Open AccessLaser-induced photochemical synthesis of branched Ag@Au bimetallic nanodendrites as a prominent substrate for surface-enhanced Raman scattering spectroscopy
Author(s) -
Linlin Xu,
Shuang Li,
Hua Zhang,
Dameng Wang,
Ming Chen
Publication year - 2017
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.25.007408
Subject(s) - bimetallic strip , materials science , raman scattering , raman spectroscopy , laser , nanostructure , surface enhanced raman spectroscopy , substrate (aquarium) , spectroscopy , nanocrystal , optics , scattering , photochemistry , metal , nanotechnology , optoelectronics , chemistry , oceanography , physics , quantum mechanics , geology , metallurgy
The project of wielding laser light as a versatile tool for sculpting branched Ag@Au bimetallic nanocrystals with mean size of ~50 nm has been developed in this work. The moderate overgrowth of Ag species with negligible damage effect on the branched Ag@Au nanostructures was achieved by laser-induced photo-oxidation. The final Ag@Au nanodendrites exhibit superior surface enhanced Raman scattering (SERS) activities with an enhancement factor up to ~10 11 and a detection limit as low as ~10 -14 M. The pronounced feature should be attributed to the noticeable small-sized branches (<10 nm) and unique pronounced inter-metallic synergies. Our results have a promising potential for developing SERS-based ultrasensitive probes in biomedical application.