Core size matters! High Raman enhancing core tunable Au/Ag bimetallic core-shell nanoparticles
Bimetallic core-shell nanostructures have been attracted tremendous attention due to their ability to form novel materials with unique chemical, optical, and physical properties. Here, we have studied the influence of core size of Au/Ag bimetallic core-shell nanostructures on the Raman enhancement efficiency with the Raman-active probe methylene blue. The surface-enhanced Raman scattering intensity is increased with increase in the core size of Au/Ag bimetallic core-shell nanoparticles. Interestingly, the enhancement factor is found to be 6.58 × 107 for the Au100/Ag core-shell nanoparticles and allows easy detection of analyte methylene blue. Thus, surface-enhanced Raman scattering properties of the metal nanoparticles are significantly enhanced due to the Au/Ag core-shell structures and the enhancement factor is dependent on the size of the core of the bimetallic nanoparticles.
KeywordsAu/Ag Bimetallic Core-shell Raman SERS Enhancement
This work is financially supported by Central University of Punjab, Bathinda, India by its research seeds grant.
- 2.Cozzoli PD, Fanizza E, Curri ML, Laub D, Agostiano A (2005) Low-dimensional chainlike assemblies of TiO2 nanorod-stabilized Au nanoparticles. Chem Commun:942–944Google Scholar
- 3.Cozzoli P D, Curri ML, Giannini C, Agostiano A (2006) Synthesis of TiO2–Au composites by titania-nanorod-assisted generation of gold nanoparticles at aqueous/nonpolar interfaces. Small 2:413–421Google Scholar
- 6.Haldar KK, Kundu S, Patra A (2014) Core-size-dependent catalytic properties of bimetallic Au/Ag core–shell nanoparticles. ACS Appl Mater Interfaces 6(21):946–21,953Google Scholar
- 12.Kreibig U, Vollmer M(1995) Optical properties of metal clusters, Springer Series in Materials Science. Springer-Verlag: New York 25.Google Scholar
- 15.Jiang R, Chen H, Shao L, Li Q, Wang J (2012) Unraveling the evolution and nature of the plasmons in (Au Core)-(Ag shell) nanorods. Adv Mater 24:200–207Google Scholar