EA6295 Nanomédicaments et Nanosondes, Université de Tours, Tours, France; Faculty Technology&Bionics, Rhein-Waal University of Applied Sciences, Kleve, Germany.
EA6295 Nanomédicaments et Nanosondes, Université de Tours, Tours, France.
Spectrochim Acta A Mol Biomol Spectrosc. 2020 Jan 15;225:117502. doi: 10.1016/j.saa.2019.117502. Epub 2019 Aug 31.
We describe a novel protocol for a one-step, seed-less, organic solvent- and surfactant-free synthesis of optically dense aqueous colloids of gold nanoflowers (AuNF), with tunable absorption wavelength between 620 and 800 nm. We demonstrate that simple variation of the ratio of two reagents allows the plasmonic band position to be tuned to any desired wavelength ± 5 nm, namely to those of the laser sources commonly used for SERS spectroscopy. The AuNF size distribution was sufficiently narrow, comparable to that known with seed-mediated synthesis. The AuNF have been validated as efficient aggregation-free substrates for surface-enhanced Raman scattering (SERS) spectroscopy using two common fluorescent dyes, Nile Blue and Crystal Violet, both thiol-free. Their fluorescence was quenched and SERS signal intensity was a linear function of the dye concentration, from nanomolar to micromolar range. Easy to prepare and to use, these AuNF appear as a particularly user-friendly and efficient way to obtain plasmonic substrates for SERS in the red and deep red spectral range.
我们描述了一种新的一步法、无种子、无有机溶剂和表面活性剂的方法，用于合成具有可调谐吸收波长在 620 至 800nm 之间的金纳米花（AuNF）的光学密集水胶体。我们证明，通过简单地改变两种试剂的比例，可以将等离子体带位置调谐到任何所需的波长±5nm，即调谐到用于 SERS 光谱学的常用激光源的波长。AuNF 的尺寸分布足够窄，与种子介导合成的尺寸分布相当。AuNF 已被验证为使用两种常见的无硫荧光染料，尼罗蓝和结晶紫，作为用于表面增强拉曼散射（SERS）光谱学的无聚集的有效基底。它们的荧光被猝灭，SERS 信号强度与染料浓度呈线性关系，从纳摩尔到微摩尔范围。易于制备和使用，这些 AuNF 似乎是在红色和深红色光谱范围内获得用于 SERS 的等离子体基底的一种特别用户友好且高效的方法。
