Bimetallic nanopetals for thousand-fold fluorescence enhancements

Chi Cheng Fu, Giulia Ossato, Maureen Long, Michelle A. Digman, Ajay Gopinathan, Luke P. Lee, Enrico Gratton, Michelle Khine

Research output: Contribution to journalArticlepeer-review

49 Scopus citations


We present a simple, ultra-rapid and robust method to create sharp nanostructures-nanopetals-in a shape memory polymer substrate demonstrating unprecedented enhancements for surface enhanced sensing over large surface areas. These bimetallic nanostructures demonstrate extremely strong surface plasmon resonance effects due to the high density multifaceted petal structures that increase the probability of forming nanogaps. We demonstrate that our nanopetals exhibit extremely strong surface plasmons, confining the emission and enhancing the fluorescence intensity of the nearby high-quantum yield fluorescein by >4000×. The enhancements are confined to the extremely small volumes at the nanopetal borders. This enables us to achieve single molecule detection at relatively high and physiological concentrations.

Original languageEnglish
Article number203101
JournalApplied Physics Letters
Issue number20
StatePublished - 15 Nov 2010


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