Vertically Aligned Gold Nanorod Monolayer on Arbitrary Substrates: Self-Assembly and Femtomolar Detection of Food Contaminants
Bo Peng
Guangyuan Li
Dehui Li
Stephanie Dodson
Qing Zhang
Jun Zhang
Yih Hong Lee
Hilmi Volkan Demir
Xing Yi Ling
Qihua Xiong
10.1021/nn401685p.s001
https://acs.figshare.com/articles/journal_contribution/Vertically_Aligned_Gold_Nanorod_Monolayer_on_Arbitrary_Substrates_Self_Assembly_and_Femtomolar_Detection_of_Food_Contaminants/2393929
Public attention to the food scandals raises an urgent need to develop effective and reliable methods to detect food contaminants. The current prevailing detections are primarily based upon liquid chromatography, mass spectroscopy, or colorimetric methods, which usually require sophisticated and time-consuming steps or sample preparation. Herein, we develop a facile strategy to assemble the vertically aligned monolayer of Au nanorods with a nominal 0.8 nm gap distance and demonstrate their applications in the rapid detection of plasticizers and melamine contamination at femtomolar level by surface-enhanced Raman scattering spectroscopy (SERS). The SERS signals of plasticizers are sensitive down to 0.9 fM concentrations in orange juices. It is the lowest detection limit reported to date, which is 7 orders of magnitude lower than the standard of United States (6 ppb). The highly organized vertical arrays generate the reproducible “SERS-active sites” and can be achieved on arbitrary substrates, ranging from silicon, gallium nitride, glass to flexible poly(ethylene naphthalate) substrates.
2013-07-23 00:00:00
mass spectroscopy
detection limit
7 orders
food contaminants
substrate
femtomolar level
sample preparation
colorimetric methods
Vertically Aligned Gold Nanorod Monolayer
0.8 nm gap distance
plasticizer
SERS signals
food scandals
Femtomolar Detection
melamine contamination
Food ContaminantsPublic attention
0.9 fM concentrations
Arbitrary Substrates
gallium nitride