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Plasmonic Properties and Size Programming: A Quantitative Study for Photosynthesized Gold Nanoparticles
Authors:Chun‐Chang Ou  Hui‐Wen Yeh  Fang‐Yi Chang  Chung‐Sung Yang
Affiliation:Department of Applied Chemistry, National Chiayi University, Chiayi 60004, Taiwan, R.O.C.
Abstract:A novel two‐component peak quantitative spectra deconvolution model is employed to elucidate the relationship between the plasmonic properties and the concentration‐dependent Au nanocrystals nucleation. The reactions with the initial concentration of starting reagent NaAuCl4 from 0.75 mM to 0.1 mM are monitored. The peak area variation between component peak (b), large size nanoparticles (d ≥ 8.1 nm), and component peak (a), small size nanoparticles (d ≤ 8.0 nm), demonstrates that the initial concentration of NaAuCl4 plays a decisive factor to determine the (b/a) ratio, i.e. the growth progresses of Au nanoparticles. If the initial concentration of NaAuCl4 is higher than 0.2 mM, two independent growth progresses of Au nanoparticles are observed, and a continuous λmax blue‐shift of surface plasmon absorption peak accompanied with the second growth progress is measured. On the other hand, in the reactions with the initial concentration of NaAuCl4 lower than 0.2 mM, only one crystal growth progress of Au nanoparticles is shown, and the blue‐shift phenomenon of absorption peak induced by the second crystal growth progress no longer exists.
Keywords:Photosynthesis  Plasmon spectra  Spectra deconvolution  Size programming
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