One-Step Exfoliation Method for Plasmonic Activation of Large-Area 2D Crystals.
One-Step Exfoliation Method for Plasmonic Activation of Large-Area 2D Crystals.
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用于大面积二维晶体等离子体激活的一步剥离方法
DOI：
10.1002/advs.202204247
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发表时间：
2022-11
期刊：
影响因子：
15.1
通讯作者：
Huang, Yuan
中科院分区：
文献类型：
--
作者：
Fu, Qiang;Dai, Jia-Qi;Huang, Xin-Yu;Dai, Yun-Yun;Pan, Yu-Hao;Yang, Long-Long;Sun, Zhen-Yu;Miao, Tai-Min;Zhou, Meng-Fan;Zhao, Lin;Zhao, Wei-Jie;Han, Xu;Lu, Jun-Peng;Gao, Hong-Jun;Zhou, Xing-Jiang;Wang, Ye-Liang;Ni, Zhen-Hua;Ji, Wei;Huang, Yuan
关键词：
先进的剥离技术对于探索2D材料的内在性质和应用至关重要。虽然最近发现的Au增强剥离技术为制备大规模2D晶体提供了有效的策略，但金的高成本阻碍了该方法在工业应用中的广泛采用。此外，直接Au接触可以显著地淬灭2D半导体中的光致发光（PL）发射。因此，找到可以取代金的替代金属以实现2D材料的有效剥离至关重要。在这里，作者提出了一种一步Ag辅助方法，可以有效地剥离许多大面积2D单层，其中产率与Au增强剥离方法相当。与Au膜不同，在SiO2/Si衬底上制备的Ag膜表面粗糙度更高，这有利于在粗糙的Ag表面形成纳米结构而产生表面等离子体激元。更有趣的是，2D半导体晶体之间的强耦合（例如，MoS 2、MoSe 2）和Ag膜导致在其他机械剥离技术中未观察到的独特PL增强，这可以主要归因于由于表面等离子体激元（SPP）的扩展传播而增强的光-物质相互作用。这项工作提供了一种低成本和通用的银辅助剥离方法，同时提供了增强的SPP-物质相互作用。在这里，作者发现了一种通用的Ag辅助剥离方法，可用于直接将大规模2D晶体与等离子体纳米结构集成。混合结构中表面等离子体激元的长传播导致单层MoS 2和MoSe 2的光致发光显著增强。该技术可以直接制备和探索出射二维晶体的光学性质，这为制备大规模二维材料及其未来应用铺平了新的道路。
Advanced exfoliation techniques are crucial for exploring the intrinsic properties and applications of 2D materials. Though the recently discovered Au‐enhanced exfoliation technique provides an effective strategy for the preparation of large‐scale 2D crystals, the high cost of gold hinders this method from being widely adopted in industrial applications. In addition, direct Au contact could significantly quench photoluminescence (PL) emission in 2D semiconductors. It is therefore crucial to find alternative metals that can replace gold to achieve efficient exfoliation of 2D materials. Here, the authors present a one‐step Ag‐assisted method that can efficiently exfoliate many large‐area 2D monolayers, where the yield ratio is comparable to Au‐enhanced exfoliation method. Differing from Au film, however, the surface roughness of as‐prepared Ag films on SiO2/Si substrate is much higher, which facilitates the generation of surface plasmons resulting from the nanostructures formed on the rough Ag surface. More interestingly, the strong coupling between 2D semiconductor crystals (e.g., MoS2, MoSe2) and Ag film leads to a unique PL enhancement that has not been observed in other mechanical exfoliation techniques, which can be mainly attributed to enhanced light‐matter interaction as a result of extended propagation of surface plasmonic polariton (SPP). This work provides a lower‐cost and universal Ag‐assisted exfoliation method, while at the same time offering enhanced SPP‐matter interactions. Here, the authors discover a universal Ag‐assisted exfoliation method, which can be used to directly integrate large‐scale 2D crystals with plasmonic nanostructures. The long propagation of surface plasmonic polariton in the hybrid structures results in extraordinarily photoluminescence enhancement for monolayer MoS2 and MoSe2. This technique allows to direct preparation and exploration of optical properties of emergent 2D crystals, which paves a new way for preparing large‐scale 2D materials and their future applications.
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