Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 28, Pages 33524-33535Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c08043
Keywords
pH sensor; polymeric ink; polyaniline; polypyrrole; inkjet printing
Funding
- Fundacion Centro de Estudios Interdisciplinarios Basicos y Aplicados (CEIBA)-Gobernacion de Bolivar (Colombia)
- Spanish government by Ministerio de Ciencia, Innovacion y Universidades (MINECO/FEDER, EU) [RTI2018-096786-B-I00, RTI2018-102070-B-C21]
- Generalitat de Catalunya [2017-SGR-988, 2017-SGR 1559]
- SU-8 Unit of the CIBER in Bioengineering, Biomaterials, and Nanomedicine (CIBER-BBN) at the IMB-CNM (CSIC) of ICTS NANBIOSIS
- MEINCOM
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The study introduces a fully printed pH sensor based on a specially formulated conducting polymer on a flexible substrate, showing good sensitivity and stability for healthcare biosensor applications.
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.
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