The field-emission scanning electron microscopy graphs showed the formation of the hierarchal geodes of the nest-shaped carriers

The field-emission scanning electron microscopy graphs showed the formation of the hierarchal geodes of the nest-shaped carriers, which randomly distributed and combined as deep cave-like pockets (Figures 1A–1B). The 50–100 nm nanorods were orders of asymmetrical open-pore systems that connected the cage cavities across the entire geode-shelled nanorod structures. Figure 1 confirms the formation of cliff swallow nest with massive mouths, chaotically shaped window, multiple diffusion routes through open pores and caves with connected open macro-and micro-spaces over the entire surface, and well-dispersed nanorods. The scanning transmission electron microscopy images showed an obvious hallow interior structure and the development of uniformly microporous cages to confine the organic colorant aggregate (L1) (Figures 1C–1E). The poly-nodules of the organic–inorganic frameworks aggregated into spherical nanoparticles and were systematically stacked around the hollow spheres. The large hollow nest and ridge cavities decorated on the surfaces of the nanorods offered multiple diffusion microchannels for the encapsulation of organic colorant in the nanometer-sized spherical geodes, leading to fast and high loading and release of toxic CN? by the simple chemical procedure of the carrier.