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Borate-driven ionic rectifiers based on sugar-bearing single nanochannels.

Vanina M Cayón1, Gregorio Laucirica, Yamili Toum Terrones

  • 1Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, CONICET - CC 16 Suc. 4, 1900 La Plata, Argentina. azzaroni@inifta.unlp.edu.ar.

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|June 21, 2021
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Summary
This summary is machine-generated.

Scientists developed a novel nanochannel device that selectively detects borate and fructose. This sensor uses surface charge changes to reversibly switch between ON and OFF states, enabling applications in molecular sensing.

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Analytical Chemistry

Background:

  • Controlling ionic transport in solid-state nanochannels is crucial for developing advanced chemical sensors.
  • Integrating chemical systems with nanochannels allows for molecule-specific detection and response.

Purpose of the Study:

  • To fabricate a novel nanofluidic device using silane chemistry, track-etched, and atomic layer deposition (ALD) technologies.
  • To create a gluconamide-decorated nanochannel surface for selective molecular interactions.
  • To investigate the iontronic property changes induced by borate binding.

Main Methods:

  • Fabrication of single-pore nanochannels coated with silica (SiO2) via ALD.
  • Surface modification using N-(3-triethoxysilylpropyl)-gluconamide to create a gluconamide-decorated surface.
  • Analysis of surface charge density and iontronic property variations upon borate interaction.

Main Results:

  • Demonstrated selective and reversible detection of borate and fructose.
  • Observed significant changes in nanochannel iontronic properties due to borate-saccharide binding.
  • Developed a binding model for the saccharide-borate interaction.
  • Achieved reversible switching between "ON" and "OFF" states based on borate and fructose presence.

Conclusions:

  • The novel nanodevice offers a promising platform for selective molecular sensing and separation.
  • The study reports the first functionalization of PET/SiO2 nanochannels using ALD.
  • This technology has potential applications in water quality monitoring and directed molecular transport.