For photo-switching experiments, two separate reactions were conducted: firstly, photothermal activation using 520 nm light followed by irradiation with 660 nm light, and vice versa. In the former scenario, a Co-DHBDC assembly was formed, resembling a sheaf of wheat composed of individual MOF rods, as evidenced by SEM imaging (Fig. , and Supplementary Fig. ). Intriguingly, in the reverse reaction, no significant isolated rod-like structures were observed. Instead, the assembled Co-DHBDC structures now exhibited a well-packed mixed morphology of individual rod-like features of larger sizes (Fig. , and Supplementary Fig. ). This experiment corroborates that the photothermal activity of the MOF structures could be leveraged under specific conditions to control the morphological of the assembly (Supplementary Fig. ).