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. 2023 Mar;19(12):e2206552.
doi: 10.1002/smll.202206552. Epub 2023 Jan 15.

Bandgap Tunable Oxynitride LaNb2 O7-x Nx Nanosheets

Chu-Wei Hsu  1 , Takuro Miyano  2 , Keisuke Awaya  1 , Masayuki Tsushida  2 , Kazuto Hatakeyama  1   2 , Michio Koinuma  1   2 , Shintaro Ida  1   2
Affiliations

Bandgap Tunable Oxynitride LaNb2 O7-x Nx Nanosheets

Chu-Wei Hsu et al. Small. 2023 Mar.

Abstract

Bandgap tunable lanthanum niobium oxynitride [LaNb2 O7-x Nx ](1+x)- nanosheet is prepared by the delamination of a Ruddlesden-Popper phase perovskite oxynitride via ion-exchange and two-step intercalation processes. The lanthanum niobium oxynitride nanosheets have a homogeneous thickness of 1.6 nm and exhibit a variety of chromatic colors depending on the nitridation temperature of the parent-layered oxynitride. The bandgap energy of the nanosheets is determined by ultraviolet photoemission spectroscopy, Mott-Schottky, and photoelectrochemical measurements and is found to be tunable in the range of 2.03-2.63 eV. Furthermore, the oxide/oxynitride superlattice structures are fabricated by face-to-face stacking of 2D crystals using oxynitride [LaNb2 O7-x Nx ](1+x)- and oxide [Ca2 Nb3 O10 ]- nanosheets as building blocks. Moreover, the superlattices-like restacked oxynitride/oxide nanosheets hybrid exhibits unique proton conductivity and dielectric properties strongly influenced by the oxynitride nanosheets and enhanced photocatalytic activity under visible light irradiation.

Keywords: 2D oxynitrides; bandgap; dielectric properties; photocatalytic properties; proton conductivity.

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