Chemical stability and surface-enhanced Raman scattering property of platinum-modified silver nanorods

ABSTRACT

We succeeded in synthesizing Pt-modified Ag nanorods (Pt/AgNRs) by a galvanic free reaction. While by using a normal galvanic reaction, the Pt-doping process led to the morphological change of Ag nanorods, the galvanic free reaction using NaBH₄ provided Pt/AgNRs with the original rod-shape. In the chemical stability test using H₂O₂, we found that the stability was significantly improved by the modification of Pt. Furthermore, in the surface-enhanced Raman scattering activity test using 4-mercaptobenzoic acid as a probe molecule, the activity of the Pt/AgNRs was roughly equivalent to that of the AgNR.

KEYWORDS:

• Chemical stability
• galvanic free reaction
• galvanic reaction
• localized surface plasmon resonance
• Silver nanorod

Acknowledgement

This work was performed under the Cooperative Research Program of ‘Network Joint Research Center for Materials and Devices’.

Funding

This work was supported in part by the Grant-in-Aid for Young Scientists B (Grant No. 26810102) from JSPS KAKENHI, the Strategic Foundation at Private Universities, MEXT and Nihon University, and Nihon University College of Science and Technology Project for Research.