Abstract
There are many organisms with hollow cavity structure in nature, such as vesicles, viruses, cells and so on. The hollow structures of these substances all present very unique properties, due to the combination with their own transmembrane proteins, sensitive pore channels and recognizable functions. By analogy to the field of material science, materials with appropriate hollow structure have broad application prospects in a series of areas, such as chemistry, physics, life science and material science, which has also attracted extensive attention of researchers. Hollow micro/nanostructure is a special kind of micro/nano materials, which is named according to its morphology, meaning "there is a hole or empty space inside". Hollow micro/nanostructures can be classified from different perspectives. For example, according to the different overall shape can be divided into hollow spheres, tubes, fibers, boxes and so on. Depending on the number of shells, they can be called single-shell, doubleshell and multi-shell