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Related Experiment Video

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Attaching Biological Probes to Silica Optical Biosensors Using Silane Coupling Agents

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Published on: May 1, 2012

Coupled Nanomechanical Resonator with Protein-Interaction Vibration for an Ultrasensitive Label-Free Biosensor.

Ryo Hirose¹, Takuya Haraguchi¹, Akira Nagakubo²

¹Graduate School of Engineering, The University of Osaka, Suita, Osaka 560-0871, Japan.

ACS Applied Materials & Interfaces

|April 2, 2025

Summary

This study introduces a novel ultrasensitive mechanical-resonator biosensor. By leveraging avoided crossing, it achieves a 10x greater frequency change for enhanced molecular detection, even in serum.

Keywords:

CRP coupled resonator mechanical biosensor multilayer graphene picosecond ultrasound serum

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Last Updated: Apr 13, 2026

Attaching Biological Probes to Silica Optical Biosensors Using Silane Coupling Agents

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Published on: December 29, 2015

Area of Science:

Nanotechnology
Biosensing
Materials Science

Background:

Mechanical-resonator biosensors detect molecules via mass-loading effects on resonant frequency.
Improving sensitivity typically involves thinning resonator thickness.
Existing methods face limitations in detection sensitivity.

Purpose of the Study:

To develop a more effective strategy for ultrasensitive mechanical-resonator biosensors.
To enhance detection sensitivity beyond traditional mass-loading effects.
To enable label-free detection of biomarkers at low concentrations.

Main Methods:

Developed an ultrahigh-frequency nanomechanical resonator using multilayer graphene.
Operated the resonator near a specific interaction frequency (∼30 GHz) to induce energy coupling.
Utilized the 'avoided crossing' phenomenon for amplified frequency shifts.

Main Results:

Achieved a resonator-frequency change approximately 10 times greater than mass-loading effects near the avoided crossing.
Demonstrated label-free detection of C-reactive protein.
Established a detection limit of 10 pg/mL or less, even in serum samples.

Conclusions:

The proposed strategy significantly enhances mechanical-resonator biosensor sensitivity.
Ultrahigh-frequency graphene resonators coupled with avoided crossing offer a powerful platform for ultrasensitive biosensing.
This approach enables highly sensitive, label-free detection of clinically relevant biomarkers.