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Engineering Molecular Recognition with Bio-mimetic Polymers on Single Walled Carbon Nanotubes
Published on: January 10, 2017
Nanotubes complexed with DNA and proteins for resistive-pulse sensing
Jingjie Sha1, Tawfique Hasan, Silvia Milana
1School of Mechanical Engineering, Southeast University , Nanjing 210096, China.
ACS Nano
|September 27, 2013
Summary
We analyzed single-wall carbon nanotube (SWNT) hybrids with DNA or protein using nanopore sensing. This method allows for the detection of small molecules by observing their physical properties during translocation.
Area of Science:
- Nanotechnology
- Biophysics
- Materials Science
Background:
- Single-wall carbon nanotubes (SWNTs) are versatile nanomaterials with unique electronic and physical properties.
- Analyzing molecular hybrids at the single-molecule level is crucial for understanding their behavior and developing new sensing applications.
Purpose of the Study:
- To investigate the physical characteristics of SWNT-DNA and SWNT-protein molecular hybrids.
- To explore the use of resistive-pulse technique in nanopores for single-molecule analysis of these hybrids.
- To establish a foundation for direct sensing of small biomolecules using SWNTs as carriers.
Main Methods:
- Utilized a resistive-pulse technique employing a glass capillary nanopore.
- Applied electric fields to translocate molecular hybrids through the nanopore.
- Measured translocation duration and event current to probe size, surface properties, and ion dynamics.
Main Results:
- Translocation duration correlates with the hydrodynamic size and solution mobility of the SWNT hybrids.
- Event current analysis revealed ion exclusion effects and potential polarization of the SWNT core.
- Demonstrated the capability to analyze molecular hybrids at the single-molecule level.
Conclusions:
- Resistive-pulse sensing in nanopores provides a powerful tool for characterizing SWNT-based molecular hybrids.
- The findings support the use of SWNT nanofilaments as carriers for direct sensing of small DNA or protein molecules.
- This approach offers a pathway for developing novel biosensing platforms.
