Non aggregated colloidal silver nanoparticles for surface enhanced resonance Raman spectroscopy
Non aggregated colloidal silver nanoparticles for surface enhanced resonance Raman spectroscopy
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DOI：
10.1039/c1an15250e
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发表时间：
2011-01-01
期刊：
影响因子：
4.2
通讯作者：
Cassidy, John F.
中科院分区：
文献类型：
--
作者：
Power, Aoife C.;Betts, Anthony J.;Cassidy, John F.
通过非均相成核制备了具有可调λ max的银纳米颗粒。合成过程快速、可重复性好，制备出稳定的PVA包覆纳米颗粒。以罗丹明6G、R6G、结晶紫CV和孔雀石绿MG为探针分子，考察了胶体在SERRS体系中的有效性。观察到一个明显的传感趋势，其中拉曼信号发射显著增强加入银纳米粒子。观察到信号强度的增加，直到达到最佳比例，随后随着纳米颗粒浓度的进一步增加，信号强度下降。感应趋势似乎取决于这些模型分子的结构，结构相似的化合物表现出类似的趋势。因此，CV和MG在银与分析物摩尔比为5.56:1时的最大增强，而R6G在银与分析物摩尔比为2.25:1时的最大增强。
Silver nanoparticles with a tuneable lambda max were produced as colloids by heterogeneous nucleation. The synthesis process is both fast and repeatable, producing stable PVA capped nanoparticles. The colloid's effectiveness in the SERRS system was investigated using Rhodamine 6G, R6G, Crystal Violet, CV, and Malachite Green, MG, as probe molecules. A clear sensing trend was observed, where the Raman signal emitted was significantly enhanced by the addition of silver nanoparticles. A build up of signal intensity is observed until an optimum ratio is achieved, followed by a decline in signal intensity as the concentration of nanoparticles is further increased. The sensing trend appeared to be dependant on the structure of these model molecules with similarly structured compounds exhibiting similar trends. Thus a maximum enhancement with the Ag: analyte molar ratio of similar to 5.56: 1, was seen for CV and MG whereas R6G had a maximum enhancement at the Ag: analyte molar ratio of similar to 2.25: 1.