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438 results on '"Zhang, Junqiu"'

8. Niobium doping induced mirror twin boundaries in MBE grown WSe2 monolayers

Author

Wang, Bo, Xia, Yipu, Zhang, Junqiu, Komsa, Hannu-Pekka, Xie, Maohai, Peng, Yong, and Jin, Chuanhong

Subjects
Condensed Matter - Materials Science
Abstract

Mirror twin boundary (MTB) brings unique 1D physics and properties into two-dimensional transition metal dichalcogenides (TMDCs), but they were rarely observed in non-Mo-based TMDCs. Herein, by post-growth Nb doping, high density 4|4E-W and 4|4P-Se MTBs were introduced into molecular beam epitaxy (MBE) grown WSe2 monolayers. Of them, 4|4E-W MTB with a novel structure was discovered experimentally for the first time, while 4|4P-Se MTBs present a random permutations of W and Nb, forming a 1D alloy system. Comparison between the doped and non-doped WSe2 confirmed that Nb dopants are essential for MTB formation. Furthermore, quantitative statistics reveal the areal density of MTBs is directly proportional to the concentration of Nb dopants. To unravel the injection pathway of Nb dopants, first-principles calculations about a set of formation energies for excess Nb atoms with different configurations were conducted, based on which a model explaining the origin of MTBs introduced by excess metal was built. We conclude that the formation of MTBs is mainly driven by the collective evolution of excess Nb atoms introduced into the lattice of host WSe2 crystal and subsequent displacement of metal atoms (W or Nb). This study provides a novel way to tailor the MTBs in 2D TMDC materials via proper metal doping and presents a new opportunities for exploring the intriguing properties., Comment: 15 pages, 13 figures

Published
2020
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13. Quantum Confined Tomonaga-Luttinger Liquid in MoSe2 Twin Domain Boundaries

Author

Xia, Yipu, Zhang, Junqiu, Jin, Yuanjun, Ho, Wingkin, Xu, Hu, and Xie, Maohai

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Materials Science
Abstract

There have been conflicting reports on the electronic properties of twin domain boundaries (DBs) in MoSe2 monolayer, including the quantum well states, charge density wave, and Tomonaga-Luttinger liquid (TLL). Here we employ low-temperature scanning tunneling spectroscopy to reveal both the quantum confinement effect and signatures of TLL in the one-dimensional DBs. The data do not support the CDW at temperatures down to ~5 K.

Published
2019

25. Additive Manufacturing Provides Infinite Possibilities for Self‐Sensing Technology.

Author

Chen, Daobing, Han, Zhiwu, Zhang, Junqiu, Xue, Longjian, and Liu, Sheng

Subjects
PRINTING equipment, THREE-dimensional printing, MEDICAL equipment, PROSTHETICS, 3-D printers, POSSIBILITY
Abstract

Integrating sensors and other functional parts in one device can enable a new generation of integrated intelligent devices that can perform self‐sensing and monitoring autonomously. Applications include buildings that detect and repair damage, robots that monitor conditions and perform real‐time correction and reconstruction, aircraft capable of real‐time perception of the internal and external environment, and medical devices and prosthetics with a realistic sense of touch. Although integrating sensors and other functional parts into self‐sensing intelligent devices has become increasingly common, additive manufacturing has only been marginally explored. This review focuses on additive manufacturing integrated design, printing equipment, and printable materials and stuctures. The importance of the material, structure, and function of integrated manufacturing are highlighted. The study summarizes current challenges to be addressed and provides suggestions for future development directions. [ABSTRACT FROM AUTHOR]

Published
2024
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35. Investigating Novel Therapeutic Approaches for Idiopathic Short Stature: Targeting siRNA and Growth Hormone Delivery to the Growth Plate Using Exosome Nanoparticles.

Author

Yuan, Jinghong, Wang, Yameng, Huang, Yanzhe, Li, Shengqin, Zhang, Xiaowen, Wu, Zhiwen, Zhao, Wenrui, Zhu, Junchao, Zhang, Junqiu, Huang, Guowen, Yu, Peng, Cheng, Xigao, Wang, Xinhui, Liu, Xijuan, and Jia, Jingyu

Subjects
SHORT stature, GROWTH plate, SOMATOTROPIN, GENE expression, LINCRNA, IDIOPATHIC diseases, SOMATOTROPIN receptors, NON-coding RNA
Abstract

Idiopathic short stature (ISS) is a common childhood condition with largely unknown underlying causes. Recent research highlights the role of circulating exosomes in the pathogenesis of various disorders, but their connection to ISS remains unexplored. In the experiments, human chondrocytes are cocultured with plasma exosomes from ISS patients, leading to impaired chondrocyte growth and bone formation. Elevated levels of a specific long non‐coding RNA (lncRNA), ISSRL, are identified as a distinguishing factor in ISS, boasting high specificity and sensitivity. Silencing ISSRL in ISS plasma exosomes reverses the inhibition of chondrocyte proliferation and bone formation. Conversely, overexpression of ISSRL in chondrocytes impedes their growth and bone formation, revealing its mechanism of action through the miR‐877‐3p/GZMB axis. Subsequently, exosomes (CT‐Exo‐siISSRL‐oeGH) with precise cartilage‐targeting abilities are engineered, loaded with customized siRNA for ISSRL and growth hormone. This innovative approach offers a therapeutic strategy to address ISS by rectifying abnormal non‐coding RNA expression in growth plate cartilage and delivering growth hormone with precision to promote bone growth. This research provides valuable insights into ISS diagnosis and treatment, highlighting the potential of engineered exosomes. [ABSTRACT FROM AUTHOR]

Published
2024
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