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Label-free Single Molecule Detection Using Microtoroid Optical Resonators
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Solidly mounted resonator sensor for biomolecule detections.

Chengzhang Han1,2, Xia Wang1, Qiuling Zhao1

  • 1Optoelectronic Materials and Technologies Engineering Laboratory, Shandong, Physics Department, Qingdao University of Science and Technology Qingdao 266042 China phwangxia@163.com sdqlzhao@163.com.

RSC Advances
|May 6, 2022
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Summary
This summary is machine-generated.

This study presents a new solidly mounted resonator (SMR) biosensor for detecting biological molecules. The SMR demonstrates a linear response to antigen concentration, showing promise for sensitive biomolecule detection.

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Area of Science:

  • Materials Science
  • Biosensors
  • Nanotechnology

Background:

  • Solidly Mounted Resonators (SMRs) are valuable for sensing applications.
  • Developing selective and sensitive biosensors is crucial for disease diagnostics.
  • Aluminum Nitride (AlN) piezoelectric films offer excellent properties for SMR fabrication.

Purpose of the Study:

  • To fabricate and characterize a novel SMR capable of functioning as a biosensor.
  • To investigate the SMR's performance in detecting specific biological molecules.
  • To evaluate the sensor's sensitivity, selectivity, and response linearity.

Main Methods:

  • Fabrication of an SMR using radio frequency (RF) magnetron sputtering on a silicon substrate.
  • Immobilization of Human Immunoglobulin G (IgG) antibody onto the gold electrode surface.
  • Detection of goat anti-human IgG antigen via antibody-antigen binding.
  • Analysis of resonant frequency shift in response to varying antigen concentrations.

Main Results:

  • A linear relationship was observed between resonant frequency shift and goat anti-human IgG antigen concentration (<0.4 mg ml⁻¹).
  • The SMR sensor exhibited satisfactory selectivity in interference experiments.
  • The fabricated SMR demonstrated effective biomolecule detection capabilities.

Conclusions:

  • The developed SMR biosensor offers a promising platform for sensitive and selective biomolecule detection.
  • The metal Bragg acoustic reflector design enhances heat conduction and reduces internal stress.
  • This SMR sensor presents an attractive alternative for various biological sensing applications.