In this research, we synthesized from low dimensional to high dimensional C₄MIMBF₄ (1-butyl-3-methylimidazolium tetrafluoroborate)/Aluminum hydroxide composite. C₄MIMBF₄ acted as template for directing nanostructure as well as solvent for crystalline framework by promoting not only molecular organization on nanoscale but also supramolecular ordering and aggregation of building blocks to specific nanoshape on mesoscale. FT-IR and DSC shows that mutual coassembly between C₄MIMBF₄ and aluminum hydroxide was induced by hydrogen-co-p-p stacking mechanism, resulting in the transformation to nanocrystal and construction of nanostructure. Depending on water concentration during heat treatment, two kinds of single crystals were appeared as shown in Figure 1. In the case of non-humidifying condition, only RTILs assisted transformation of aluminum hydroxide into 1D rodlike nanocrystal by means of mutual interaction between RTILs and surface of superlattices. On the other hand, under humidifying condition, water influenced the process of shape formation, additionally demonstrating that hydrophilicity of C₄MIMBF₄ make it possible to interact with water and perturb hydrogen bonding between anion of C₄MIMBF₄ and aluminum hydroxide.

 Figure. 1. SEM images of C₄MIMBF₄ and aluminum hydroxide fabricated under non-humidifying condition (Left, 1mm bar) and TEM images of C₄MIMBF₄ and aluminum hydroxide fabricated under humidifying condition (Right, 50nm bar). Inset is SAED pattern.