The effect of ionic species on pH dependent response of silica coated optical fibers

Jacqueline Elwood; Paul R. Ohodnicki Jr.

doi:10.1117/12.2224959

17 May 2016 The effect of ionic species on pH dependent response of silica coated optical fibers

Jacqueline Elwood, Paul R. Ohodnicki Jr.

Proceedings Volume 9836, Micro- and Nanotechnology Sensors, Systems, and Applications VIII; 98360I (2016) https://doi.org/10.1117/12.2224959
Event: SPIE Defense + Security, 2016, Baltimore, MD, United States

Abstract

Optical fiber pH sensors functionalized with a gold nanoparticle (AuNP)/porous silica film were developed. The transmission of light through the fiber is affected by the change in the refractive index of the porous silica-based nanocomposite coated film as ionic species are concentrated into the coating film when the silica surface becomes negatively charged with increasing pH. To investigate the dependence of the response on the ionic species in solution, we report the optical response of Au/silica film coated fibers in a variety of salt solutions. The response is indeed sensitive to different ionic species in solution. The details of the response are likely also sensitive to the microstructure of the porous silica-based sensing layer.

Citation Download Citation

Jacqueline Elwood and Paul R. Ohodnicki Jr. "The effect of ionic species on pH dependent response of silica coated optical fibers", Proc. SPIE 9836, Micro- and Nanotechnology Sensors, Systems, and Applications VIII, 98360I (17 May 2016); https://doi.org/10.1117/12.2224959

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