Next Article in Journal
Measuring Vapor and Liquid Concentrations for Binary and Ternary Systems in a Microbubble Distillation Unit via Gas Sensors
Previous Article in Journal
Application of Fecal Volatile Organic Compound Analysis in Clinical Practice: Current State and Future Perspectives
Previous Article in Special Issue
Synthesis, Curing Behavior and Swell Tests of pH-Responsive Coatings from Acryl-Terminated Oligo(β-Amino Esters)
Article Menu

Export Article

Open AccessArticle
Chemosensors 2018, 6(3), 30; https://doi.org/10.3390/chemosensors6030030

Broad-Range Hydrogel-Based pH Sensor with Capacitive Readout Manufactured on a Flexible Substrate

1
Department of Electronics, Mid Sweden University, Holmgatan 10, 851 70 Sundsvall, Sweden
2
RISE Acreo AB, Bredgatan 33, 601 17 Norrköping, Sweden
*
Author to whom correspondence should be addressed.
Received: 17 June 2018 / Revised: 17 July 2018 / Accepted: 23 July 2018 / Published: 25 July 2018
(This article belongs to the Special Issue Thin Film Based Sensors)
Full-Text   |   PDF [1930 KB, uploaded 25 July 2018]   |  

Abstract

Environmental monitoring of land, water and air, is an area receiving greater attention because of human health and safety concerns. Monitoring the type of pollution and concentration levels is vital, so that appropriate contingency plans can be determined. To effectively monitor the environment, there is a need for new sensors and sensor systems that suits these type of measurements. However, the diversity of sensors suitable for low, battery powered- and large area sensor systems are limited. We have manufactured and characterized a flexible pH sensor using laser processing and blade coating techniques that is able to measure pH between 2.94 and 11.80. The sensor consists of an interdigital capacitance with a pH sensitive hydrogel coating. Thin sensors can reach 95% of their final value value within 3 min, and are stable after 4 min. Good repeatability was achieved in regard to cycling of the sensor with different pH and multiple measurements from dry state. We have also studied the relation between an interdigital capacitance penetration depth and hydrogels expansion. We believe that our passive sensor is suitable to be used in low power and large area sensor networks. View Full-Text
Keywords: interdigital; hydrogel; penetration depth; pH; sensor; coating; thin film; laser ablation; oligo (β-amino esters) interdigital; hydrogel; penetration depth; pH; sensor; coating; thin film; laser ablation; oligo (β-amino esters)
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Hammarling, K.; Engholm, M.; Andersson, H.; Sandberg, M.; Nilsson, H.-E. Broad-Range Hydrogel-Based pH Sensor with Capacitive Readout Manufactured on a Flexible Substrate. Chemosensors 2018, 6, 30.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Chemosensors EISSN 2227-9040 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top