Ultrasensitive detection of surface‐enhanced Raman scattering (SERS) signals is in high demand in the fields of physical, chemical, biological medicine, and environmental monitoring. Plasmonic noble metal nanocrystals localize electromagnetic field on their surfaces, which can lead to a great increase of Raman intensity of the adsorbed molecules. Herein, self‐supporting Ag nanowire networks with abundance of multiscale gaps as well as with function of enriching analytes are proposed to be simply synthesized to act as an excellent substrate for surface‐enhanced Raman spectroscopy ultrasensitive detection. By effectively combining the hotspots effect of nanogaps and the enriching effect of gaps, the Raman signal is significantly enhanced by a factor of 6 × 10⁵ and the detection limit of Rhodamine 6G (R6G) can reach 1 × 10⁻⁷m. Moreover, The R6G molecules can be adsorbed to these “hot spots,” leading to greatly enhanced Raman signals. This study introduces an effective SERS substrate to achieve ultrasensitive Raman detection in the fields of physical, chemical, biological medicine, and environmental monitoring.

中文翻译：

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具有富集分析物功能的自支撑表面增强拉曼散射底物

在物理，化学，生物医学和环境监测领域，对表面增强拉曼散射（SERS）信号的超灵敏检测有很高的要求。等离子体贵金属纳米晶体将电磁场定位在其表面上，这可能导致吸附分子的拉曼强度大大提高。在此，建议简单地合成具有多个多尺度间隙以及具有富集分析物功能的自支撑银纳米线网络，以作为表面增强拉曼光谱超灵敏检测的优良底物。通过有效地结合纳米间隙的热点效应和间隙的富集效应，拉曼信号显着增强了6×10 ⁵倍罗丹明6G（R6G）的检出限可以达到1×10 ^-7 m。此外，R6G分子可以吸附到这些“热点”，从而大大增强了拉曼信号。这项研究介绍了一种有效的SERS底物，可在物理，化学，生物医学和环境监测领域实现超灵敏的拉曼检测。