Alkyl-Nitrile Adlayers as Probes of Plasmonically Induced Electric Fields.
Alkyl-Nitrile Adlayers as Probes of Plasmonically Induced Electric Fields.
复制标题
烷基硝酸脂层作为血浆诱导的电场的探针。
DOI：
10.1039/c5sc01265a
复制
发表时间：
2015-08-01
期刊：
影响因子：
8.4
通讯作者：
Schultz ZD
中科院分区：
文献类型：
--
作者：
Kwasnieski DT;Wang H;Schultz ZD
吸附巯基烷基腈显示斯塔克位移等离子体表面上，提供了一个直接测量的诱导电场。报道了在表面增强拉曼（Sers）活性材料上观察到的巯基烷基单层的振动斯塔克位移，以提供对等离子体纳米结构周围局部电场的直接测量。吸附层的CN-，p-巯基苯甲腈，和n-巯基丁腈被吸附到异质纳米结构的银表面。观察到CN部分的频率以与Sers强度相关的方式移动。这些位移归因于光场整流产生的振动斯塔克位移，这引起表面上的DC电势。所有三种分子在等离子体表面上均显示CN斯塔克位移。观察到对巯基苯甲腈是一个表现良好的电场探针，提供了一个狭窄的光谱线，表明在表面上更均匀的取向。对巯基苯甲腈的效用被证明是通过成功地评估金纳米粒子之间的电场吸附到一个单层的腈在一个平坦的金表面。提出了一种模型，其中烷基腈探针的斯塔克位移可以与光场相关，提供了一个强度独立的测量局部电场环境。
Adsorbed mercaptoalkylnitriles show Stark shifts on plasmonic surfaces that provide a direct measurement of the induced electric field. Vibrational Stark shifts observed from mercaptoalkyl monolayers on surface enhanced Raman (SERS) active materials are reported to provide a direct measurement of the local electric field around plasmonic nanostructures. Adlayers of CN–, p-mercaptobenzonitrile, and n-mercaptobutylnitrile were adsorbed to a heterogeneous nanostructured Ag surface. The frequency of the CN moiety was observed to shift in a correlated fashion with the SERS intensity. These shifts are attributed to a vibrational Stark shift arising from rectification of the optical field, which gives rise to a DC potential on the surface. All three molecules showed CN Stark shifts on the plasmonic surfaces. p-Mercaptobenzonitrile is observed to be a well-behaved probe of the electric field, providing a narrow spectral line, suggesting a more uniform orientation on the surface. The utility of p-mercaptobenzonitrile was demonstrated by successfully assessing the electric field between gold nanoparticles adsorbed to a monolayer of the nitrile on a flat gold surface. A model is presented where the Stark shift of the alkyl-nitrile probe can be correlated to optical field, providing an intensity independent measurement of the local electric field environment.