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A Silver Nanoparticle-Modified Evanescent Field Optical Fiber Sensor for Methylene Blue Detection
State Key Laboratory of Optical Technologies on Nano-Fabrication and Mirco-Engineering, Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China
Lightweight Optics and Advanced Materials Technology Center, Chinese Academy of Sciences, Chengdu 610209, China
Department of Communication Engineering, Chengdu University of Information Technology, Chengdu 610225, China
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
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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Cite This Article
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.
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.
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.