| http://www.w3.org/ns/prov#value | - Such porous substrates may be uniformly impregnated with one or more metals, such as silver, using the methods disclosed herein.The SERS substrate surface can be modified in various ways to improve one or more type of interactions between the analyte molecules and the modified surface, as summarized below.Electrostatic interaction: Silver and gold nanoparticles prepared by reduction of the metal i
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