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

Sensors

Ji Luo¹  Jun Yao¹  Yonggang Lu²  Wenying Ma³ 

[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;Lightweight Optics and Advanced Materials Technology Center, Chinese Academy of Sciences, Chengdu 610209, China; E-Mail:;Department of Communication Engineering, Chengdu University of Information Technology, Chengdu 610225, China; E-Mail:

关键词: evanescent field optical fiber sensors;    silver nanoparticles;    MEMS microchannel chip;    sensitivity;    methylene blue detection;   

DOI  :  10.3390/s130303986

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2013 by the authors; licensee MDPI, Basel, Switzerland.