等离子体子
材料科学
纳米技术
拉曼散射
等离子纳米粒子
拉曼光谱
纳米颗粒
胶体金
纳米
光电子学
光学
物理
复合材料
作者
Xianyou Wang,Yuquan Zhang,Jiahao Yu,Xi Xie,Ruping Deng,Changjun Min,Xiaocong Yuan
出处
期刊:ACS Nano
[American Chemical Society]
日期:2022-10-18
卷期号:16 (11): 18621-18629
被引量:14
标识
DOI:10.1021/acsnano.2c07103
摘要
Surface-enhanced Raman spectroscopy (SERS) technology usually uses metallic nanoparticles to enhance Raman scattering signals, thereby significantly adding to molecule-level recognition and detection. However, realization of nanometer-scaled SERS imaging in liquid environments is extremely difficult due to the requirements of both precise scanning of single metallic nanoparticle and high enhancement field and thus has never been achieved before. To overcome this obstacle, we demonstrate an immersive nanometer-scaled SERS mapping technology, based on dynamic scanning of a single metallic nanoparticle with a plasmonic-thermoelectric nanotweezers system. The technology offers greater stability in the plasmonic trapping of gold nanoparticles at relative low power, as well as generating higher electric fields in the gap region. Through its dynamics, two-dimensional nanometer-scaled SERS imaging is achieved successfully. In regard to in liquid environments, this technology provides a mapping method for label-free imaging of ultrathin materials, structures, and biological samples.
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