Highly sensitive, uniform, and reproducible surface-enhanced Raman spectroscopy from hollow Au-Ag alloy nanourchins.
A hierarchical nanoparticle strategy to simultaneously gain super Raman signal amplification, high uniformity, and reproducibility is presented. Using hollow Au-Ag alloy nanourchins, an ultrahigh sensitivity, e.g., down to 1 fM concentrations for DEHP molecule is obtained. A small standard deviation of <10% is achieved by simply dropping and evaporating sub-100 nm nanourchins onto a substrate.
State Key Laboratory for Mechanical Behavior of Materials, School of Science, Xi'an Jiaotong University, Shann Xi, 710049, P. R. China.
Zhen
Z
Liu
Zhongbo
Z
Yang
Bo
B
Peng
Cuong
C
Cao
Chao
C
Zhang
Hongjun
H
You
Qihua
Q
Xiong
Zhiyuan
Z
Li
Jixiang
J
Fang
D000497:Alloys / Q000737:chemistry*; D006046:Gold / Q000737:chemistry*; D007980:Levodopa / Q000737:chemistry; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D010084:Oxidation-Reduction; D010316:Particle Size; D012834:Silver / Q000737:chemistry*; D013059:Spectrum Analysis, Raman
D000497:Alloys; D012834:Silver; D007980:Levodopa; D006046:Gold
hollow Au-Ag alloy; nanourchins; reproducibility; sensitivity; surface-enhanced Raman spectroscopy