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Bottom-up growth of homogeneous Moire superlattices in bismuth oxychloride spiral nanosheets.


ABSTRACT: Moiré superlattices (MSLs) are modulated structures produced from homogeneous or heterogeneous 2D layers stacked with a twist angle and/or lattice mismatch. Expanding the range of available materials, methods for fabricating MSL, and realization of unique emergent properties are key challenges. Here we report a facile bottom-up synthesis of homogeneous MSL based on a wide-gap 2D semiconductor, BiOCl, using a one-pot solvothermal approach with robust reproducibility. Unlike previous MSLs usually prepared by directly stacking two monolayers, our BiOCl MSLs are realized in a scalable, direct way through chemical growth of spiral-type nanosheets driven by screw-dislocations. We find emergent properties including large band gap reduction (?0.6?eV), two-fold increase in carrier lifetime, and strongly enhanced photocatalytic activity. First-principles calculations reveal that such unusual properties can be ascribed to the locally enhanced inter-layer coupling associated with the Moiré potential modulation. Our results demonstrate the promise of MSL materials for chemical and physical functions.

SUBMITTER: Liu L 

PROVIDER: S-EPMC6775108 | biostudies-literature | 2019 Oct

REPOSITORIES: biostudies-literature

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Bottom-up growth of homogeneous Moiré superlattices in bismuth oxychloride spiral nanosheets.

Liu Lulu L   Sun Yuanhui Y   Cui Xiaoqiang X   Qi Kun K   He Xin X   Bao Qiaoliang Q   Ma Weiliang W   Lu Jiong J   Fang Hanyan H   Zhang Peng P   Zheng Lirong L   Yu Liping L   Singh David J DJ   Xiong Qihua Q   Zhang Lijun L   Zheng Weitao W  

Nature communications 20191002 1


Moiré superlattices (MSLs) are modulated structures produced from homogeneous or heterogeneous 2D layers stacked with a twist angle and/or lattice mismatch. Expanding the range of available materials, methods for fabricating MSL, and realization of unique emergent properties are key challenges. Here we report a facile bottom-up synthesis of homogeneous MSL based on a wide-gap 2D semiconductor, BiOCl, using a one-pot solvothermal approach with robust reproducibility. Unlike previous MSLs usually  ...[more]

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