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Three silver nanoparticles of different size characterized by the UV–vis absorbance spectra and TEM images were prepared by citrate reduction and laser ablation with excitation of 532 and 248nm. It is proved that all of them are effective SERS-active substrates, whereas, enhancement effect of silver colloids has not too much relation with the size and shape of the Ag nanoparticles. However, different...
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