[en] In this paper, we presented a novel, compact, conceptually simple, and fully functional low-cost prototype of a pH sensor with a PANI thin film as a sensing layer. The PANI deposition process is truly low-cost; it performs from the liquid phase, does not required any specialized equipment, and comprises few processing steps. The resulting PANI layer has excellent stability, resistance to solvents, and bio- and chemical compatibility. The pH sensor’s sensing part includes only a few components such as a red-light-emitting diode (LED) as a light source, and a corresponding photodiode (PD) as a detector. Unlike other PANI-based sensors, it requires no sophisticated and expensive techniques and components such lasers to excite the PANI or spectrometry to identify the PANI color change induced by pH variation. The pH sensor is sensitive in the broad pH range of 3 to 9, which is useful for numerous practical applications. The sensor requires a tiny volume of the test specimen, as little as 55 µL. We developed a fully integrated packaging solution for the pH sensor that comprises a limited number of components. The pH sensor comprises exclusively commercial off-the-shelf (COTS) components and standard printed circuit boards. The pH sensor is assembled using standard surface mounting technology (SMT).
Disciplines :
Electrical & electronics engineering
Author, co-author :
Stoukatch, Serguei ; Université de Liège - ULiège > Département d'électricité, électronique et informatique (Institut Montefiore) > Systèmes microélectroniques intégrés
Debliquy, Marc; Service de Science des Matériaux, Faculté Polytechnique, Université de Mons, 7000 Mons, Belgium
Dupont, François ; Université de Liège - ULiège > Département d'électricité, électronique et informatique (Institut Montefiore) > Systèmes microélectroniques intégrés
Redouté, Jean-Michel ; Université de Liège - ULiège > Département d'électricité, électronique et informatique (Institut Montefiore) > Systèmes microélectroniques intégrés
Language :
English
Title :
Low-Cost Optical pH Sensor with a Polyaniline (PANI)-Sensitive Layer Based on Commercial Off-the-Shelf (COTS) Components
his work was supported by the Microsystème_ULg Microsys (No. 1510608), and Microstystème_UMONS projects, funded by the Wallonia (Belgium), and the Micro+ project (No. 675781-642409) co-funded by the European Regional Development Fund (ERDF) and Wallonia (Belgium).
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