论文期刊

Au@AuAg yolk-shell triangular nanoplates with controlled interior gap for the improved surface-enhanced Raman scattering of rhodamine 6G




作者: Fan Zhang, Na Wu, Jian Zhu ⁎ , Jing Zhao, Guo-jun Weng, Jian-jun Li, Jun-wu Zhao
发表/完成日期: 2018-05-21
期刊名称: Sensors and Actuators B: Chemical
期卷: 271 (2018)
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论文简介
In this work, a combined seed mediated and galvanic replacement strategy has been proposed to design and
fabricate two unique nanostructures, including Au@AuAg yolk-shell nanostructures with tunable interior gap
and Au multi-spiky nanostructures with tunable spike length. The interior gap of the Au@AuAg yolk-shell na-
nostructures can be controlled by varying either the amount of AgNO 3 in the rst step or the amount of HAuCl4
in the second step. The SERS activity of Au@AuAg yolk-shell nanostructures was found to increase with increase
in the interior gap. Owing to the build-in electromagnetic hot spots induced by plasmonic coupling e ect of the ff
Au triangular nanoplate core and AuAg shell especially the intensive coupling between the three sharp tips of the
core and the concave of the inner wall of the shell, Au@AuAg yolk-shell nanostructures exhibit signi cantly fi
higher SERS enhancement compared to their original Au triangular nanoplates. The best enhancement has been
achieved when the interior gap of Au@AuAg yolk-shell nanostructures is 10 nm with the enhancement factor of
3.2 × 10 6 for rhodamine 6G, making them promising candidates for SERS-based detection.