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Related Experiment Videos

Pure shear horizontal SAW biosensor on langasite.

Eric Berkenpas1, Shivashanker Bitla, Paul Millard

  • 1University of Maine, Orono, ME, USA. mdacunha@eece.maine.edu

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|December 17, 2004
PubMed
Summary

This study introduces a new langasite (LGS) shear horizontal surface acoustic wave (SH SAW) biosensor for detecting pathogens in liquids. The LGS SH SAW device shows promise for sensitive and selective microbial detection in aqueous solutions.

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Area of Science:

  • Materials Science
  • Biotechnology
  • Sensor Technology

Background:

  • Pathogen contamination of food and water poses significant risks.
  • Rapid, sensitive, and selective microbial detection is crucial for public health and security.
  • Shear horizontal surface acoustic wave (SH SAW) devices are suitable for liquid-phase sensing, unlike Rayleigh-type modes.

Purpose of the Study:

  • To design and fabricate an exploratory SH SAW delay line using langasite (LGS) on a novel Euler propagation direction.
  • To evaluate the performance of the LGS SH SAW device in liquid media for sensing applications.
  • To demonstrate the potential of LGS SH SAW devices as biochemical detectors for biosensing.

Main Methods:

  • Fabrication of a shear horizontal surface acoustic wave (SH SAW) delay line on langasite (LGS) along the (0°, 22°, 90°) Euler direction.

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  • Assembly of a liquid chamber and testing of the device in liquid media.
  • Characterization of the LGS SH SAW device by sequential binding of biomolecules (avidin, IgG, antibody) to a functionalized surface.

    • Main Results:

    • The LGS SH SAW delay line exhibited moderate additional attenuation (6 dB) in liquid tests, indicating suitability for liquid sensing.
    • The device demonstrated sensitivity to sequential biomolecule binding, showing marked changes in the delay-line phase.
    • This work represents the first use of LGS in surface acoustic wave (SAW)-based biosensor technology.

    Conclusions:

    • Langasite (LGS) is a promising material for developing shear horizontal surface acoustic wave (SH SAW) biosensors for liquid environments.
    • The fabricated LGS SH SAW devices can function as effective biochemical detectors in aqueous solutions.
    • Further integration with recognition layers can enhance sensor selectivity for specific microbial pathogens.