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

Lulu Liu, Yuanhui Sun, Xiaoqiang Cui (), Kun Qi, Xin He, Qiaoliang Bao, Weiliang Ma, Jiong Lu, Hanyan Fang, Peng Zhang, Lirong Zheng, Liping Yu, David J. Singh, Qihua Xiong, Lijun Zhang () and Weitao Zheng ()
Additional contact information
Lulu Liu: Jilin University
Yuanhui Sun: Jilin University
Xiaoqiang Cui: Jilin University
Kun Qi: Jilin University
Xin He: Jilin University
Qiaoliang Bao: Monash University
Weiliang Ma: Monash University
Jiong Lu: National University of Singapore
Hanyan Fang: National University of Singapore
Peng Zhang: Dalhousie University
Lirong Zheng: Chinese Academy of Sciences
Liping Yu: University of Maine
David J. Singh: Jilin University
Qihua Xiong: Nanyang Technological University
Lijun Zhang: Jilin University
Weitao Zheng: Jilin University

Nature Communications, 2019, vol. 10, issue 1, 1-10

Abstract: 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.

Date: 2019
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DOI: 10.1038/s41467-019-12347-7

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