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Partially reduced graphene oxide based FRET on fiber-optic interferometer for biochemical detection.

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Summary

This study introduces a novel

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Biomedical Engineering
  • Optical Sensing

Background:

  • Fluorescent resonance energy transfer (FRET) is a powerful technique for chemical and biomedical analysis.
  • Conventional FRET faces challenges in achieving high sensitivity and compactness for sensor applications.
  • Fiber-optic sensors offer high sensitivity and compactness but often lack selectivity.

Purpose of the Study:

  • To develop a novel 'FRET on Fiber' sensing platform.
  • To integrate FRET with fiber-optic sensing for enhanced analytical performance.
  • To achieve simultaneous high-sensitivity and high-selectivity detection of analytes.

Main Methods:

  • A partially reduced graphene oxide (prGO) film was deposited onto a fiber-optic modal interferometer.
  • The prGO film acted as both a FRET quencher and a refractive index-sensitive cladding.
  • Simultaneous measurement of fluorescence recovery (FRET) and optical phase shift (interferometer) was performed.

Main Results:

  • The 'FRET on Fiber' system demonstrated high sensitivity and selectivity for target analytes.
  • Detection limits were achieved at 1.2 nM for metal ions, 1.3 μM for dopamine, and 1 pM for single-stranded DNA (ssDNA).
  • Simultaneous detection of analyte-induced fluorescence recovery and optical phase shift was successful.

Conclusions:

  • The prGO-based 'FRET on Fiber' configuration effectively bridges FRET and fiber-optic sensing.
  • This platform enables the development of compact, highly sensitive, and selective integrated sensors.
  • The technology holds promise for on-line environmental, chemical, and biomedical monitoring applications.