Silver-copper alloy nanoparticles for metal enhanced luminescence

Chowdhury, Sanchari; Bhethanabotla, Venkat R.; Sen, Rajan
September 2009
Applied Physics Letters;9/28/2009, Vol. 95 Issue 13, p131115
Academic Journal
Large metal enhanced luminescence was realized at the vicinity of easily fabricated Ag–Cu alloy nanoparticles upon tuning of their surface plasmon resonance spectra by changing only one experimental variable—the annealing temperature, for maximum spectral overlap with the emission and excitation spectra of the luminophores. We observed strong emission enhancement of luminophores (141.48±19.20 times for Alexa Fluor 488 and 23.91±12.37 times for Alexa Fluor 594) at the vicinity of these Ag–Cu nanoparticles, which is significantly larger than for pure Ag nanoparticles. We present theoretical calculations to provide insights into these experimental findings.


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