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Effect of plasma treatment on the sensor properties of a light‐addressable potentiometric sensor (LAPS)

  • A light-addressable potentiometric sensor (LAPS) is a field-effect-based (bio-) chemical sensor, in which a desired sensing area on the sensor surface can be defined by illumination. Light addressability can be used to visualize the concentration and spatial distribution of the target molecules, e.g., H+ ions. This unique feature has great potential for the label-free imaging of the metabolic activity of living organisms. The cultivation of those organisms needs specially tailored surface properties of the sensor. O2 plasma treatment is an attractive and promising tool for rapid surface engineering. However, the potential impacts of the technique are carefully investigated for the sensors that suffer from plasma-induced damage. Herein, a LAPS with a Ta2O5 pH-sensitive surface is successfully patterned by plasma treatment, and its effects are investigated by contact angle and scanning LAPS measurements. The plasma duration of 30 s (30 W) is found to be the threshold value, where excessive wettability begins. Furthermore, this treatment approach causes moderate plasma-induced damage, which can be reduced by thermal annealing (10 min at 300 °C). These findings provide a useful guideline to support future studies, where the LAPS surface is desired to be more hydrophilic by O2 plasma treatment.

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Metadaten
Author:Dua Özsoylu, Sefa Kizildag, Michael Josef SchöningORCiD, Torsten WagnerORCiD
DOI:https://doi.org/10.1002/pssa.201900259
ISSN:1862-6319
Parent Title (English):physica status solidi a : applications and materials sciences
Publisher:Wiley
Place of publication:Weinheim
Document Type:Article
Language:English
Year of Completion:2019
Date of the Publication (Server):2019/07/23
Volume:216
Issue:20
Length:8 Seiten
Note:
Corresponding author: Torsten Wagner
Link:https://doi.org/10.1002/pssa.201900259
Zugriffsart:weltweit
Institutes:FH Aachen / Fachbereich Medizintechnik und Technomathematik
FH Aachen / INB - Institut für Nano- und Biotechnologien
collections:Verlag / Wiley
Open Access / Hybrid
Licence (German):License LogoCreative Commons - Namensnennung-Nicht kommerziell