In situ monitoring of the shape distribution of metallic colloids from extinction spectroscopy measurements

In this Letter, we propose a new, to the best of our knowledge, approach to determine the shape distribution of gold (Au) nanorods from real-time extinction spectroscopy measurements. This method is based on the linearization of the shape distribution effective medium theory (SDEMT). The aspect ratio distribution ofAu colloids is obtained in a fewtens of ms without any a priori information on the distribution. Both bimodal and monomodal shape distributions of nanoparticles can be extracted by analyzing their extinction spectra. The proposed method is applied to monitor the change in the nanoparticle shape during their exposure to ns-laser pulses. (C) 2022 Optica Publishing Group

Automated summary

In this Letter, a new approach is proposed to determine the shape distribution of gold nanorods using real-time extinction spectroscopy measurements. The method allows for the extraction of aspect ratio distribution of Au colloids without prior information, and can be applied to monitor the change in nanoparticle shape during laser pulse exposure.