Advanced Materials Engineering and Modelling Group, Wroclaw University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wroclaw, Poland.
Molecules. 2022 Jan 26;27(3):807. doi: 10.3390/molecules27030807.
Plasmonic-enhanced luminescence of single molecules enables imaging and detection of low quantities of fluorophores, down to individual molecules. In this work, we present two-photon excited luminescence of single gold nanoclusters, Au(SG), in close proximity to bare gold nanorods (AuNRs). We observed 25-times enhanced emission of gold nanoclusters (AuNCs) in near infrared region, which was mainly attributed to the resonant excitation of localized surface plasmon resonance (LSPR) of AuNRs and spectral overlap of LSPR band with photoluminescence of AuNCs. This work is an initial step in application of combined nanoparticles: gold nanorods and ultrasmall nanoclusters in a wide range of multiphoton imaging and biosensing applications.
单个分子的等离子体增强发光使人们能够对荧光团进行成像和检测，其最低检测量可低至单个分子。在这项工作中，我们展示了近场紧密排列的金纳米棒（AuNRs）上的单个金纳米团簇（Au(SG)）的双光子激发发光。我们观察到近红外区域金纳米团簇（AuNCs）的 25 倍增强发射，这主要归因于 AuNRs 的局域表面等离子体共振（LSPR）的共振激发和 AuNCs 的光致发光与 LSPR 带的光谱重叠。这项工作是将金纳米棒和超小纳米团簇应用于多光子成像和生物传感应用的初步尝试。
