I have found several spectra of the UVVis absorbance of silver nanoparticles in free solution (ie in a cuvette). Does anyone have any curves that might show the transmission or reflectance of light incident on a glass slide with a silver nanoparticle monolayer? We've done a simulation that seems to imply, depending on how the silver is affixed to the glass, that the plasmon resonance peak might actually be blue-shifted on the silver layer as opposed to in free solution. We're having a lot of trouble finding such measurements, either on slides or optical fibers with silver nanoparticle monolayers. Does anyone have any resources on this?
For comparison, here are sequences of curves showing the spectral reflectance off of a monolayer of GOLD nanoparticles on an optical fiber endface from:
Jeong eg. al http://www.ncbi.nlm.nih.gov/pubmed/23421143
Hi!
These might help you:
http://journals.aps.org/pra/pdf/10.1103/PhysRevA.48.R1749
http://journals.aps.org/prb/pdf/10.1103/PhysRevB.46.15421
http://www.opticsinfobase.org/oe/abstract.cfm?uri=oe-21-22-27344
http://www.degruyter.com/view/j/nanoph.2013.2.issue-2/nanoph-2012-0032/nanoph-2012-0032.xml
I think i also have seen some articles about coupling effects that can cause a blueshift in the spectra, but i could not find the references anymore. Sry.
Thanks! I wonder if this blue-shift could be a problem of interpretation, at least in part? I'll have to read up more. We've done some simulations on our optical fiber biosensor and confirmed some seemingly odd results. For example, the sensor response to glycerin has a response profile that peaks at around 480nm, while the gold nanoparticles on the sensor absorb mostly at 540nm. It turns out to be completely confirmed by simulation and is a biproduce of the state of the glycerine and glass substrate and their interaction with AuNPs. In any case, that's not to say this has anything to do about the silver blue shift....
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