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  • Title: A controlled and reproducible pathway to dye-tagged, encapsulated silver nanoparticles as substrates for SERS multiplexing.
    Author: Brown LO, Doorn SK.
    Journal: Langmuir; 2008 Mar 18; 24(6):2277-80. PubMed ID: 18278969.
    Abstract:
    Silver nanoparticles tagged with dyes and encapsulated within a silica layer, offer a convenient potential substrate for performing multiplexed surface-enhanced Raman scattering (SERS) analysis. In contrast to our earlier work with gold particles, aggregation of silver particles is found to be mostly independent of dye addition, allowing for a reproducible preparation in which aggregation is actively induced by the addition of NaCl. Separating the aggregation step eliminates competitive binding between the dyes and silica-coating reagents, enabling the efficient use of a wide variety of weakly binding dyes to conveniently generate robust, high-intensity SERS substrates at a variety of excitation frequencies.
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