Abstract
Highly oriented layered double hydroxide (LDH) thin films are obtained from colloidal dispersion of exfoliated LDH nanosheets in formamide by vacuum filtration. Through filtration, positively charged LDH nanosheets are stacked in interlocking arrangements, which endow LDH thin films with excellent mechanical properties. Consequently, the fresh prepared LDH thin films are printed on different substrates, forming transparent, strong and flexible LDH layers. Utilizing coassembly of positively charged LDH nanosheets with polymeric anions, negatively charged LDH nanohybrids can be obtained. By adding various types of anions into a colloidal dispersion of LDHs and subsequent filtration, LDH thin films with tunable composition and nanostructure can be prepared easily. However, the addition of carbonate or small molecular anionic surfactants leads to aggregation of LDH nanosheets. This facile filtration method will facilitate the fabrication of functional LDH thin films.
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