SILVER-ISLAND FILMS AS SUBSTRATES FOR ENHANCED RAMAN-SCATTERING - EFFECT OF DEPOSITION RATE ON INTENSITY
SILVER-ISLAND FILMS AS SUBSTRATES FOR ENHANCED RAMAN-SCATTERING - EFFECT OF DEPOSITION RATE ON INTENSITY
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DOI：
10.1021/ac00003a010
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发表时间：
1991-02-01
影响因子：
7.4
通讯作者：
COTTON, TM
中科院分区：
文献类型：
--
作者：
SCHLEGEL, VL;COTTON, TM
以四苯基卟啉锌（ZnTPP）为吸附质，研究了银岛薄膜制备过程中表面增强共振拉曼散射（SERRS）强度与沉积速率的关系。 还分析了沉积速率对薄膜在特定波长下的光学性质的影响。 数据表明，随着沉积速率的降低，膜消光（使用术语消光而不是吸收，因为光谱没有针对反射或散射损失进行校正）在514和458 nm处呈指数增加。 SERRS强度也在这两个激发波长处随着沉积速率的降低呈指数增加。 的光密度是线性相关的SERRS强度，并观察到最大的增强膜在这些激发波长的最大消光。 相比之下，在406 nm处的消光和由在该波长处的激发产生的SERRS散射强度都没有显著不同。 研究了4，4 '-联吡啶（BP）在银膜上的表面增强拉曼散射（Sers）强度和电子光谱随沉积速率的变化。 非共振增强BP的行为与共振增强ZnTPP样品的行为相当。 的表面形态的影响，确定从透射电子显微镜的薄膜在不同的沉积速率，相应的电子光谱和Sers/SERRS光谱。
The relationship between surface-enhanced resonance Raman scattering (SERRS) intensity and the rate of deposition during silver-island film preparation was examined, using zinc tetraphenylporphine (ZnTPP) as the adsorbate. The effect of the deposition rate on the optical properties of the films at specific wavelengths was also analyzed. The data show that the film extinction (the term extinction is used rather than absorption because the spectra have not been corrected for reflection or scattering losses) increases exponentially at 514 and 458 nm as the deposition rate is decreased. SERRS intensities also increase exponentially at these two excitation wavelengths with a decrease in the deposition rate. The optical density is linearly related to the SERRS intensity, and maximal enhancement is observed for films with the greatest extinction at these excitation wavelengths. In contrast, neither the extinction at 406 nm nor the SERRS scattering intensities resulting from excitation at this wavelength differ substantially. The surface-enhanced Raman scattering (SERS) intensity and the electronic spectra of 4,4'-bipyridine (BP) adsorbed onto silver films as a function deposition rate were also examined. The behavior of the nonresonantly enhanced BP is comparable to that of the resonantly enhanced ZnTPP samples. The effects of the surface morphology, as determined from transmission electron micrographs of the films at various deposition rates, on the corresponding electronic spectra and SERS/SERRS spectra are described.