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      Is Open Access

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

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          There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

          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.

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          Review of the present status of optical fiber sensors

          Byoungho Lee (2003)
          Article 0 comments Cited 211 times – based on 0 reviews     Review now
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            Colloidal gold-modified optical fiber for chemical and biochemical sensing.

            Shu-Fang Cheng, Lai-Kwan Chau (2003)
            A novel class of fiber-optic evanescent-wave sensor was constructed on the basis of modification of the unclad portion of an optical fiber with self-assembled gold colloids. The optical properties and, hence, the attenuated total reflection spectrum of self-assembled gold colloids on the optical fiber changes with different refractive index of the environment near the colloidal gold surface. With sucrose solutions of increasing refractive index, the sensor response decreases linearly. The colloidal gold surface was also functionalized with glycine, succinic acid, or biotin to enhance the selectivity of the sensor. Results show that the sensor response decreases linearly with increasing concentration of each analyte. When the colloidal gold surface was functionalized with biotin, the detection limit of the sensor for streptavidin was 9.8 x 10(-11) M. Using this approach, we demonstrate proof-of-concept of a class of refractive index sensor that is sensitive to the refractive index of the environment near the colloidal gold surface and, hence, is suitable for label-free detection of molecular or biomolecular binding at the surface of gold colloids.
            Article 0 comments Cited 48 times – based on 0 reviews     Review now
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              Evanescent field-based optical fiber sensing device for measuring the refractive index of liquids in microfluidic channels.

              Pavel Polynkin, N. Peyghambarian, Alexander Polynkin … (2005)
              We report a simple optical sensing device capable of measuring the refractive index of liquids propagating in microfluidic channels. The sensor is based on a single-mode optical fiber that is tapered to submicrometer dimensions and immersed in a transparent curable soft polymer. A channel for liquid analyte is created in the immediate vicinity of the taper waist. Light propagating through the tapered section of the fiber extends into the channel, making the optical loss in the system sensitive to the refractive-index difference between the polymer and the liquid. The fabrication process and testing of the prototype sensing devices are described. The sensor can operate both as a highly responsive on-off device and in the continuous measurement mode, with an estimated accuracy of refractive-index measurement of approximately 5 x 10(-4).
              Article 0 comments Cited 47 times – based on 0 reviews     Review now
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                Author and article information

                Journal
                Journal ID (nlm-ta): Sensors (Basel)
                Journal ID (iso-abbrev): Sensors (Basel)
                Title: Sensors (Basel, Switzerland)
                Publisher: Molecular Diversity Preservation International (MDPI)
                ISSN (Electronic): 1424-8220
                Publication date Collection: March 2013
                Publication date (Electronic): 21 March 2013
                Volume: 13
                Issue: 3
                Pages: 3986-3997
                Affiliations
                [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; E-Mail: Chuck350@ 123456yahoo.cn
                [3 ] Department of Communication Engineering, Chengdu University of Information Technology, Chengdu 610225, China; E-Mail: mwy@ 123456cuit.edu.cn
                [4 ] East China Institute of Optoelectronic Integrated Devices, Bengbu 233042, China; E-Mail: zxye8888@ 123456hotmail.com
                Author notes
                [* ] Authors to whom correspondence should be addressed; E-Mails: rockyluoji@ 123456163.com (J.L.); junyao@ 123456ioe.ac.cn (J.Y.); Tel.: +86-28-8510-0608; Fax: +86-28-8510-0203.
                Article
                Publisher ID: sensors-13-03986
                DOI: 10.3390/s130303986
                PMC ID: 3658787
                PubMed ID: 23519353
                SO-VID: 828661e6-f648-4d6f-afef-ccbdc96f942a
                Copyright © © 2013 by the authors; licensee MDPI, Basel, Switzerland.
                License:

                This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license ( http://creativecommons.org/licenses/by/3.0/).

                History
                Date received : 29 January 2013
                Date revision received : 05 March 2013
                Date accepted : 07 March 2013
                Categories
                Subject: Article

                ScienceOpen disciplines: Biomedical engineering
                Keywords: evanescent field optical fiber sensors,silver nanoparticles,mems microchannel chip,sensitivity,methylene blue detection
                Data availability:
                ScienceOpen disciplines: Biomedical engineering
                Keywords: evanescent field optical fiber sensors, silver nanoparticles, mems microchannel chip, sensitivity, methylene blue detection

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