Despite its chemical stability, Au can significantly augment the catalytic properties of heterogeneous photocatalysts owing to its excellent optical properties in the visible region and localized surface plasmon resonance at the nanometer scale. However, experimental demonstration and quantitation of Au-semiconductor electron/energy-transfer pathways remain challenging. Herein, we report an optical microscopy-based combinatorial synthesis and excitation strategy to study Au@Cu₂O plasmonic nanocatalysts under light irradiation at the single-particle level. Moreover, we studied the reaction kinetics of the hybridized catalyst, a property that is often difficult to investigate among the other parameters of molecular transport, and measured the individual contributions of the plasmon and excitation effects toward the intrinsic catalytic efficiency. Based on this, we propose an electron-transfer mechanism for Au-semiconductor nanoparticles. This simple and systematic strategy is a better alternative to the conventional electron microscopy technique and aids in investigating chemical reactions at the single-molecule and single-particle level.

尽管具有化学稳定性，但 Au 可以显着增强非均相光催化剂的催化性能，因为其在可见光区域具有优异的光学性能和纳米尺度的局部表面等离子体共振。然而，金半导体电子/能量转移途径的实验证明和定量仍然具有挑战性。在此，我们报告了一种基于光学显微镜的组合合成和激发策略来研究 Au@Cu ₂O 等离子体纳米催化剂在单粒子水平的光照射下。此外，我们研究了杂化催化剂的反应动力学，这是一种在分子传输的其他参数中通常难以研究的特性，并测量了等离子体和激发效应对固有催化效率的单独贡献。基于此，我们提出了一种金半导体纳米粒子的电子转移机制。这种简单而系统的策略是传统电子显微镜技术的更好替代方法，有助于研究单分子和单粒子水平的化学反应。