Facile Monolayer Assembly of Fluorophore-Containing Zeolite Rods in Uniform Orientations for Anisotropic Photoluminescence

摘要

Microparticles, like atoms, small molecules, and nanoparticles, will someday be used routinely in chemistry and materials science as a class of building blocks. It is therefore necessary to start developing methods for organizing them into larger organized entities and to explore practical applications of the organized entities.[1]-[4] Thus, zeolite microcrystals have been organized in the form of monolayers on various substrates. For example, Mallouk and co-workers covalently assembled monolayers of zeolite Y mircrocrystals on the surface of SnO2-coated glass electrodes by using dimethoxysilyl groups as tethers.[5] Yan and Bein similarly assembled monolayers of zeolite A crystals on gold electrodes through trimethoxysilyl tethers.[6] Calzaferri and co-workers assembled monolayers of zeolite A microcrystals on glassy carbon electrodes by using polystyrene as the glue.[7] Tsapatsis and co-workers assembled monolayers of zeolite A crystals on Si substrates through ionic linkages between the substrates and zeolite microcrystals.[8] The research groups of Calzaferri,[9] Tsapatsis,[8] as well as Ban and Takahashi[10] also demonstrated the assembly of a monolayer of zeolite A microcrystals through physical adsorption of the zeolite crystals onto substrates through slow evaporation of droplets of aqueous solutions of zeolite microparticles placed on substrates or by dip-coating the substrates. Similarly, Bein and co-workers demonstrated the aligned growth of zincophosphate crystals on substrates.