Shibuta Masahiro, Nakajima Atsushi
Department of Physics and Electronics, Graduate School of Engineering, Osaka Metropolitan University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan.
Department of Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan.
J Phys Chem Lett. 2023 Apr 6;14(13):3285-3295. doi: 10.1021/acs.jpclett.3c00043. Epub 2023 Mar 29.
Functional surfaces decorated with organic molecules and/or nanoclusters (NCs) composed of several tens of atoms are promising for use in future photoelectronic substrates, whose functionalities are governed by molecular local electronic/plasmonic excitations at the interfaces. Here, we combine two-photon photoemission spectroscopy (2P-PES) and microscopy (2P-PEEM) to investigate the local excited-state dynamics at organic surfaces functionalized with NCs. The 2P-PES and 2P-PEEM for organic fullerene (C) layers on graphite and Au substrates demonstrated photophysical characterization of electronic and plasmonic properties, including propagating surface plasmon polaritons (SPPs). The SPP propagation at the Au interface buried by overlayered C can be visualized by Ag NC deposition, which enhances plasmon-induced hot electrons, where the threshold number of Ag atoms ( ≥ 9) for the plasmonic response is revealed by the size dependence of 2P-PES for Ag NCs on C layers.
用有机分子和/或由几十原子组成的纳米团簇（NCs）修饰的功能表面有望用于未来的光电子基板，其功能由界面处的分子局部电子/等离子体激发决定。在此，我们结合双光子光发射光谱（2P-PES）和显微镜（2P-PEEM）来研究用NCs功能化的有机表面的局部激发态动力学。对石墨和金基板上的有机富勒烯（C）层进行的2P-PES和2P-PEEM展示了电子和等离子体性质的光物理特性，包括传播表面等离子体激元（SPPs）。通过银NC沉积可以可视化被覆盖的C掩埋的金界面处的SPP传播，这增强了等离子体诱导的热电子，其中通过C层上银NCs的2P-PES的尺寸依赖性揭示了等离子体响应的银原子阈值数量（≥9）。
