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Related Concept Videos

Fluorescence and Phosphorescence: Instrumentation01:25

Fluorescence and Phosphorescence: Instrumentation

Fluorometers and spectrofluorometers are two types of instruments used for measuring molecular fluorescence. These instruments differ in how they select excitation and emission wavelengths and the type of light sources they utilize. Fluorometers use absorption interference filters to choose excitation and emission wavelengths. The excitation source in a fluorometer is typically a low-pressure mercury vapor lamp that emits intense lines distributed throughout the ultraviolet and visible regions.
Photoluminescence: Applications01:14

Photoluminescence: Applications

Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...

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Multicolor Fluorescence Detection for Droplet Microfluidics Using Optical Fibers
10:21

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Published on: May 5, 2016

Fluorescence pH probe based on microstructured polymer optical fiber.

X H Yang, L L Wang

    Optics Express
    |June 25, 2009
    PubMed
    Summary
    This summary is machine-generated.

    A novel optical pH sensor utilizes eosin-doped cellulose acetate (CA) in microstructured polymer optical fibers (MPOF) for fluorescence-based detection. The sensor

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    Last Updated: Jun 22, 2026

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    Fabrication and Characterization of Disordered Polymer Optical Fibers for Transverse Anderson Localization of Light
    09:19

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    Published on: July 29, 2013

    Area of Science:

    • Optical Sensors
    • Materials Science
    • Chemical Sensing

    Background:

    • Microstructured polymer optical fibers (MPOF) offer unique platforms for sensor development.
    • Fluorescence-based sensing provides high sensitivity for detecting chemical species.
    • Cellulose acetate (CA) is a versatile polymer for fabricating thin films.

    Purpose of the Study:

    • To demonstrate a novel optical pH sensor.
    • To utilize eosin-doped cellulose acetate (CA) thin-film modified microstructured polymer optical fiber (MPOF) for pH sensing.
    • To investigate the tunability of the sensor's pH response range.

    Main Methods:

    • Fabrication of the sensing film by infiltrating an eosin-CA-acetic acid solution into MPOF.
    • Solvent removal (acetic acid) to form the sensing layer within the MPOF.
    • Characterization of fluorescence intensity changes in response to varying pH levels (2.5-4.5).
    • Modification of the pH response range by doping with hexadecyl trimethyl ammonium bromide (CTAB).

    Main Results:

    • The eosin-doped CA thin-film modified MPOF exhibited distinct fluorescence intensity changes across a pH range of 2.5 to 4.5.
    • The pH sensing capability was confirmed through fluorescence intensity measurements.
    • Doping with CTAB allowed for tailoring the effective pH response range of the sensor.

    Conclusions:

    • A functional optical pH sensor based on eosin-doped CA/MPOF has been successfully demonstrated.
    • The sensor shows promise for sensitive pH detection within a specific acidic range.
    • The ability to tune the response range using CTAB enhances the sensor's versatility for different applications.