Shaping and Shelling Pt and Pd Nanoparticles for Ultraviolet Laser Excited Surface-Enhanced Raman Scattering
Shaping and Shelling Pt and Pd Nanoparticles for Ultraviolet Laser Excited Surface-Enhanced Raman Scattering
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用于紫外激光激发表面增强拉曼散射的 Pt 和 Pd 纳米颗粒的成型和脱壳
DOI：
10.1021/jp804997y
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发表时间：
2008-11-13
影响因子：
3.7
通讯作者：
Tian, Zhong-Qun
中科院分区：
文献类型：
--
作者：
Cui, Li;Wang, An;Tian, Zhong-Qun
以腺嘌呤和SCN-为探针分子，在铂和钯表面获得了紫外光激发的表面增强拉曼散射(UV-SERS)。合成了不同的铂和钯纳米粒子，即铂纳米球、铂纳米立方体和具有不同壳层厚度的核铂或钯壳纳米粒子，并比较了它们的UV-SERS增强作用。研究了UV-SERS活性与晶体结构的关系。结果表明，高质量的晶体结构有利于更高的增强效果，而低质量的晶体结构(如混沌和疏松的颗粒)的纳米颗粒可能具有较差的SERS活性。还记录了核壳纳米粒子的UV-Vis吸收光谱，并认为紫外区的等离子体激元带随壳层厚度的变化解释了Au@Pd和Au@Pt纳米粒子的UV-SERS增强。对于Au@Pd纳米粒子体系，紫外光和可见光激发的增强效应与壳层厚度呈相反的依赖关系。An核在可见光区域起着重要的增强作用，而Pd壳层本身在紫外区产生了有效的增强作用。
Ultraviolet laser excited surface-enhanced Raman scattering (UV-SERS) was obtained on platinum and palladium surfaces using adenine and SCN- as the probe molecules. Diverse Pt and Pd nanoparticles, i.e., Pt nanospheres, Pt nanocubes, and An core Pt or Pd shell nanoparticles with different shell thicknesses, were synthesized, and their UV-SERS enhancements were compared. The dependence of the UV-SERS activity on the crystalline structure was investigated. The result indicates that a high-quality crystalline structure is favorable for a higher enhancement, while nanoparticles with a low-quality crystalline (e.g., chaotic and loose grain) structure could be poor SERS active. UV-vis absorption spectra of core-shell nanoparticles were also recorded, and the plasmon band in the UV region which shifts with the shell thickness is regarded to account for the UV-SERS enhancement of Au@Pd and Au@Pt nanoparticles. For the Au@Pd nanoparticle system, the enhancements excited with the UV and visible lasers show an opposite dependency on the shell thickness. The An core plays an important role in the enhancement in the visible region, while the Pd shell itself produces an effective enhancement in the UV region.