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Title: Vertically aligned gold nanorod monolayer on arbitrary substrates : self-assembly and femtomolar detection of food contaminants
Authors: Peng, Bo
Li, Guangyuan
Li, Dehui
Dodson, Stephanie
Zhang, Qing
Zhang, Jun
Lee, Yih Hong
Demir, Hilmi Volkan
Ling, Xing Yi
Xiong, Qihua
Issue Date: 2013
Source: Peng, B., Li, G., Li, D., Dodson, S., Zhang, Q., Zhang, J., et al. (2013). Vertically Aligned Gold Nanorod Monolayer on Arbitrary Substrates: Self-Assembly and Femtomolar Detection of Food Contaminants. ACS Nano, 7(7), 5993-6000.
Series/Report no.: ACS nano
Abstract: 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.
DOI: 10.1021/nn401685p
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:SPMS Journal Articles

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