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Template Directed Synthesis of Plasmonic Gold Nanotubes with Tunable IR Absorbance
Published on: April 1, 2013
Composition-adjustable Ag-Au substitutional alloy microcages enabling tunable plasmon resonance for ultrasensitive
Xiaotian Wang1, Guanshui Ma1, Anran Li1
1School of Chemistry , Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology , Ministry of Education , Beijing Advanced Innovation Center for Biomedical Engineering , Beihang University , Beijing , P. R. China .
Abstract:
Engineering the surface plasmon resonance (SPR) properties is a critical issue for improving device performance in the fields of plasmonics, nanophotonics, optoelectronics, and electrochemistry. Here, we demonstrated a programmable manipulation of the surface plasmon resonance (SPR) effect using composition-adjustable Ag-Au substitutional alloy microcages (SAMCs) through a facile NaBH4-cooperative galvanic replacement reaction. The SPR frequency of the Ag-Au SAMCs can be continuously and exquisitely manipulated without resonance damping or broadening via accurate adjustment of the elemental composition distribution at the perfect homogeneity on the atomic-level. Significantly, both the tunable SPR frequency and excellent chemical stability synergistically endow the hollow Ag-Au SAMCs with excellent SERS sensitivity and reproducibility, which lays a foundation for the realization of trace detection of thiram at an ultralow concentration of 1 × 10-12 M. This strategy is a promising candidate for efficient promotion of the SERS activity for metal-based substrates.
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