含纳米颗粒结构作为表面增强拉曼散射的基底

Nanoparticle-containing structures as a substrate for surface-enhanced Raman scattering.

作者信息

Addison Christopher J, Brolo Alexandre G

机构信息

Department of Chemistry, University of Victoria, P.O. Box 3065, Victoria, British Columbia V8W 3V6, Canada.

出版信息

Langmuir. 2006 Oct 10;22(21):8696-702. doi: 10.1021/la061598c.

DOI:10.1021/la061598c

PMID:17014107

Abstract

Metallic nanostructures were prepared through the alternate immersion of derivatized glass slides in solutions of gold nanoparticles (NPs) and a propanedithiol linker molecule. Nanostructures consisting of 1-17 depositions of gold NPs were synthesized, and these substrates were characterized using UV-vis spectroscopy and atomic force microscopy. Subsequently, the surface-enhanced Raman scattering (SERS) of oxazine 720 was obtained at two excitation wavelengths (632 and 785 nm) from all substrates. Maximum SERS enhancement was observed for 9 and 13 NP depositions for 632 and 785 nm excitations, respectively. The difference in the number of NP depositions required for maximum enhancement is attributed to different wavelengths which can excite distinct aggregate structures within the metallic substrate. Therefore, these NP-containing structures can be "tuned" to yield maximum SERS enhancement for the excitation source being used by varying the number of NP depositions.

摘要

通过将衍生化的载玻片交替浸入金纳米颗粒（NPs）溶液和1,3 - 丙二硫醇连接分子溶液中来制备金属纳米结构。合成了由1至17层金纳米颗粒沉积组成的纳米结构，并使用紫外 - 可见光谱和原子力显微镜对这些基底进行了表征。随后，在两个激发波长（632和785 nm）下从所有基底获得了恶嗪720的表面增强拉曼散射（SERS）。对于632 nm和785 nm激发，分别在9层和13层纳米颗粒沉积时观察到最大SERS增强。最大增强所需的纳米颗粒沉积层数的差异归因于不同波长，这些波长可以激发金属基底内不同的聚集体结构。因此，通过改变纳米颗粒沉积层数，可以“调整”这些含纳米颗粒的结构，以实现所用激发源的最大SERS增强。