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Sensors 2014, 14(7), 13273-13284; doi:10.3390/s140713273

The Optical Property of Core-Shell Nanosensors and Detection of Atrazine Based on Localized Surface Plasmon Resonance (LSPR) Sensing

1,*  and 3
1 State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, China 2 School of Mechanical Engineering, Tianjin University of Technology, Tianjin 300131, China 3 School of Mechanical Engineering, Tianjin University of Commerce, Tianjin 300134, China
* Author to whom correspondence should be addressed.
Received: 22 April 2014 / Revised: 17 June 2014 / Accepted: 17 July 2014 / Published: 23 July 2014
(This article belongs to the Special Issue Nanoparticle-Based Biosensors)
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Three different nanosensors with core-shell structures were fabricated by molecular self-assembly and evaporation techniques. Such closely packed nanoparticles exhibit fine optical properties which are useful for biochemical sensing. The refractive index sensitivity (RIS) of nanosensors was detected by varying the refractive index of the surrounding medium and the decay length of nanosensors was investigated using a layer-by-layer polyelectrolyte multilayer assembly. The results showed that the thickness of the Au shell plays an important role in determining the RIS and the decay length. A system based on localized surface plasmon resonances (LSPR) sensing was constructed in our study. The core-shell nanosensors can detect 10 ng/mL atrazine solutions and are suitable for pesticide residue detection.
Keywords: core-shell; nanosensors; atrazine; LSPR core-shell; nanosensors; atrazine; LSPR
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Yang, S.; Wu, T.; Zhao, X.; Li, X.; Tan, W. The Optical Property of Core-Shell Nanosensors and Detection of Atrazine Based on Localized Surface Plasmon Resonance (LSPR) Sensing. Sensors 2014, 14, 13273-13284.

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