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Thermal Measurement Techniques in Analytical Microfluidic Devices
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The hot-wire concept: Towards a one-element thermal biosensor platform.

Mehran Khorshid1, Soroush Bakhshi Sichani1, Peter Cornelis1

  • 1KU Leuven, Department of Physics and Astronomy, Laboratory for Soft Matter and Biophysics, Celestijnenlaan 200 D, B-3001, Leuven, Belgium.

Biosensors & Bioelectronics
|February 20, 2021
PubMed
Summary
This summary is machine-generated.

This study introduces a novel biosensing platform using a 3ω hot-wire concept. This method detects analytes by measuring changes in thermal interface conductance, offering a sensitive and versatile approach for various biological applications.

Keywords:
3ω principleLabel-free bio- and chemosensorsNucleic acidsThermal waves

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Area of Science:

  • Biosensing
  • Nanotechnology
  • Physical Chemistry

Background:

  • Traditional biosensors often require complex fabrication and multiple sensing elements.
  • Detecting analytes based on thermal properties offers a unique sensing mechanism.

Purpose of the Study:

  • To explore the 3ω hot-wire concept as a novel biosensing platform.
  • To demonstrate analyte detection via changes in thermal interface conductance.

Main Methods:

  • Immobilizing a receptor layer (e.g., DNA) on a thin aluminum wire.
  • Heating the wire with alternating current (ω) and measuring the third harmonic voltage (3ω).
  • Analyzing the 3ω voltage amplitude's sensitivity to the biofunctional interface layer.

Main Results:

  • The 3ω voltage amplitude significantly changes based on the composition and conformation of the interface layer.
  • Demonstrated differences in heat transfer for bare wires, silane-coated wires, and DNA-tethered wires.
  • Heat transfer variations were measurable in both liquid and air environments.

Conclusions:

  • The 3ω hot-wire concept is a viable biosensing platform with a single sensing element.
  • Potential applications include mutation analysis and analyte detection using aptamers or MIPs.
  • The platform is scalable, miniaturizable, and adaptable to different materials and receptors.