We present a generalized table of extinction coefficient data for silver nanoparticles from 8 to 100 nm. This
table allows for easy and quick estimation of the concentration and size of modified and mono-dispersed
silver nanoparticles from their optical spectra. We obtained data by determining the silver content of citratestabilised
silver nanoparticles using sodium cyanide to dissolve the nanoparticles, and measuring solution
conductivity with a pH meter and a cyanide-ion selective electrode. The quantification of the silver ion
concentration enabled the calculation of extinction coefficients. Experimentally calculated extinction
coefficients, in the current work, are in good agreement with collated literature values measured by
different authors with non-standardized methodology and each for a limited range of particle size. They
are also in good agreement with our theoretical calculations using Mie theory. Thus, we provide a highly
standardized and comprehensive tabulated reference data-set.
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Funding Info:
A*STAR, Singapore Grant 10/03/FG/06/04, and the North West Cancer Research Fund, UK.