Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 186, Issue -, Pages 293-299Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2013.06.017
Keywords
Pyrolyzed photoresist films; PPF; Disk electrodes; Passivation; Glassy carbon electrodes; Mercury detection
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This work describes a method to passivate pyrolized photoresist films (PPF) to microfabricate electrodes suitable for electrochemical applications. The work describes the passivation process in detail, which entails pre-treating the PPF structures with mild ammonia plasma followed by silanization with SiH4 to promote the adhesion of the passivation layer. The working condition of these electrodes is demonstrated by the detection of mercury in aqueous solutions (pH = 1.5) down to 2 ppb. We discuss possible ways to improve the passivation of PPF that will lead to more complex structures and devices made in this material. The dynamic range of the method described here is already analytically useful, but we suggest ways to shorten the time of analysis and push the detection limit below 1 ppb using PPF electrodes. (C) 2013 Elsevier B.V. All rights reserved.
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