Low-Cost Flexible Glass-Based pH Sensor via Cold Atmospheric Plasma Deposition
Autor: | Venkat Kasi, Sotoudeh Sedaghat, Alejandro M Alcaraz, Murali Kannan Maruthamuthu, Ulisses Heredia-Rivera, Sina Nejati, Juliane Nguyen, Rahim Rahimi |
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Rok vydání: | 2022 |
Předmět: | |
Zdroj: | ACS Applied Materials & Interfaces. 14:9697-9710 |
ISSN: | 1944-8252 1944-8244 |
DOI: | 10.1021/acsami.1c19805 |
Popis: | Many commercially available pH sensors are fabricated with a glass membrane as the sensing component because of several advantages of glass-based electrodes such as versatility, high accuracy, and excellent stability in various conditions. However, because of their bulkiness and poor mechanical properties, conventional glass-based sensors are not ideal for wearable or flexible applications. Here, we report for the first time the fabrication of a flexible glass-based pH sensor suitable for biomedical and environmental applications where flexibility and stability of the sensor are critical for long-term and real-time monitoring. The sensor was fabricated via a simple and facile approach using the cold atmospheric plasma technique in which a pH sensitive silica coating was deposited from a siloxane precursor onto a carbon electrode. In order to increase the sensitivity and stability of the sensor, we employed a postprocessing step which involves annealing of the silica coated electrode at elevated temperatures. This process was optimized to ensure that the crucial properties such as porosity and hydration functionality were balanced to obtain the best and most reliable sensitivity of the sensor. Our sensitivity test results indicated that these sensors exhibit excellent and stable sensitivity with a slope of about 48 mV/pH ( |
Databáze: | OpenAIRE |
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