Exploiting plasmonic effects of metal nanostructures on single graphene sheets for the study of chemical functionalization and sensing

利用单石墨烯片上金属纳米结构的等离子体效应来研究化学功能化和传感

• 批准号: 425219379
• 负责人: Professor Dr. Kannan Balasubramanian
• 金额: --
• 依托单位: Arbeitsgruppe Mikro- und Nanoanalytik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2019
• 资助国家: 德国
• 起止时间: 2018-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/425219379?language=en
• 关键词: Exploiting; plasmonic; effects; metal; nanostructures

Plasmonic effects in metal nanostructures show promise for chemical and biological sensing due to their high interfacial sensitivity to binding kinetics and growth phenomena. Suface plasmon resonances (SPR) at thin metal films efficiently transduce binding processes at surfaces into sensitive variations in the absorption characteristics. Local surface plasmons (LSPR) at metal nanoparticles provide a simple way to sense changes in dielectric constant of their local environment. The use of graphene in combination with such plasmonic structures extends the spectrum of possibilities in the context of sensing applications. This proposal aims to explore hybrids of graphene-metal nanostructures systematically with two specific goals in mind. First, the high interfacial sensitivity of SPR will be exploited to study the growth kinetics of functional layers on graphene in real time by electrochemical modification. In the same framework, the capability to modulate the interfacial sensitivity by an applied potential will be investigated. Secondly, the high photoresponsivity of graphene will be utilized in new architectures of graphene-metal-nanoparticle hybrids to evaluate their use as electrical detectors of LSPR of the nanoparticles in a fluidic environment. In all, the proposed activities will extend the capabilities of (L)SPR-based detection using graphene and open avenues for the design of routine chemical sensors and biosensors.

金属纳米结构中的等离子体效应对结合动力学和生长现象具有很高的界面敏感度，因此在化学和生物传感领域具有广阔的应用前景。金属薄膜的表面等离子体共振(SPR)有效地将表面的结合过程转化为吸收特性的敏感变化。金属纳米颗粒上的局部表面等离子体(LSPR)提供了一种简单的方法来检测其局部环境的介电常数的变化。石墨烯与这种等离子体结构的结合使用扩展了传感应用的可能性范围。这项提议旨在系统地探索石墨烯-金属纳米结构的杂化，并考虑到两个特定的目标。首先，利用固相共振膜的高界面敏感性，通过电化学修饰，实时研究石墨烯表面功能层的生长动力学。在相同的框架中，将研究通过施加电势来调节界面灵敏度的能力。其次，石墨烯的高光响应性将被用于石墨烯-金属-纳米颗粒杂化的新结构中，以评估它们在流体环境中作为纳米颗粒LSPR的电子探测器的用途。总而言之，拟议的活动将扩大(L)基于石墨烯的表面等离子体共振检测的能力，并为常规化学传感器和生物传感器的设计开辟道路。