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Plasmonic Properties and Size Programming: A Quantitative Study for Photosynthesized Gold Nanoparticles
Author(s) -
Ou ChunChang,
Yeh HuiWen,
Chang FangYi,
Yang ChungSung
Publication year - 2008
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.200800183
Subject(s) - chemistry , nanoparticle , nucleation , absorption (acoustics) , reagent , surface plasmon resonance , absorption spectroscopy , plasmon , particle size , plasmonic nanoparticles , blueshift , nanotechnology , colloidal gold , analytical chemistry (journal) , crystal (programming language) , optics , chromatography , optoelectronics , materials science , organic chemistry , photoluminescence , physics , computer science , programming language
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 NaAuCl 4 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 NaAuCl 4 plays a decisive factor to determine the (b/a) ratio, i.e. the growth progresses of Au nanoparticles. If the initial concentration of NaAuCl 4 is higher than 0.2 mM, two independent growth progresses of Au nanoparticles are observed, and a continuous λ max 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 NaAuCl 4 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.