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Molecularly Imprinted Polymer-Coated Optical Waveguide for Attogram Sensing.

Yingtao Zhou1, YingYing Xu1, Gongjie Xu1

  • 1School of Optical Electrical and Computer Engineering, University of Shanghai for Science and Technology, No. 516 Jungong Road, Shanghai 200093, China.

ACS Applied Materials & Interfaces
|April 1, 2022
PubMed
Summary
This summary is machine-generated.

This study presents a novel optical fiber sensor using molecularly imprinted polymers (MIPs) for ultra-sensitive detection. The sensor achieves exceptional selectivity and a record-low detection limit for Rhodamine B, crucial for environmental monitoring.

Keywords:
OFWFRh Battogram sensingmolecularly imprinted polymeroptical fiber sensor

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Optical Engineering

Background:

  • Developing sensors with ultrahigh sensitivity and selectivity is critical for various applications.
  • Existing sensing platforms often face limitations in detection limits and specificity.
  • Contamination by dyes like Rhodamine B poses significant public health and environmental concerns.

Purpose of the Study:

  • To develop a highly sensitive and selective sensing platform by integrating an optical fiber-waveguide-fiber (OFWF) structure with a molecularly imprinted polymer (MIP).
  • To demonstrate the platform's capability for ultra-trace detection of Rhodamine B, a common textile industry contaminant.

Main Methods:

  • Fabrication of a sensing platform combining an OFWF structure with a MIP layer.
  • MIP synthesis using 2-phenylphenoxyethyl acrylate and acrylic acid, with poly(ethylene glycol) 600 diacrylate cross-linker.
  • Curing the MIP layer on the waveguide surface using evanescent wave technology with 405 nm light.
  • Testing the platform's selectivity and sensitivity using Rhodamine B and methyl blue mixtures.

Main Results:

  • The MIP-OFWF platform demonstrated highly selective monitoring of Rhodamine B absorption spectra in a mixture.
  • Achieved an extremely low detection limit of approximately 6.5 × 10-17 g/mL (20-30 ag absolute mass).
  • The MIP design enhanced probe light extraction and analyte penetrability.

Conclusions:

  • The developed MIP-OFWF sensing platform offers a promising solution for ultrahigh sensitivity and selectivity in chemical sensing.
  • This technology has significant potential for environmental monitoring and public health applications, particularly for detecting dye contaminants.
  • The integration of optical waveguides with MIPs provides a robust and efficient approach for trace analysis.