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Related Experiment Video

Updated: Jun 12, 2026

Fabrication of Carbon Nanotube High-Frequency Nanoelectronic Biosensor for Sensing in High Ionic Strength Solutions

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Published on: July 22, 2013

Using Electrostatic Mapping to Understand PANI-MWCNTs' NH₃ Sensing.

Alessia Famengo¹, Carmen Marinela Mihailescu², Mihaela Savin²

¹Institute of Condensed Matter Chemistry and Technologies for Energy-National Research Council of Italy (CNR-ICMATE), 35127 Padua, Italy.

Sensors (Basel, Switzerland)

|April 14, 2026

Summary

This summary is machine-generated.

This study reveals that incorporating multi-walled carbon nanotubes into polyaniline enhances ammonia sensing. The composite

Keywords:

MWCNTs NH3 sensor PANI charge delocalization electrochemical impedance spectroscopy electrostatic force microscopy

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Last Updated: Jun 12, 2026

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A Polyaniline-based Sensor of Nucleic Acids

A Polyaniline-based Sensor of Nucleic Acids

Published on: November 1, 2016

Area of Science:

Materials Science
Electrochemistry
Nanotechnology

Background:

Polyaniline (PANI) is a conductive polymer with potential for gas sensing.
Understanding the nanostructure and charge transport is crucial for optimizing PANI-based sensors.

Purpose of the Study:

To investigate the electrostatic and electrochemical properties of PANI and PANI/MWCNT-NH2 composite.
To elucidate the sensing mechanisms of ammonia (NH3) in these materials.

Main Methods:

Atomic Force Microscopy (AFM) and Electrostatic Force Microscopy (EFM) for nanoscale morphology and charge distribution.
Cyclic Voltammetry (CV) and Electrochemical Impedance Spectroscopy (EIS) for electrochemical behavior.
Exposure to ammonia (NH3) to evaluate sensing response.

Main Results:

Pristine PANI shows granular structures with localized charges.
MWCNT incorporation forms percolative networks, enhancing charge delocalization and conductivity.
The composite exhibits improved electron transfer kinetics and a more progressive response to NH3 compared to PANI.

Conclusions:

Ammonia sensing in PANI films depends on nanoscale morphology and charge transport, not just material content.
Nanotube-induced conductive pathways improve structural and electrochemical robustness.
The composite enables tunable, high-sensitivity, low-power ammonia sensing platforms.