Abstract
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.
Highlights
PH is a key indicator for many biochemical processes and for this reason, pH sensors have received considerable attention for monitoring human healthcare due to their versatility, possibility of real-time measurements, and quantitative results.[1]
To obtain the Conducting polymers (CPs) inks for inkjet printing (IJP), water-dispersible particles of PANI and PPy were synthesized through the electrostatic interaction suspension method as described in the Experimental Section
The mean value combined with particle size distribution (PDI) values around 0.2 obtained for each suspension fulfilled the requirements of IJP to avoid the clogging of the printer nozzle
Summary
Downloaded via 52.90.136.113 on November 8, 2021 at 11:39:12 (UTC). See https://pubs.acs.org/sharingguidelines for options on how to legitimately share published articles. 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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