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16 results on '"Gao, Lin‐Feng"'

5. Defect Engineering of Ultrathin WO3 Nanosheets: Implications for Nonlinear Optoelectronic Devices.

Author

Zhai, Xin-Ping, Gao, Lin-Feng, Zhang, Hong, Peng, Yong, Zhang, Xiao-Dong, Wang, Qiang, and Zhang, Hao-Li

Abstract

Ultrathin two-dimensional (2D) metal oxides have recently emerged as members of the 2D family with broad use in the catalytic field and energy storage techniques. However, investigations on their optoelectronic properties, nonlinear optical properties in particular, remain largely elusive. Defect (site) engineering had been a powerful tool to tailor semiconductor band gaps for their catalytic use, while, herein, it was carried out to expand the third-order nonlinear response of ultrathin 2D transition-metal oxide WO3 to the infrared region. By engineering the oxygen vacancy, WO3 demonstrated an indirect band gap adjustable from 2.33 eV (WO3) to 1.54 eV (D-WO3) with enhanced nonlinear saturable absorption extending from the visible to the near-infrared range, which have promising use in mode-locking, laser beam shaping, and ultrafast photonics. Transient absorption techniques revealed rapid fs-to-ps carrier dynamics followed by slower exciton bleaching on the μs time scale for the oxygen vacancy-rich metal oxides upon photoexcitation, which accounted for the origin of their strong and broad nonlinear optical responses. The strategy provided not only insights into the underlying photophysics of the 2D metal oxides but also fresh ammunition to bring out their remaining potential into full play, such as the fabrication of optoelectronic devices for nonlinear optics. [ABSTRACT FROM AUTHOR]

Published
2022
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8. 2D bismuthene fabricated via acid-intercalated exfoliation showing strong nonlinear near-infrared responses for mode-locking lasers

Author

Yang, Qi-Qi, primary, Liu, Rui-Tong, additional, Huang, Chao, additional, Huang, Yi-Fan, additional, Gao, Lin-Feng, additional, Sun, Bing, additional, Huang, Zhi-Peng, additional, Zhang, Lei, additional, Hu, Chen-Xia, additional, Zhang, Ze-Qi, additional, Sun, Chun-Lin, additional, Wang, Qiang, additional, Tang, Yu-Long, additional, and Zhang, Hao-Li, additional

Published
2018
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16. Iron-Doped Carbon Nitride-Type Polymers as Homogeneous Organocatalysts for Visible Light-Driven Hydrogen Evolution

Author

Gao, Lin-Feng, Wen, Ting, Xu, Jing-Yin, Zhai, Xin-Ping, Zhao, Min, Hu, Guo-Wen, Chen, Peng, Wang, Qiang, and Zhang, Hao-Li

Abstract

Graphitic carbon nitrides have appeared as a new type of photocatalyst for water splitting, but their broader and more practical applications are oftentimes hindered by the insolubility or difficult dispersion of the material in solvents. We herein prepared novel two-dimensional (2D) carbon nitride-type polymers doped by iron under a mild one-pot method through preorganizing formamide and citric acid precursors into supramolecular structures, which eventually polycondensed into a homogeneous organocatalyst for highly efficient visible light-driven hydrogen evolution with a rate of ∼16.2 mmol g–1h–1and a quantum efficiency of 0.8%. Laser photolysis and electrochemical impedance spectroscopic measurements suggested that iron-doping enabled strong electron coupling between the metal and the carbon nitride and formed unique electronic structures favoring electron mobilization along the 2D nanomaterial plane, which might facilitate the electron transfer process in the photocatalytic system and lead to efficient H2evolution. In combination with electrochemical measurements, the electron transfer dynamics during water reduction were depicted, and the earth-abundant Fe-based catalyst may open a sustainable strategy for conversion of sunlight into hydrogen energy and cope with current challenging energy issues worldwide.

Published
2016
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