Facile One-Pot Synthesis of Nanodot-Decorated Gold-Silver Alloy Nanoboxes for Single-Particle Surface-Enhanced Raman Scattering Activity

Li, J, Zhang, G, Wang, J, Maksymov, I, Greentree, A, Hu, J, Shen, A, Wang, Y and Trau, M 2018, 'Facile One-Pot Synthesis of Nanodot-Decorated Gold-Silver Alloy Nanoboxes for Single-Particle Surface-Enhanced Raman Scattering Activity', ACS Applied Materials and Interfaces, vol. 10, no. 38, pp. 32526-32535.


Document type: Journal Article
Collection: Journal Articles

Title Facile One-Pot Synthesis of Nanodot-Decorated Gold-Silver Alloy Nanoboxes for Single-Particle Surface-Enhanced Raman Scattering Activity
Author(s) Li, J
Zhang, G
Wang, J
Maksymov, I
Greentree, A
Hu, J
Shen, A
Wang, Y
Trau, M
Year 2018
Journal name ACS Applied Materials and Interfaces
Volume number 10
Issue number 38
Start page 32526
End page 32535
Total pages 10
Publisher American Chemical Society
Abstract Surface-enhanced Raman scattering (SERS) is an important, highly sensitive technique for chemical and biological analysis, which is critically dependent upon high-performance metallic substrates. Anisotropic gold (Au)-silver (Ag) alloy nanoboxes are attractive SERS substrates because of the greatly enhanced Raman signals from the strong electromagnetic fields on the sharp corners. Yet, the routine approach of Au-Ag alloy nanobox synthesis is still challenging because of the complicated procedures and use of biologically/environmentally unfriendly reagents. To facilitate the usage of Au-Ag alloy nanoboxes for broad SERS applications, we propose a facile green strategy to synthesize Au-Ag alloy nanoboxes with superior single-particle SERS sensitivity. Our novel straightforward strategy involves HAuCl4and AgNO3reduction by ascorbic acid, which is achieved in an aqueous one-pot reaction at ambient temperature. Significantly, the surfaces of the prepared Au-Ag alloy nanoboxes are judiciously designed to introduce nanodots, generating numerous "hot spots" for high Raman signal enhancement as indicated by rigorous numerical simulations. By combining scanning electron microscopy and Raman mapping images, we demonstrate the application of Au-Ag alloy nanoboxes for single-particle sensing SERS activity. The as-prepared Au-Ag alloy nanoboxes are expected to facilitate their further applications in quantitative and ultrasensitive SERS detection.
Subject Nonlinear Optics and Spectroscopy
Optical Properties of Materials
Keyword(s) aqueous phase synthesis
gold-silver alloy nanoboxes
nanodot
one-pot synthesis
single-particle
surface-enhanced Raman scattering (SERS)
DOI - identifier 10.1021/acsami.8b10112
Copyright notice © 2018 American Chemical Society
ISSN 1944-8244
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