College of Optical and Electronic Technology, China Jiliang University, 310018 Hangzhou, China.
College of Optical and Electronic Technology, China Jiliang University, 310018 Hangzhou, China.
Food Chem. 2017 Dec 15;237:974-980. doi: 10.1016/j.foodchem.2017.06.057. Epub 2017 Jun 9.
Flower-shaped silver nanoparticles have been successfully synthesized by a simple aqueous phase silver nitrate reduction by ascorbic acid in the presence of polyvinylpyrrolidone (PVP) surfactant. The nanoparticles diameters were adjusted from 450 to 1000nm with surface protrusions up to 10-25nm. The growth direction of silver nuclei is controlled by their degree of coating by PVP. The flower-shaped silver nanostructures obtained were used as stable Surface Enhanced Raman Scattering (SERS) substrates with high SERS activity for detecting Rhodamine 6G (R6G), at a concentration of only 10M, where the SERS signal is still clear. SERS spectra of the dye carmine was analysed and the characteristic bands were identified. An improved principle component analysis (PCA) was used for carmine detection, at concentrations down to 10M. The characteristic peaks of the carmine (1019, 1360, and 1573cm) remained at 10M. This indicated that the minimum detection limit of AgNP-based substrate for carmine is about 10M.
花状银纳米粒子已成功通过简单的水相硝酸银还原抗坏血酸在聚维酮（PVP）表面活性剂的存在下合成。纳米粒子的直径可从 450nm 调整到 1000nm，表面突起高达 10-25nm。银核的生长方向由其被 PVP 的包裹程度控制。所得的花状银纳米结构被用作稳定的表面增强拉曼散射（SERS）基底，具有高的 SERS 活性，可检测浓度仅为 10M 的 Rhodamine 6G（R6G），其中 SERS 信号仍然清晰。分析了染料胭脂红的 SERS 光谱，并鉴定了特征带。使用改进的主成分分析（PCA）可用于胭脂红检测，浓度低至 10M。胭脂红的特征峰（1019、1360 和 1573cm）在 10M 时仍然存在。这表明基于 AgNP 的基底对胭脂红的最低检测限约为 10M。
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