relaxation, which can induce chemical changes in the adsorbed molecules. Various chemical reactions have been recently shown to be driven or enhanced, benefitting from the plasmon excitation, including N-N and C-C coupling reactions and reduction and desorption reactions. The reaction mechanism is often debated between the photothermal effect and the charge transfer from the plasmonic metal to the reactant adsorbates. Surface functionalization of metal particles with aryldiazonium has been also observed with the assistance of the plasmon excitation. This provides a stable organic layer with a range of functional groups as well as it enables the particles to be stably dispersed in different reaction media. One interesting case was reported by Nguyen Van Quynh and co-workers, where gold nanotriangles were grafted with an organic layer of diazonium salts induced by light irradiation. The work shows that the grafting can be only achieved by using a proper light excitation, i.e., in resonance with the LSPR. More importantly, the grafting process is believed to be driven by hot-electrons due to generation of very localized products (at the tips of the nanotriangles) as observed by scanning electron microscopy, that could be used to experimentally visualize the electromagnetic fields around the particles. However, the mechanism as well as the sequential steps of the assembly and coupling of the diazonium-based compounds into such organic layer remain unclear.