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Colloidal microcapsules based on supramolecular architectures feature attractive properties and offer new opportunities in diverse areas such as delivery, sensing, and catalysis. Herein, we report a new strategy to fabricate the colloidal membrane and stimuli-responsive microcapsules by utilizing cucurbit[7]uril-mediated interfacial host-guest molecular recognition. In contrast to the traditionally used cross-linking approach, this method exploits the engineered interaction between a nanoparticle ligand and cucurbit[7]uril to tune the interfacial energy and stabilize the colloidal assembly at the interface. These capsules provide a versatile platform for simultaneous encapsulation of dual cargos. Additionally, the dynamic nature of the supramolecular interactions allows triggered release of the encapsulated cargos through the orthogonal presentation of a high affinity guest molecule.

The modified electronic properties at the heterojunctions of Au nanoparticle-decorated single-walled carbon nanotubes (SWNTs) have been utilized for photoinduced electron transfer by anchoring a photoactive molecule, namely ruthenium trisbipyridine (Ru(bpy)32+). A unidirectional electron flow was observed from the excited state of Ru(bpy)32+ to carbon nanotubes when the chromophores were linked through Au nanoparticles (SWNT−Au−Ru2+). In contrast, photoinduced electron transfer was not observed from the excited state of Ru(bpy)32+ neither to SWNT nor Au nanoparticles when these components were linked directly. The charge equilibration occurring at the SWNT−Au heterojunctions, due to the differences in electrochemical potentials, result in the formation of a localized depletion layer at the bundled carbon nanotube walls, which may act as acceptor sites of electrons from *Ru(bpy)32+. The charge separation in SWNT−Au−Ru2+ nanohybrids was sustained for several nanoseconds before undergoing recombination, maki...