Surface-enhanced Raman scattering of silver-gold bimetallic nanostructures with hollow interiors

Yuling Wang, Hongjun Chen, Shaojun Dong*, Erkang Wang

*Corresponding author for this work

Research output: Contribution to journalArticle

52 Citations (Scopus)

Abstract

Surface-enhanced Raman scattering (SERS) activity of silver-gold bimetallic nanostructures (a mean diameter of ∼100nm) with hollow interiors was checked using p-aminothiophenol (p-ATP) as a probe molecule at both visible light (514.5 nm) and near-infrared (1064 nm) excitation. Evident Raman peaks of p-ATP were clearly observed, indicating the enhancement Raman scattering activity of the hollow nanostructure to p-ATP. The enhancement factors (EF) at the hollow nanostructures were obtained to be as large as (0.8±0.3) × 106 and (2.7±0.5) × 108 for 7a and 19b (b2) vibration mode, respectively, which was 30-40 times larger than that at silver nanoparticles with solid interiors at 514.5 nm excitation. EF values were also obtained at 1064 nm excitation for 7a and b 2-tyPe vibration mode, which were estimated to be as large as (1.0±0.3) × 106 and (0.9±0.2) × 10 7, respectively. The additional EF values by a factor of ∼10 for b2-type, band were assumed to be due to the chemical effect. Large electromagnetic EF values were presumed to derive from a strong localized plasmas electromagnetic field existed at the hollow nanostructures. SERS activity of hollow nanostructures with another size (a mean diameter of ∼80 nm) was also investigated and large EF for 7a and b2-type band are obtained to be (0.6±0.3) × 106 and (1.7±0.7) × 108, respectively, at 514.5 nm excitation and (0.2±0.1) × 106 and (0.6±0.2) × 10 7, respectively, at 1064 nm excitation. Although the optical properties of the hollow nanostructures have not yet been well studied, high SERS activities of the nanostructures with hollow interiors have been exhibited in our report.

Original languageEnglish
Article number044710
Pages (from-to)1-7
Number of pages7
JournalJournal of Chemical Physics
Volume125
Issue number4
DOIs
Publication statusPublished - 2006
Externally publishedYes

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