Journal
ANALYST
Volume 138, Issue 18, Pages 5208-5215Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3an00710c
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Funding
- European Union [PCIG09-GA-2011-293538]
- Fundacion Recercaixa
- Ministry of Science and Innovation (MICINN) of Spain [CTQ2010-18717]
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A simple and generalized approach to build electrochemical sensors for wearable devices is presented. Commercial cotton yarns are first turned into electrical conductors through a simple dyeing process using a carbon nanotube ink. These conductive yarns are then partially coated with a suitable polymeric membrane to build ion-selective electrodes. Potentiometric measurements using these yarn-potentiometric sensors are demonstrated. Examples of yarns that can sense pH, K+ and NH4+ are presented. In all cases, these sensing yarns show limits of detection and linear ranges that are similar to those obtained with lab-made solid-state ion-selective electrodes. Through the immobilization of these sensors in a band-aid, it is shown that this approach could be easily implemented in a wearable device. Factors affecting the performance of the sensors and future potential applications are discussed.
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