journal article·2020-08

Ultrafast Relaxation Dynamics and Nonlinear Response of Few‐Layer Niobium Carbide MXene

Lingfeng Gao, Hualong Chen, Feng Zhang, Shan Mei, Ye Zhang, Wenli Bao, Chunyang Ma, Peng Yin, Jia Guo, Xiantao Jiang, Shixiang Xu, Weichun Huang, Xiaobo Feng, Fuming Xu, Songrui Wei, Han Zhang

Small Methods· Volume 4· Issue 8
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Abstract

Abstract As one of the rising 2D materials, niobium‐carbide (Nb2C, well‐known as a member of MXene family) has attracted considerable attention owing to its unique physical and chemical properties. In this work, few‐layer Nb2C nanosheets (NSs) with large (≈255 nm) and small (≈48 nm) lateral dimensions are obtained via a combination of selective etching and liquid cascade centrifugation. Their relaxation time and photophysics process are systematically investigated by transient absorption spectroscopy, and the size effect is demonstrated by phonon‐bottleneck mechanism. Ultrafast fast relaxation time (37.43 fs) and slow relaxation time (0.5733 ps) are observed due to the symmetric structure and metallicity of Nb2C NSs. The nonlinear optical properties of Nb2C NSs are studied by Z‐scan technique, and both saturable absorption and reverse‐saturable absorption are observed. According to first principle calculations, these phenomena can be attributed to the special band structure of Nb2C near the Fermi level, where two‐photon absorption or multiphoton absorption may occur under the irradiation of long wavelength light. These intriguing results suggest that few‐layer Nb2C NSs can be used as building blocks for broadband ultrafast photonics and optoelectronic devices and also hold the potential for breakthrough developments in these fields.
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Research context

OpenAlex topics: MXene and MAX Phase Materials · 2D Materials and Applications · Boron and Carbon Nanomaterials Research

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Affiliations

Institute of Microscale Optoelectronics Collaborative Innovation Centre for Optoelectronic Science and Technology Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronic Engineering Shenzhen Key Laboratory of Micro‐Nano Photonic Information Technology Guangdong Laboratory of Artificial Intelligence and Digital Economy (SZ) Shenzhen University Shenzhen 518060 P. R. China

Department of Materials Science and Engineering Drexel University Philadelphia PA 19104 USA

College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen 518060 P. R. China

Nantong Key Lab of Intelligent and New Energy Materials College of Chemistry and Chemical Engineering Nantong University Nantong Jiangsu 226019 P. R. China

School of Physics and Electronic Information Yunnan Normal University Kunming Yunnan 650500 P. R. China

Funding

National Natural Science Foundation of China · Postdoctoral Research Foundation of China · Natural Science Foundation of Guangdong Province · Science and Technology Development Fund

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