Sensors 2013, 13(3), 3986-3997; doi:10.3390/s130303986
Article

A Silver Nanoparticle-Modified Evanescent Field Optical Fiber Sensor for Methylene Blue Detection

1 State Key Laboratory of Optical Technologies on Nano-Fabrication and Mirco-Engineering, Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China 2 Lightweight Optics and Advanced Materials Technology Center, Chinese Academy of Sciences, Chengdu 610209, China 3 Department of Communication Engineering, Chengdu University of Information Technology, Chengdu 610225, China 4 East China Institute of Optoelectronic Integrated Devices, Bengbu 233042, China
* Authors to whom correspondence should be addressed.
Received: 29 January 2013; in revised form: 5 March 2013 / Accepted: 7 March 2013 / Published: 21 March 2013
(This article belongs to the Section Chemical Sensors)
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Abstract: A silver nanoparticle-modified evanescent field optical fiber sensor based on a MEMS microchannel chip has been successfully fabricated. Experimental results show that the sensor response decreases linearly with increasing concentration of analyte. Over a range of methylene blue concentrations from 0 to 0.4 μmol/mL, the sensor response is linear (R = 0.9496). A concentration variation of 0.1 μmol/mL can cause an absorbance change of 0.402 dB. Moreover, the optical responses of the same sensing fiber without decoration and modified with silver nanoparticles have also been compared. It can be observed that the output intensity of the Ag nanoparticle-modified sensor is enhanced and the sensitivity is higher. Meanwhile, the absorbance spectra are found to be more sensitive to concentration changes compared to the spectra of the peak wavelength.
Keywords: evanescent field optical fiber sensors; silver nanoparticles; MEMS microchannel chip; sensitivity; methylene blue detection

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MDPI and ACS Style

Luo, J.; Yao, J.; Lu, Y.; Ma, W.; Zhuang, X. A Silver Nanoparticle-Modified Evanescent Field Optical Fiber Sensor for Methylene Blue Detection. Sensors 2013, 13, 3986-3997.

AMA Style

Luo J, Yao J, Lu Y, Ma W, Zhuang X. A Silver Nanoparticle-Modified Evanescent Field Optical Fiber Sensor for Methylene Blue Detection. Sensors. 2013; 13(3):3986-3997.

Chicago/Turabian Style

Luo, Ji; Yao, Jun; Lu, Yonggang; Ma, Wenying; Zhuang, Xuye. 2013. "A Silver Nanoparticle-Modified Evanescent Field Optical Fiber Sensor for Methylene Blue Detection." Sensors 13, no. 3: 3986-3997.

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