High performance flexible pH sensor based on polyaniline nanopillar array electrode.

Area of Science:

• Materials Science
• Sensor Technology
• Electrochemistry

Background:

• Flexible pH sensors are crucial for wearable health monitoring and chemical process analysis.
• Existing technologies often face challenges with durability and performance under mechanical stress.

Purpose of the Study:

• To fabricate and characterize novel flexible pH sensors.
• To evaluate sensor performance, particularly its stability and response under bent conditions.

Main Methods:

• Utilized soft lithography with a polymeric blend to create a flexible nanopillar backbone.
• Employed electrochemical deposition to coat the nanopillar array with polyaniline (PAN).
• Configured a two-electrode system with a PAN working electrode and an Ag/AgCl reference electrode.

Main Results:

• Achieved a near-Nernstian response of approximately 60.3mV/pH.
• Demonstrated that the sensor's performance remained consistent in a bent state.
• Exhibited excellent response time, reversibility, repeatability, selectivity, and long-term stability.

Conclusions:

• The developed flexible polyaniline nanopillar pH sensors show great promise for wearable applications.
• The fabrication method yields robust sensors capable of maintaining high performance under mechanical strain.
• These sensors represent a significant advancement in flexible electronic devices for continuous monitoring.