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Ultrasensitive Detection of Biomarkers by Using a Molecular Imprinting Based Capacitive Biosensor
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Highly sensitive biosensor based on UV-imprinted layered polymeric-inorganic composite waveguides.

Meng Wang1, Jussi Hiltunen, Christina Liedert

  • 1Optoelectronics and Measurement Techniques Laboratory, University of Oulu, PO Box 4500, 90014 Finland. meng.wang@ee.oulu.fi

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|October 6, 2012
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Summary

This study presents a novel polymer-inorganic composite waveguide sensor for highly sensitive refractive index and molecular adsorption detection. The developed sensor demonstrates enhanced stability and specific molecular detection capabilities.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Sensor Technology

Background:

  • Evanescent field sensors are crucial for detecting minute changes in refractive index and molecular adsorption.
  • Polymeric waveguides offer flexibility but often suffer from water absorption and limited sensitivity.
  • Inorganic thin films can enhance waveguide performance but integrating them with polymers presents challenges.

Purpose of the Study:

  • To develop a high-performance evanescent field sensor using a layered polymeric-inorganic composite waveguide.
  • To investigate the sensor's capability for precise refractive index and molecular adsorption detection.
  • To evaluate the impact of inorganic coating on sensor sensitivity, stability, and water resistance.

Main Methods:

  • Fabrication of a UV-imprint patterned polymer inverted rib waveguide.
  • Sputter deposition of a tantalum pentoxide (Ta2O5) thin film on low refractive index polymer layers.
  • Characterization of the composite waveguide's performance for refractive index sensing.
  • Assessment of molecular adsorption detection limits and antibody-antigen binding specificity.

Main Results:

  • Achieved a detection limit of 3 × 10⁻⁷ refractive index units (RIU) for refractive index sensing.
  • Demonstrated a molecular adsorption detection limit of approximately 100 fg/mm².
  • The inorganic coating significantly enhanced sensitivity and effectively blocked water absorption, ensuring stabilized sensor operation.
  • Confirmed the sensor's ability for specific molecular detection through antibody-antigen binding assays.

Conclusions:

  • The developed layered polymeric-inorganic composite waveguide sensor offers high performance for biochemical sensing applications.
  • The integration of inorganic thin films with polymer waveguides provides a pathway to overcome limitations of polymer-only sensors.
  • This sensor technology holds promise for advanced applications in diagnostics and environmental monitoring.