Volume 62, Issue 36 e202307102
Research Article

Type-II Red Phosphorus: Wavy Packing of Twisted Pentagonal Tubes

Jun-Yeong Yoon

Jun-Yeong Yoon

Department of Physics, Yonsei University, Seoul, 03722 Korea

Center for Nanomedicine, Institute for Basic Science (IBS), Seoul, 03722 Korea

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Yangjin Lee

Yangjin Lee

Department of Physics, Yonsei University, Seoul, 03722 Korea

Center for Nanomedicine, Institute for Basic Science (IBS), Seoul, 03722 Korea

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Dong-Gyu Kim

Dong-Gyu Kim

Department of Physics, Yonsei University, Seoul, 03722 Korea

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Dong Gun Oh

Dong Gun Oh

Department of Physics, Yonsei University, Seoul, 03722 Korea

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Jin Kyun Kim

Jin Kyun Kim

Department of Physics, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919 Korea

Present address: Division of Industrial Metrology, Korea Research Institute of Standards and Science, Daejeon, 34113 Korea

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Linshuo Guo

Linshuo Guo

School of Physical Science and Technology &, Shanghai Key Laboratory of High-resolution Electron Microscopy, ShanghaiTech University, Shanghai, 201210 China

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Jungcheol Kim

Jungcheol Kim

Department of Physics, Sogang University, Seoul, 04107 Korea

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Jeongheon Choe

Jeongheon Choe

Department of Physics, Yonsei University, Seoul, 03722 Korea

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Kihyun Lee

Kihyun Lee

Department of Physics, Yonsei University, Seoul, 03722 Korea

Center for Nanomedicine, Institute for Basic Science (IBS), Seoul, 03722 Korea

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Hyeonsik Cheong

Hyeonsik Cheong

Department of Physics, Sogang University, Seoul, 04107 Korea

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Chae Un Kim

Chae Un Kim

Department of Physics, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919 Korea

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Young Jai Choi

Young Jai Choi

Department of Physics, Yonsei University, Seoul, 03722 Korea

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Yanhang Ma

Corresponding Author

Yanhang Ma

School of Physical Science and Technology &, Shanghai Key Laboratory of High-resolution Electron Microscopy, ShanghaiTech University, Shanghai, 201210 China

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Kwanpyo Kim

Corresponding Author

Kwanpyo Kim

Department of Physics, Yonsei University, Seoul, 03722 Korea

Center for Nanomedicine, Institute for Basic Science (IBS), Seoul, 03722 Korea

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First published: 19 July 2023

Graphical Abstract

The crystal structure of type-II red phosphorus is investigated by various structural characterizations, including 3D electron diffraction, atomic-resolution STEM imaging, and powder X-ray diffraction. A triclinic unit cell with a large volume containing around 250 phosphorus atoms is identified via 3D electron diffraction. The twisted wavy tubular motif, a new variation of building blocks in phosphorus, is also revealed via STEM.

Abstract

Elemental phosphorus exhibits fascinating structural varieties and versatile properties. The unique nature of phosphorus bonds can lead to the formation of extremely complex structures, and detailed structural information on some phosphorus polymorphs is yet to be investigated. In this study, we investigated an unidentified crystalline phase of phosphorus, type-II red phosphorus (RP), by combining state-of-the-art structural characterization techniques. Electron diffraction tomography, atomic-resolution scanning transmission electron microscopy (STEM), powder X-ray diffraction, and Raman spectroscopy were concurrently used to elucidate the hidden structural motifs and their packing in type-II RP. Electron diffraction tomography, performed using individual crystalline nanowires, was used to identify a triclinic unit cell with volume of 5330 Å3, which is the largest unit cell for elemental phosphorus crystals up to now and contains approximately 250 phosphorus atoms. Atomic-resolution STEM imaging, which was performed along different crystal-zone axes, confirmed that the twisted wavy tubular motif is the basic building block of type-II RP. Our study discovered and presented a new variation of building blocks in phosphorus, and it provides insights to clarify the complexities observed in phosphorus as well as other relevant systems.

Conflict of interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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