Ag nanowire/nanoparticle-decorated MoS2 monolayers for surface-enhanced Raman scattering applications
Ag nanowire/nanoparticle-decorated MoS2 monolayers for surface-enhanced Raman scattering applications
复制标题
DOI：
10.1007/s12274-017-1836-4
复制
发表时间：
2018-03
期刊：
影响因子：
9.9
通讯作者：
Juan Li;Weina Zhang;Hongxiang Lei;Baojun Li
中科院分区：
文献类型：
--
作者：
Juan Li;Weina Zhang;Hongxiang Lei;Baojun Li
发展具有优异表面增强拉曼散射(SERS)性能的定义良好的纳米结构是SERS在传感和分析中实际应用的关键和非常理想的目标。本文采用旋涂法制备了具有纳米银(NW)和纳米颗粒(NP)结构的MoS2单分子膜，制备了具有SERS活性的衬底。实验和理论结果都表明，在AgNW-AgNp-MoS2杂化结构中形成的“热点”处可以获得较强的罗丹明6G(R6G)分子的SERS信号，增强因子为106。结果表明，SERS增强与偏振密切相关。制备的SERS衬底还具有超灵敏的检测能力，检测下限为10-11M，以及可靠的重现性和良好的稳定性。
Developing well-defined nanostructures with superior surface-enhanced Raman scattering (SERS) performance is a critical and highly desirable goal for the practical applications of SERS in sensing and analysis. Here, a SERS-active substrate was fabricated by decorating a MoS2monolayer with Ag nanowire (NW) and nanoparticle (NP) structures, using a spin-coating method. Both experimental and theoretical results indicate that strong SERS signals of rhodamine 6G (R6G) molecules can be achieved at “hotspots” formed in the Ag NW-Ag NP-MoS2hybrid structure, with an enhancement factor of 106. The SERS enhancement is found to be strongly polarization dependent. The fabricated SERS substrate also exhibits ultrasensitive detection capabilities with a detection limit of 10–11M, as well as reliable reproducibility and good stability.