I usually measure the extinction coefficient of nanoparticle suspensions but have no idea how to measure this when for a close-packed 2D array of nanoparticles on solid. It is known that SERS effect is higher when excitation laser is closely matched with collective plasmon of nanoparticle arrays. Can someone help me?
Thomas Mayerhöfer
Depends on the nature of the support and how dense the array is. If the transmission is zero, I would measure the (specular) reflectance R. The absorptance is then simply 1-R.
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Liliya Bazylyak
Dear Agaje Bedemo Beyene ,
I am sorry for "a little childish answer", but did You try to plate the glass by gold solution? Glass (or quartz) is transparent at SPR maximum of AuNPs wavelength.
With kind regards,
Liliya
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