F. N. Viscomi;J. Proctor;J. Gierschner;J. Bouillard;A. Adawi