Mansour Yehia, Battie Yann, En Naciri Aotmane, Chaoui Nouari
Université de Lorraine, LCP-A2MC, F-57000 Metz, France.
Nanomaterials (Basel). 2021 Oct 28;11(11):2872. doi: 10.3390/nano11112872.
In this paper, we explore the ability of extinction spectroscopy to characterize colloidal suspensions of gold nanoparticles (Au NPs). We demonstrate that the Au NPs' size distribution can be deduced by analyzing their extinction spectra using Mie theory. Our procedure, based on the non-negative least square algorithm, takes advantage of the high sensitivity of the plasmon band to the Au NP size. In addition, this procedure does not require any a priori information on the Au NP size distribution. The Au NPs' size distribution of monomodal or bimodal suspensions can be satisfactorily determined from their extinction spectra. Finally, we show that this characterization tool is compatible with in situ measurement and allows following the change in NPs' radii during laser exposure.
在本文中，我们探讨了消光光谱法表征金纳米颗粒（Au NPs）胶体悬浮液的能力。我们证明，通过使用米氏理论分析其消光光谱，可以推断出Au NPs的尺寸分布。我们基于非负最小二乘算法的程序利用了等离子体带对Au NP尺寸的高灵敏度。此外，该程序不需要任何关于Au NP尺寸分布的先验信息。单峰或双峰悬浮液的Au NPs尺寸分布可以从其消光光谱中得到令人满意的确定。最后，我们表明这种表征工具与原位测量兼容，并允许在激光照射期间跟踪NP半径的变化。
