Fully Printed pH Sensor based on Polyaniline/Graphite Nanocomposites

Abstract

Recently, there has been exceptional growth in research related to the development of flexible sensors for health analysis. pH measurements can be done non-invasively and continuously, making such sensors an excellent choice for monitoring different stages of wound healing. Here, we report pH functionality of a polyaniline/graphite (PANI/G) composite in a fully-printed potentiometric pH sensor and the effect of graphite loading on sensor functionality. PANI/G composites in different ratios were aerosol-jet printed on Ag/AgCl with and without a graphite layer as the working electrode in a two-electrode potentiometric sensor on a flexible substrate. The role of the graphite layer on the working electrode in the functionality of the sensor has been investigated. The PANI/G composites were prepared by a solution processing method using a graphite paste and polyaniline emeraldine salt powder. Samples were characterized by X-ray diffraction, scanning electro microscopy, and Fourier transform infrared analysis to investigate the relations between the physical and chemical relations and the performance of the sensors. The sensors were tested in the pH range from 3 to 10, exhibiting a linear, stable and near-Nernstian sensitivity of 53 mV/pH and a response time of 15 s.

A flexible pH sensor based on polyaniline@oily polyurethane/polypropylene spunbonded nonwoven fabric

“…The selectivity coefficient of plasma can be obtained from the potential response in different cationic solutions with the same concentration (the concentration of the cationic solution is 0.01 M in this study). The ion selectivity coefficient ( K ) can be expressed as follows: 33,34 where I is the primary ion, J is the interfering ion, and POT is the potential. R is the gas constant, T is the temperature, and F is the Faraday constant.…”

“…The selectivity coefficient of plasma can be obtained from the potential response in different cationic solutions with the same concentration (the concentration of the cationic solution is 0.01 M in this study). The ion selectivity coefficient (K) can be expressed as follows: 33,34 log…”

Polyaniline Nano Films Synthesis in One Step via Chemical Oxidative Polymerization

“…The peaks at 2326 and 2358 cm -1 corresponds to C-N triple band. The peaks at 2875 and 2920 cm -1 corresponds to C-H stretching 32 .…”

Low-Cost Optical pH Sensor with a Polyaniline (PANI)-Sensitive Layer Based on Commercial Off-the-Shelf (COTS) Components

“…Among colorimetric methods, a remarkable place is taken by pH sensors that use a polyaniline (PANI) as the sensitive material to pH variation [11]. PANI is a well-studied conductive polymer [12] that presents a pH-dependent absorption coefficient in the visible light and partially in the near-infrared region (NIR) of the 0.4-1 µm range [13].…”