Gold Nanocages  (AuNCs) are made up with a ultra-thin and porous walls of Au or Au-based alloys. It is the class of hollow, porous gold nanoparticles ranging in the size from 10 to over 150 nm. Generally, AuNCs are created by reacting silver nanoparticles with chloroauric acid (HAuCl 4 ) in boiling water. When AuNCs are irradiated with light, it exhibit a high efficiency for light-to-heat conversion and a large absorption cross section, making them effective photothermal transducers. Tuned AuNCs significantly absorb visible and near-infrared regions to optimize their interaction with the light at different wavelengths. AuNCs exhibits better photo-stability compared to the conventional organic dyes. These perspectives are of AuNCs synthesis and their use in applications involving photothermal conversion. Figure 1. Structure of NanoRod, NanoShell, NanoCage and AuNCs.  Recently, Qiu et al ., have reviewed the synthetic methods of AuNCs and their photothermal ...