Tuning d-Orbital Electronic Structure via Au-Intercalated Two-Dimensional Fe 3 GeTe 2 to Increase Surface Plasmon Activity

作者：Junxiang Li, Qiqi Li, Haochuan Feng, Keke Jiao, Changjin Zhang, Shirui Weng, Liangbao Yang · 发表于：The Journal of Physical Chemistry Letters · 年份：2024 · DOI：10.1021/acs.jpclett.3c02742 · 被引用次数：1 · 研究领域：2D Materials and Applications、Quantum Dots Synthesis And Properties、Molecular Junctions and Nanostructures

While extensive research has been dedicated to plasmon tuning within non-noble metals, prior investigations primarily concentrated on markedly augmenting the inherently low concentration of free carriers in materials with minimal consideration given to the influence of electron orbitals on surface plasmons. Here, we achieve successful intercalation of Au atoms into the layered structure of Fe 3 GeTe 2 (FGT), thereby exerting control over the orbital electronic states or structure of FGT. This intervention not only amplifies the charge density and electron mobility but also mitigates the loss associated with interband transitions, resulting in increased two-dimensional FGT surface plasmon activity. As a consequence, Au-intercalated FGT detects crystal violet molecules as a surface-enhanced Raman scattering substrate, and the detection lines are 3 orders of magnitude higher than before Au intercalation. Our work provides insight for further studies on plasmon effects and the relation between surface plasmon resonance behavior and electronic structures.