Sunlight is the most abundant source of energy on earth, however, to use this energy, photons must be captured first. Noble metals with nanoscopic dimensions (nanostructures) strongly interact with and hence harvest the incident light, thanks to their surface plasmon properties. As a result, energetic charge carriers (hot electrons and holes), and a high local temperature are generated, offering new perspectives of light-driven chemistry, known as plasmonic chemistry. Plasmonic nanocatalysis was shown to initiate novel reaction pathways described either via the generation of hot charge carriers or by a thermally-induced mechanism. The dimerization of 4nitrothiophenol and 4-aminothiophenol have been considered as the first examples of plasmonic chemistry, followed by other reactions that are driven by plasmonic effects. Plasmonic nanostructures made from gold, silver and copper nanoparticles exhibit a strong absorption in the visible and near-infrared range of the solar spectrum, unlike the traditional semiconductors that catalyze chemical reactions only with the high energetic UV light. Importantly, the optical properties of the plasmonic nanoparticles are largely dependent on their shape and size, which can be effectively tuned to capture specific photon energies. However, light-harvesting by individual plasmonic particles is limited to a narrow spectral range that is in resonance with the plasmon frequency. In contrast, black gold superstructures made of assemblies of plasmonic nanoparticles exhibit a strong absorption over a broadband of the solar spectrum owing to their interparticle plasmonic coupling. The fabrication methods, however, require multiple assembly steps and/or high temperatures. In the past few years, several successful attempts for synthesis of black gold have been reported. For instance, plasmonic colloidosomes of black gold have been prepared by a nucleation-growth syntheticapproach. In this approach, small gold nanoparticles were deposited on dendritic fibrous nanosilica, while the interparticle distances have been controlled via a cycle-by-cycle growth approach of the gold particles. A direct one-step method at high temperature was developed to achieve colloidal black gold superstructures. This method is based on the assembly of in-situ formed nanoparticles owing to their solvophobic interaction with the solvent. Lately, an overcurrent electrodeposition method was also used to fabricate a fractal plasmonic black gold directly on a conductive surface. However, it remains a significant challenge to develop a simple one-step method for fabricating a colloidal plasmonic black gold nanostructure without the need for high temperatures or post-synthesis assembly steps.