Silver nanoparticles(Ag NPs)have attracted enormous attention since they open up exciting applications in the fields of waveguides,chemical/biological sensors,molecular rulers and surface enhanced Raman scattering(SERS).All of these applications are based on localized surface plasmon resonance(LSPR).Previous extensive studies have shown that LSPR is highly sensitive to the nanoparticle composition,size,shape,and dielectric environment[1].Hence,the LSPR resonance wavelength is highly tunable over a wide range by changing only the size and shape of the nanoparticle.In another word,the surface plasmon spectroscopy of metal NPs can in turn examine the changes of its morphology.Here,we tuned the morphology of Ag NPs by oxygen plasma pretreatment of polymer substrates.Then the Ag NPs were prepared with physical sputtering deposition.In addition,we present a study to demonstrate that the oxidation of Ag NPs is monitored in real-time by using surface plasmon spectroscopy[2].
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