BIT Fusion Technology Center, Pusan National University, Busan 46241, Republic of Korea.
Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea.
Nano Lett. 2022 Jun 22;22(12):4702-4711. doi: 10.1021/acs.nanolett.2c00790. Epub 2022 May 27.
Plasmonic nanoparticle clusters promise to support unique engineered electromagnetic responses at optical frequencies, realizing a new concept of devices for nanophotonic applications. However, the technological challenges associated with the fabrication of three-dimensional nanoparticle clusters with programmed compositions remain unresolved. Here, we present a novel strategy for realizing heterogeneous structures that enable efficient near-field coupling between the plasmonic modes of gold nanoparticles and various other nanomaterials via a simple three-dimensional coassembly process. Quantum dots embedded in the plasmonic structures display ∼56 meV of a blue shift in the emission spectrum. The decay enhancement factor increases as the total contribution of radiative and nonradiative plasmonic modes increases. Furthermore, we demonstrate an ultracompact diagnostic platform to detect M13 viruses and their mutations from femtoliter volume, sub-100 pM analytes. This platform could pave the way toward an effective diagnosis of diverse pathogens, which is in high demand for handling pandemic situations.
等离子体纳米粒子簇有望在光学频率下支持独特的工程电磁场响应，实现了用于纳米光子学应用的新型器件概念。然而，与具有编程组成的三维纳米粒子簇的制造相关的技术挑战仍未得到解决。在这里，我们提出了一种新的策略，用于实现异质结构，通过简单的三维共组装过程实现金纳米粒子的等离子体模式与各种其他纳米材料之间的有效近场耦合。嵌入等离子体结构中的量子点在发射光谱中显示出约 56 meV 的蓝移。随着辐射和非辐射等离子体模式的总贡献增加，衰减增强因子增加。此外，我们展示了一种超紧凑的诊断平台，可从皮升体积、亚 100 pM 分析物中检测 M13 病毒及其突变。该平台可以为处理大流行情况的各种病原体的有效诊断铺平道路。
