Gemma Gabriel

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Oleg Yu Vorobyev

Siberian Federal University

Bob Myhill

University of Bristol

Ille C. Gebeshuber

Tu Wien

Scott Fitzpatrick

University of Oregon

Simon Redfern

Nanyang Technological University

Asmaa Boujibar

Western Washington University

Mohamed Refai

Cairo University

Moses Teye

University of Cape Coast

Cornelya Klütsch

Trent University

Suhad S Mahmood

University of Baghdad

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Specially Designed Polyaniline/Polypyrrole Ink for a Fully Printed Highly Sensitive pH Microsensor

ACS Applied Materials & Interfaces

pH sensing for healthcare applications requires sensors with mechanically stable materials of hig... more pH sensing for healthcare applications requires sensors with mechanically stable materials of high sensitivity and high reproducibility combined with low-cost fabrication technologies. This work proposes a fully printed pH sensor based on a specially formulated conducting polymer deposited on a microelectrode in a flexible substrate. A formulation, which combined polyaniline (PANI) and polypyrrole (PPy) with integrated polyelectrolyte poly(sodium 4-styrenesulfonate) (PSS), was specially prepared to be printed by inkjet printing (IJP). The sensor has good sensitivity in the physiological region (pH 7–7.5) key for the healthcare biosensor. This mixture printed over a commercial gold ink, which has a singular chemical functionalization with phthalocyanine (Pc), increased the sensor sensitivity, showing an excellent reproducibility with a linear super-Nernstian response (81.2 ± 0.5 mV/pH unit) in a wide pH range (pH 3–10). This new ink together with the IJP low-cost technique opens new opportunities for pH sensing in the healthcare field with a single device, which is disposable, highly sensitive, and stable in the whole pH range.

Specially Designed Polyaniline/Polypyrrole Ink for a Fully Printed Highly Sensitive pH Microsensor

ACS Applied Materials & Interfaces

A novel MEMS-based sensor for simultaneous pH and dissolved oxygen profiling in biofilms

ABRACT Microsensors have become a powerful tool in the development of biofiltration techniques fo... more ABRACT Microsensors have become a powerful tool in the development of biofiltration techniques for gaseous pollutants abatement, from the information obtained in situ within biofilms. Concentration profiles recorded using microsensors allow the determination of mass transport and biokinetics parameters. Different microsensors, based on microelectromechanical systems (MEMS) have been developed recently, to overcome most of the conventional Clark-type microsensors limitations. Taking into account that dissolved oxygen and pH are critical parameter in biofilm reactors, a new microsensor has been developed by including a second array of microelectrodes added in parallel to a previously developed dissolved oxygen (DO) sensor. Microelectrodes used for pH sensing are platinum based electrodes modified using electrodeposited iridium oxide technology. Results from this work show the complete characterization and validation of the multi electrode as a powerful tool for simultaneous pH and DO profiling of biofilms in different types of fixed bed bioreactors.

Gemma Gabriel

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