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Updated: Oct 29, 2025

A Polyaniline-based Sensor of Nucleic Acids

A Polyaniline-based Sensor of Nucleic Acids

Published on: November 1, 2016

Specially Designed Polyaniline/Polypyrrole Ink for a Fully Printed Highly Sensitive pH Microsensor.

Miguel Zea^1,2, Robert Texidó³, Rosa Villa^1,4

¹Instituto de Microelectrónica de Barcelona IMB-CNM (CSIC), Campus Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Barcelona, Spain.

ACS Applied Materials & Interfaces

|July 6, 2021

Summary

A new, fully printed pH sensor uses a special conducting polymer blend for highly sensitive and reproducible healthcare applications. This low-cost, disposable device offers stable pH sensing across a wide range.

Keywords:

inkjet printing pH sensor polyaniline polymeric ink polypyrrole

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Last Updated: Oct 29, 2025

A Polyaniline-based Sensor of Nucleic Acids

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Published on: November 1, 2016

Manufacturing of a Nafion-coated, Reduced Graphene Oxide/Polyaniline Chemiresistive Sensor to Monitor pH in Real-time During Microbial Fermentation

Manufacturing of a Nafion-coated, Reduced Graphene Oxide/Polyaniline Chemiresistive Sensor to Monitor pH in Real-time During Microbial Fermentation

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Hybrid Printing for the Fabrication of Smart Sensors

Hybrid Printing for the Fabrication of Smart Sensors

Published on: January 31, 2019

Area of Science:

Materials Science
Electrochemistry
Biomedical Engineering

Background:

Healthcare applications demand mechanically stable, sensitive, and reproducible pH sensors fabricated using low-cost methods.
Existing pH sensing technologies often face limitations in terms of cost, stability, or sensitivity in physiological ranges.

Purpose of the Study:

To develop a fully printed pH sensor utilizing a novel conducting polymer formulation for enhanced healthcare applications.
To investigate the performance characteristics, including sensitivity, reproducibility, and stability, of the developed printed pH sensor.

Main Methods:

Formulation of a conducting polymer blend comprising polyaniline (PANI) and polypyrrole (PPy) with poly(sodium 4-styrenesulfonate) (PSS).
Inkjet printing (IJP) of the polymer formulation onto a microelectrode on a flexible substrate, over a gold ink functionalized with phthalocyanine (Pc).
Characterization of sensor performance, including sensitivity and reproducibility across a wide pH range (pH 3-10).

Main Results:

The printed pH sensor demonstrated good sensitivity in the physiological pH range (7-7.5).
The sensor exhibited excellent reproducibility and a linear super-Nernstian response (81.2 ± 0.5 mV/pH unit) from pH 3 to 10.
The combination of the PANI/PPy/PSS ink and Pc-functionalized gold ink significantly enhanced sensor sensitivity.

Conclusions:

The developed inkjet-printed conducting polymer pH sensor offers a low-cost, disposable, highly sensitive, and stable solution for healthcare applications.
This technology opens new opportunities for advanced pH monitoring in the healthcare sector.
The sensor's performance, particularly its stability and sensitivity across a broad pH range, makes it suitable for various biomedical uses.