Protein-aided formation of triangular silver nanoprisms with enhanced SERS performance

Xi Geng, Weinan Leng, Nathan A. Carter, Peter J. Vikesland, Tijana Z. Grove

Research output: Contribution to journalArticlepeer-review

28 Scopus citations


In this work, we present a modified seed-mediated synthetic strategy for the growth of silver nanoprisms with low shape polydispersity, narrow size distribution and tailored plasmonic absorbance. During the seed nucleation step, consensus sequence tetratricopeptide repeat (CTPR) proteins are utilized as potent stabilizers to facilitate the formation of planar-twinned Ag seeds. Ag nanoprisms were produced in high yield in a growth solution containing ascorbic acid and CTPR-stabilized Ag seeds. From the time-course UV-Vis and transmission electron microscopy (TEM) studies, we postulate that the growth mechanism is the combination of facet selective lateral growth and thermodynamically driven Ostwald ripening. The resultant Ag nanotriangles (NTs) exhibit excellent surface enhanced Raman spectroscopy (SERS) performance. The enhancement factor (EF) measured for the 4-mercapto benzoic acid (4-MBA) reporter is estimated to be 3.37 × 105 in solution and 2.8 × 106 for the SERS substrate.

Original languageEnglish (US)
Pages (from-to)4182-4190
Number of pages9
JournalJournal of Materials Chemistry B
Issue number23
StatePublished - 2016

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Publisher Copyright:
© The Royal Society of Chemistry 2016.


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