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Fabrication of Carbon Nanotube High-Frequency Nanoelectronic Biosensor for Sensing in High Ionic Strength Solutions
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A new solid-state anionic surfactant-selective sensor based on functionalized MWCNT.

Mateja Budetić1, Mirela Samardžić1, Gabriela Ravnjak1

  • 1Department of Chemistry, Josip Juraj Strossmayer University of Osijek, Cara Hadrijana 8/A, 31000, Osijek, Croatia.

Talanta
|March 7, 2021
PubMed
Summary
This summary is machine-generated.

A novel solid-state sensor using functionalized multi-walled carbon nanotubes (MWCNTs) enables rapid and selective detection of anionic surfactants (AnS). This advancement offers precise determination of AnS in complex mixtures and real-world samples.

Keywords:
Anionic surfactantsDetergentsMulti-walled carbon nanotubesPotentiometric sensor

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Area of Science:

  • Electroanalytical Chemistry
  • Materials Science
  • Environmental Monitoring

Background:

  • Accurate determination of anionic surfactants (AnS) is crucial for environmental and industrial applications.
  • Existing methods for AnS detection often face challenges with selectivity and response time.
  • Development of novel sensor materials is needed for improved analytical performance.

Purpose of the Study:

  • To develop and characterize a new solid-state potentiometric sensor for anionic surfactant determination.
  • To evaluate the sensor's performance, including its Nernstian response, limit of detection, and response time.
  • To assess the sensor's selectivity and applicability in real-world samples and complex mixtures.

Main Methods:

  • Fabrication of a liquid membrane sensor incorporating multi-walled carbon nanotubes (MWCNTs) functionalized with quaternary ammonium groups and tetraphenylborate anions (MWCNT-N+(CH3)3TPB-).
  • Potentiometric measurements to assess sensor response to sodium dodecyl sulfate (NaDDS) and sodium dodecylbenzenesulfonate (NaDBS).
  • Evaluation of sensor selectivity against common interfering anions and nonionic surfactants.
  • Application of the sensor in potentiometric titration for AnS determination across a pH range of 3-12.

Main Results:

  • The MWCNT-N+(CH3)3TPB- sensor exhibited a Nernstian response (59.3 mV/decade) for both NaDDS and NaDBS.
  • Achieved low limits of detection: 2.0 × 10⁻⁷ M for NaDDS and 1.5 × 10⁻⁷ M for NaDBS.
  • Demonstrated rapid average response time of only 5 seconds.
  • Showed high selectivity for NaDDS over common anions and was unaffected by nonionic surfactants.
  • Successfully applied the sensor for AnS determination in three-component mixtures and real systems.

Conclusions:

  • The developed solid-state potentiometric sensor based on functionalized MWCNTs offers a promising tool for sensitive and selective AnS determination.
  • The sensor's rapid response, low detection limits, and robustness make it suitable for practical analytical applications.
  • This sensor represents a significant advancement for monitoring anionic surfactants in environmental and industrial contexts.