nanomaterials consisting of metal ions bridged by organic linkers. Among the growing array of MOF structures, Cu-BTC distinguishes itself as a sturdy framework, fabricated by means of Cu 2+ ions and 1,3,5-benzene tricarboxylate linkers. [5] Due to its high surface area, large pore volume, and excellent thermal stability [6] this copper-based MOF has been widely explored for a diverse range of applications. However, its hydrophilic nature renders it unstable in aqueous solutions, posing a major hurdle for many of these applications. [7] This instability arises from the MOFs tendency to adsorb water molecules, which replace the BTC linker molecules, causing destruction of the 3D porous structure. [8,9] In an effort to improve the stability of Cu-BTC in humid environments, prior studies have explored the introduction of hydrophobic groups such as acetonitrile, [10] isopropanol, [11] active carbon, [12] graphene, [9,13] graphene oxide, [14] and folic acid. [15] This work focuses on enhancing the stability of the Cu-BTC MOF structure through the self-assembly of copper phosphate (CP) nanoflowers (NFs) onto the MOF surface.NFs are spherical structures with multifaceted morphologies resembling flowers found in nature. [16,17] In contrast to