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Development and Functionalization of Electrolyte-Gated Graphene Field-Effect Transistor for Biomarker Detection
Published on: February 1, 2022
Flexible FET-type VEGF aptasensor based on nitrogen-doped graphene converted from conducting polymer
Oh Seok Kwon1, Seon Joo Park, Jin-Yong Hong
1World Class University Program of Chemical Convergence for Energy & Environment, School of Chemical and Biological Engineering, Seoul National University, Seoul 151-742, Korea.
ACS Nano
|January 10, 2012
Summary
Researchers developed a novel nitrogen-doped graphene sensor for detecting cancer biomarkers. This flexible aptasensor achieves high sensitivity at ultra-low concentrations, offering a promising tool for early cancer detection.
Area of Science:
- Materials Science: Development of novel graphene-based materials for electronic applications.
- Nanotechnology: Fabrication and application of nanostructured materials for sensing.
- Biomedical Engineering: Design of biosensors for disease biomarker detection.
Background:
- Graphene-based field-effect transistors (FETs) are emerging as a post-silicon electronics alternative.
- Existing biosensors often lack the sensitivity and flexibility required for point-of-care diagnostics.
- Vascular Endothelial Growth Factor (VEGF) is a key biomarker for various cancers.
Purpose of the Study:
- To develop a novel method for fabricating nitrogen-doped few-layer graphene (NDFLG) using conducting polymers.
- To create a high-performance, flexible FET-type aptasensor for sensitive detection of VEGF.
- To demonstrate the potential of this aptasensor for early cancer biomarker detection.
Main Methods:
- Polypyrrole-converted nitrogen-doped few-layer graphene (PPy-NDFLG) synthesized via chemical vapor deposition and vapor deposition polymerization on a Cu substrate.
- Transfer of PPy-NDFLG onto a flexible substrate.
- Integration of anti-VEGF RNA aptamer-conjugated PPy-NDFLG into a liquid-ion gated FET geometry for aptasensor fabrication.
Main Results:
- Achieved field-induced high sensitivity for analyte-binding events.
- Demonstrated detection of vascular endothelial growth factor (VEGF) at an unprecedentedly low concentration of 100 fM.
- The developed aptasensor exhibited excellent reusability, mechanical bendability, and durability.
Conclusions:
- Successfully fabricated N-doped graphene using conducting polymers as a carbonization precursor.
- Developed a high-performance, flexible FET-type aptasensor capable of ultra-sensitive VEGF detection.
- This technology offers a promising platform for developing advanced diagnostic tools for cancer biomarkers.
