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Pulsed axial epitaxy of colloidal quantum dots in nanowires enables facet-selective passivation

Author

Listed:
  • Yi Li

    (University of Science and Technology of China
    High Magnetic Field Laboratory, Chinese Academy of Sciences)

  • Tao-Tao Zhuang

    (University of Science and Technology of China
    University of Toronto, 35 St George Street, Toronto)

  • Fengjia Fan

    (University of Science and Technology of China
    University of Science and Technology of China)

  • Oleksandr Voznyy

    (University of Toronto, 35 St George Street, Toronto)

  • Mikhail Askerka

    (University of Toronto, 35 St George Street, Toronto)

  • Haiming Zhu

    (Zhejiang University, Hangzhou)

  • Liang Wu

    (University of Science and Technology of China)

  • Guo-Qiang Liu

    (University of Science and Technology of China)

  • Yun-Xiang Pan

    (Hefei University of Technology)

  • Edward H. Sargent

    (University of Toronto, 35 St George Street, Toronto)

  • Shu-Hong Yu

    (University of Science and Technology of China
    High Magnetic Field Laboratory, Chinese Academy of Sciences)

Abstract

Epitaxially stacking colloidal quantum dots in nanowires offers a route to selective passivation of defective facets while simultaneously enabling charge transfer to molecular adsorbates – features that must be combined to achieve high-efficiency photocatalysts. This requires dynamical switching of precursors to grow, alternatingly, the quantum dots and nanowires – something not readily implemented in conventional flask-based solution chemistry. Here we report pulsed axial epitaxy, a growth mode that enables the stacking of multiple CdS quantum dots in ZnS nanowires. The approach relies on the energy difference of incorporating these semiconductor atoms into the host catalyst, which determines the nucleation sequence at the catalyst-nanowire interface. This flexible synthetic strategy allows precise modulation of quantum dot size, number, spacing, and crystal phase. The facet-selective passivation of quantum dots in nanowires opens a pathway to photocatalyst engineering: we report photocatalysts that exhibit an order-of-magnitude higher photocatalytic hydrogen evolution rates than do plain CdS quantum dots.

Suggested Citation

  • Yi Li & Tao-Tao Zhuang & Fengjia Fan & Oleksandr Voznyy & Mikhail Askerka & Haiming Zhu & Liang Wu & Guo-Qiang Liu & Yun-Xiang Pan & Edward H. Sargent & Shu-Hong Yu, 2018. "Pulsed axial epitaxy of colloidal quantum dots in nanowires enables facet-selective passivation," Nature Communications, Nature, vol. 9(1), pages 1-8, December.
  • Handle: RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-018-07422-4
    DOI: 10.1038/s41467-018-07422-4
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    Cited by:

    1. Sijie Wan & Wang Wang & Bei Cheng & Guoqiang Luo & Qiang Shen & Jiaguo Yu & Jianjun Zhang & Shaowen Cao & Lianmeng Zhang, 2024. "A superlattice interface and S-scheme heterojunction for ultrafast charge separation and transfer in photocatalytic H2 evolution," Nature Communications, Nature, vol. 15(1), pages 1-14, December.
    2. Qing-Xia Chen & Yu-Yang Lu & Yang Yang & Li-Ge Chang & Yi Li & Yuan Yang & Zhen He & Jian-Wei Liu & Yong Ni & Shu-Hong Yu, 2024. "Stress-induced ordering evolution of 1D segmented heteronanostructures and their chemical post-transformations," Nature Communications, Nature, vol. 15(1), pages 1-12, December.

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