Surface roughness boosts the SERS performance of imprinted plasmonic architectures

Gerard Macias, María Alba, Lluís F. Marsal, Agustín Mihi

Research output: Contribution to journalArticleResearchpeer-review

28 Citations (Scopus)

Abstract

The large-area low-cost rough plasmonic crystal (r-PC) SERS substrates introduced herein outperform smooth counterparts and rough films both in the magnitude of the enhancement factor (EF) and in the number of vibrational peaks displayed in the Raman spectrum. In r-PCs, the photonic modes launched by the lattice excite more intense and abundant localized resonances in the sharp edges and gaps present in the rough metal surface. 2D r-PCs are fabricated by nanoimprinting a nanocrystalline titania paste followed by silver coating, resulting in a highly reproducible rough photonic architecture. The SERS performance of these architectures is tested via the detection of two molecules: benzenethiol and 4-mercaptopyridine. The resulting EF values exceed 107 in the case of benzenethiol and 1010 when 4-mercaptopyridine is used. The simple fabrication strategy and the high performance exhibited by these nanoimprinted substrates make rough plasmonic architectures one of the most promising candidates for inexpensive and efficient mass-produced SERS substrates.

Original languageEnglish
Pages (from-to)3970-3975
Number of pages6
JournalJournal of Materials Chemistry C
Volume4
Issue number18
DOIs
Publication statusPublished - 2016
Externally publishedYes

Cite this