小林亮*, 長田実,
Abstract
Inorganic nanosheets obtained by exfoliating layered ionic crystals have emerged as versatile platforms for electronics and energy conversion due to their diverse compositions and excellent physicochemical properties. In contrast to the extensive studies on single-anion nanosheets such as oxides, hydroxides, and chalcogenides, the synthesis and characterization of mixed-anion nanosheets remain challenging. In this report, we summarize our recent progress on mixed-anion nanosheets. First, the electronic structures of titanium oxide and nitrogen-doped titanium oxide nanosheets are described. To elucidate the effect of nitrogen incorporation, we developed a new synthetic route to produce nitrogen-doped titanium oxide nanosheets with a high nitrogen content. Next, two kinds of single-crystalline oxyfluoride nanosheets were synthesized by exfoliating layered bismuth oxyfluorides intercalated with nitrate ions. A second harmonic generation measurement revealed that one of the nanosheets possesses a noncentrosymmetric structure. These findings highlight the potential of mixed-anion nanosheets as a promising platform for future materials innovation.