A General Single-Source Route for the Preparation of Hollow Nanoporous Metal Oxide Structures

✍ Scribed by Lianzhou Wang; Fengqiu Tang; Kiyoshi Ozawa; Zhi-Gang Chen; Aniruddh Mukherj; Yingchun Zhu; Jin Zou; Hui-Ming Cheng; G. Q. (Max) Lu

• Book ID: 102725164
• Publisher: John Wiley and Sons
• Year: 2009
• Tongue: English
• Weight: 608 KB
• Volume: 121
• Category: Article
• ISSN: 0044-8249
• DOI: 10.1002/ange.200900539

✦ Synopsis

Inorganic micro-and nanosized hollow structures have attracted increasing attention in recent years because of their well-defined interior voids, low density, large surface area, stability, and surface permeability. Such materials have potential applications in a number of areas including efficient catalysts, optoelectronic sensors, drug-delivery carriers, photonic crystals, energy-storage devices, and chemical nanoreactors. [1][2][3][4][5] Currently, a common synthetic strategy for the fabrication of hollow structures is the utilization of various removable templates, including soft ones such as surfactants, emulsion droplets, micelles, vesicles, ionic solvents, and gas bubbles, and hard ones, such as polymers, silica, carbon, metal oxides, and metallic cores. [1][2][3][4][5][6][7] Recently, a few wet-chemistry template-free methods including mutual diffusion processes (known as the Kirkendall effect), galvanic replacement, and the intermediate-crystal method, have been developed by carefully tailoring the solution-based formation process of hollow microstructures. [8][9][10][11][12][13][14][15][16] Despite these successes, a general, economical, and scalable route to rationally fabricate hollow structures with designed internal voids, controllable shapes, and porous sizes is still a challenge and highly desirable.

Herein, we present a facile and general strategy to fabricate porous hollow microstructures by a solid-state-