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Open AccessArticle

Chemical Sensing Sensitivity of Long-Period Grating Sensor Enhanced by Colloidal Gold Nanoparticles

1
Department of Physics, National Chung Cheng University, 168 University Road, Chia-Yi 621, Taiwan
2
Department of Construction Engineering, National Yunlin University of Science and Technology, Yun-Lin 640, Taiwan
*
Author to whom correspondence should be addressed.
Sensors 2008, 8(1), 171-184; https://doi.org/10.3390/s8010171
Received: 13 November 2007 / Accepted: 4 January 2008 / Published: 21 January 2008
A simple and effective method is proposed to improve spectral sensitivity anddetection limit of long period gratings for refractive index or chemical sensing, where thegrating surface is modified by a monolayer of colloidal gold nanoparticles. Thetransmission spectra and optical properties of gold nanospheres vary with the differentrefractive index of the environment near the surface of gold nanospheres. The sensorresponse of gold colloids increases linearly with solvents of increasing refractive index.The results for the measurement of sucrose and sodium chloride solutions are reported,which show that this type of sensor can provide a limiting resolution of ~10-3 to ~10-4 forrefractive indices in the range of 1.34 to 1.39 and a noticeable increase in detection limit ofrefractive index to external medium. View Full-Text
Keywords: Spectral sensitivity; refractive index; long-period grating; colloidal gold nanoparticles; localized surface plasmon resonance. Spectral sensitivity; refractive index; long-period grating; colloidal gold nanoparticles; localized surface plasmon resonance.
MDPI and ACS Style

Tang, J.-L.; Wang, J.-N. Chemical Sensing Sensitivity of Long-Period Grating Sensor Enhanced by Colloidal Gold Nanoparticles. Sensors 2008, 8, 171-184.

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