Dataset Information

Textile-Based Potentiometric Electrochemical pH Sensor for Wearable Applications.

ABSTRACT: In this work, we present a potentiometric pH sensor on textile substrate for wearable applications. The sensitive (thick film graphite composite) and reference electrodes (Ag/AgCl) are printed on cellulose-polyester blend cloth. An excellent adhesion between printed electrodes allow the textile-based sensor to be washed with a reliable pH response. The developed textile-based pH sensor works on the basis of electrochemical reaction, as observed through the potentiometric, cyclic voltammetry (100 mV/s) and electrochemical impedance spectroscopic (10 mHz to 1 MHz) analysis. The electrochemical double layer formation and the ionic exchanges of the sensitive electrode-pH solution interaction are observed through the electrochemical impedance spectroscopic analysis. Potentiometric analysis reveals that the fabricated textile-based sensor exhibits a sensitivity (slope factor) of 4 mV/pH with a response time of 5 s in the pH range 6⁻9. The presented sensor shows stable response with a potential of 47 ± 2 mV for long time (2000 s) even after it was washed in tap water. These results indicate that the sensor can be used for wearable applications.

SUBMITTER: Manjakkal L

PROVIDER: S-EPMC6468877 | biostudies-literature | 2019 Jan

REPOSITORIES: biostudies-literature

ACCESS DATA

Publications

Textile-Based Potentiometric Electrochemical pH Sensor for Wearable Applications.

Manjakkal Libu L Dang Wenting W Yogeswaran Nivasan N Dahiya Ravinder R

Biosensors 20190116 1

In this work, we present a potentiometric pH sensor on textile substrate for wearable applications. The sensitive (thick film graphite composite) and reference electrodes (Ag/AgCl) are printed on cellulose-polyester blend cloth. An excellent adhesion between printed electrodes allow the textile-based sensor to be washed with a reliable pH response. The developed textile-based pH sensor works on the basis of electrochemical reaction, as observed through the potentiometric, cyclic voltammetry (100 ...[more]

PMID: 30654478

Similar Datasets

Project description:Textile-based wearable humidity sensors are of great interest for human healthcare monitoring as they can provide critical human-physiology information. The demand for wearable and sustainable sensing technology has significantly promoted the development of eco-friendly sensing solutions for potential real-world applications. Herein, a biodegradable cotton (textile)-based wearable humidity sensor has been developed using fabsil-treated cotton fabric coated with a poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) sensing layer. The structural, chemical composition, hygroscopicity, and morphological properties are examined using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), contact angle measurement, and scanning electron microscopy (SEM) analysis. The developed sensor exhibited a nearly linear response (Adj. R-square value observed as 0.95035) over a broad relative humidity (RH) range from 25 to 91.5%RH displaying high sensitivity (26.1%/%RH). The sensor shows excellent reproducibility (on replica sensors with a margin of error ±1.98%) and appreciable stability/aging with time (>4.5 months), high flexibility (studied at bending angles 30°, 70°, 120°, and 150°), substantial response/recovery durations (suitable for multiple applications), and highly repeatable (multicyclic analysis) sensing performance. The prospective relevance of the developed humidity sensor toward healthcare applications is demonstrated via breathing rate monitoring (via a sensor attached to a face mask), distinguishing different breathing patterns (normal, deep, and fast), skin moisture monitoring, and neonatal care (diaper wetting). The multinode wireless connectivity is demonstrated using a Raspberry Pi Pico-based system for demonstrating the potential applicability of the developed sensor as a real-time humidity monitoring system for the healthcare sector. Further, the biodegradability analysis of the used textile is evaluated using the soil burial degradation test. The work suggests the potential applicability of the developed flexible and eco-friendly humidity sensor in wearable healthcare devices and other humidity sensing applications.

Project description:The development of eco-friendly chemicals and material-based electrode systems with a reduced carbon footprint is a novel initiative for future technological applications. While electrochemical systems based on plant phytochemicals meet the requirements, comprehending the fundamental electron-transfer reactions and preparing stable surface-confined redox systems pose significant research challenges. In this study, we have demonstrated an in situ electrochemical reaction-assisted entrapment of redox-active betanin molecular species from native beetroot plants on a carbon black-modified glassy carbon surface (GCE/CB@Betn-Redox, where Betn-Redox stands for redox-active betanin molecular species) in a pH 2.2 KCl-HCl solution. In general, direct access to native plant phytochemicals is a formidable task due to the matrix effect. Isolating the desired phytochemicals necessitates a series of time-consuming chemical separation steps. Unlike previous literature reports on the unstable nature of Betn, GCE/CB@Betn-Redox exhibited a stable and well-defined proton-coupled electron-transfer peak at an apparent electrode potential, Eo' = 0.4 V vs Ag/AgCl, with a surface-excess value of 17.02 × 10-9 mol cm-2. Using several physicochemical techniques (transmission electron microscopy (TEM), Fourier-transform infrared (FTIR), and Raman), molecular techniques (UPLC), and electrochemical methods (in situ electrochemical quartz crystal microbalance (EQCM) and scanning electrochemical microscopy (SECM)), we have demonstrated the biomimicking electron-transfer functionality of CB@Betn-Redox. The unique feature of CB@Betn-Redox is its nonmediated effect on common biochemicals. This advantage makes it an interesting option for use as a selective pH sensor system without the complications of voltage drift that occur with the mediated oxidation/reduction functionality. We have successfully demonstrated highly selective and stable voltammetric and potentiometric pH sensor applications with practical real samples.

Dataset Information

Textile-Based Potentiometric Electrochemical pH Sensor for Wearable Applications.

Publications

Textile-Based Potentiometric Electrochemical pH Sensor for Wearable Applications.

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

Tweets