Water flattens graphene wrinkles: laser shock wrapping of graphene onto substrate-supported crystalline plasmonic nanoparticle arrays.
Water flattens graphene wrinkles: laser shock wrapping of graphene onto substrate-supported crystalline plasmonic nanoparticle arrays.
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DOI：
10.1039/c5nr04810a
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发表时间：
2015-12-21
期刊：
影响因子：
6.7
通讯作者：
Cheng GJ
中科院分区：
文献类型：
--
作者：
Hu Y;Lee S;Kumar P;Nian Q;Wang W;Irudayaraj J;Cheng GJ
在石墨烯-等离子体纳米天线混合纳米系统中，可以实现高迁移率材料的热电子注入，可用于光伏、等离子体波导和痕量水平的分子传感等前沿应用。然而，石墨烯在这些等离子体纳米结构上的起皱不稳定性会导致活性氧或硫物质扩散并与材料发生反应，降低电荷转移速率并阻塞强烈的热点。到目前为止，还没有研究出非原位石墨烯包裹技术来控制这些褶皱。在这里，我们提出了一种无缝集成的方法，利用水作为飞片传递激光冲击压力，将石墨烯包裹在等离子体纳米晶体上。该技术利用激光烧蚀石墨产生的冲击压力和石墨烯的不透水性，减小了石墨烯与覆盖衬底支持的等离子体纳米颗粒阵列之间的界面间隙。研究了化学合成的具有不同场约束能力的晶体金纳米球、纳米棒和双锥体的石墨烯包裹。实验和计算相结合的方法，包括SEM和AFM形态学研究，分子动力学模拟和拉曼光谱表征，证明了该技术的有效性。在所研究的杂化纳米体系中，石墨烯覆盖金双金字塔表现出最好的效果。我们已经证明了激光冲击制备的混合系统可以用于增强分子传感。该技术具有集成度高、化学/热稳定性好、瞬时、规模化和室温加工能力强等特点，可进一步扩展到其他二维材料与各种0-3D纳米材料的集成。
Hot electron injection into an exceptionally high mobility material can be realized in graphene-plasmonic nanoantenna hybrid nanosystems, which can be exploited for several front-edge applications including photovoltaics, plasmonic waveguiding and molecular sensing at trace level. Wrinkling instabilities of graphene on these plasmonic nanostructures, however, would cause reactive oxygen or sulfur species diffuse and react with the materials, decrease charge transfer rate and block intense hot-spots. No ex-situ graphene wrapping technique has been explored so far to control these wrinkles. Here, we present a method to generate seamless integration by using water as a flyer to transfer the laser shock pressure to wrap graphene onto plasmonic nanocrystals. This technique decrease the interfacial gap between graphene and the covered substrate-supported plasmonic nanoparticle arrays, by exploiting a shock pressure generated by laser ablation of graphite and water impermeability nature of graphene. Graphene wrapping of chemically synthesized crystalline gold nanospheres, nanorods and bipyramids with different field confinement capabilities are investigated. A combined experimental and computational method, including SEM and AFM morphological investigation, molecular dynamics simulation, and Raman spectroscopy characterization, is used to demonstrate the effectiveness of this technique. Graphene covered gold bipyramid exhibits the best result among the hybrid nanosystems studied. We have shown that the hybrid system fabricated by laser shock can be used for enhanced molecular sensing. The technique developed has the characteristics of tight integration, chemical/thermal stability, instantaneous, scale and room temperature processing capability, and can be further extended to integrate other 2D material with various 0-3D nanomaterials.
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影响因子：
10.8
作者：
Chen Y;Guo F;Jachak A;Kim SP;Datta D;Liu J;Kulaots I;Vaslet C;Jang HD;Huang J;Kane A;Shenoy VB;Hurt RH
通讯作者：
Hurt RH
影响因子：
3.7
作者：
Lee, Kyuwan;Irudayaraj, Joseph
通讯作者：
Irudayaraj, Joseph
影响因子：
6.7
作者：
Chien, Shih-Kai;Yang, Yue-Tzu;Chen, Cha'o-Kuang
通讯作者：
Chen, Cha'o-Kuang
影响因子：
56.9
作者：
Gao, Huang;Hu, Yaowu;Cheng, Gary J.
通讯作者：
Cheng, Gary J.
影响因子：
56.9
作者：
Klimov, Nikolai N.;Jung, Suyong;Stroscio, Joseph A.
通讯作者：
Stroscio, Joseph A.