A parylene-protected nitrate selective microsensor on a carbon fiber cross section
| Autor: | Tatyana A. Bendikov, Scott Miserendino, Yu-Chong Tai, Thomas C. Harmon |
|---|---|
| Rok vydání: | 2007 |
| Předmět: |
Materials science
Scanning electron microscope Doping Metals and Alloys Analytical chemistry engineering.material Condensed Matter Physics Polypyrrole Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry.chemical_compound Parylene chemistry Coating Materials Chemistry engineering Fiber Electrical and Electronic Engineering Xylylene Instrumentation Layer (electronics) |
| Zdroj: | Sensors and Actuators B: Chemical. 123:127-134 |
| ISSN: | 0925-4005 |
| DOI: | 10.1016/j.snb.2006.08.007 |
| Popis: | This work describes a novel design for a potentiometric microsensor for nitrate (NO 3 − ) ion based on doped polypyrrole (PPy(NO 3 − )) films. First, 6–7 μm diameter single carbon fiber filaments are coated with a thin (1–10 μm) insulating layer of parylene C (poly( o -chloro- p -xylylene)). This preparatory step is followed by electrodeposition of a PPy(NO 3 − ) sensing layer on the open carbon fiber cross section. Parylene C provides an excellent protective coating for the fiber while maintaining its flexibility at micro-dimensions. Examination by scanning electron microscopy confirms that the sensing material (PPy(NO 3 − )) is deposited in the form of micro-beads with diameter of 30–40 μm at the fiber tip. The resulting nitrate sensor exhibits an improvement of approximately half an order of magnitude of NO 3 − concentration in sensitivity and linear response range relative to a previously reported PPy(NO 3 − )-based sensor for which the sensing layer was deposited on the carbon fiber walls. The overall sensor geometry, a micro-dimensioned sensing portion accompanied by a flexible, parylene-insulated body, forms a sensor for nitrate with a unique form factor that can be widely used for in situ measurements of variety of environmental samples. |
| Databáze: | OpenAIRE |
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