Polyoxometalate-Based Vesicle and Its Honeycomb Architectures on Solid Surfaces

摘要

Polyoxometalates (POMs) are intriguing nanosized inorganic clusters due to their structural,chemical,and electronic versatility,and thus potential application as materials for catalysis,energy storage,biomedicine,and surface coatings.Combined with molecular membrane chemistry,the metal-oxide clusters can be manipulated efficiently through cooperative electrostatic interactions,forming multifunctional organic/inorganic materials.Cationic surfactants can replace the counterions of POMs and modify their surface chemistry properties,yielding surfactant-encapsulated clusters (SECs).2'3 Encapsulation by cationic surfactants not only increases solubility of POMs in organic media,thus facilitating mesoscopic supramolecular assembly of POMs,but also exerts a remarkable influence on POMs' electronic properties.Well-ordered thin films of SECs are readily prepared by Langmuir- Blodgett and solvent-casting methods.We wonder if we could generate technologically useful architectures on solid substrates based on these supramolecular soft materials through a stepwise self-assembled process,although a soft lithographic approach has been demonstrated for the fabrication of two-dimensional micro-sized patterns of SECs.