Shedding light on the extinction-enhancement duality in gold nanostar-enhanced Raman spectroscopy.

ABSTRACT: Surface-enhanced Raman spectroscopy (SERS) has evolved from an esoteric physical phenomenon to a robust and effective analytical method recently. The need of addressing both the field enhancement and the extinction of nanoparticle suspensions, however, has been underappreciated despite its substantive impact on the sensing performance. A systematic experimental investigation of SERS enhancement and attenuation is performed in suspensions of gold nanostars, which exhibit a markedly different behavior in relation to conventional nanoparticles. The relationship is elucidated between the SERS enhancement and the localized surface plasmon resonance band, and the effect of the concentration of the gold nanostars on the signal propagation is investigated. It is shown that an optimal concentration

SUBMITTER: Li M 

PROVIDER: S-EPMC4294795 | biostudies-literature | 2014 Dec

REPOSITORIES: biostudies-literature