The relevance of pH assessment in clinical analysis, environmental and industrial control, has raised the demand for the development of portable, low cost and easy-to-use monitoring systems. This paper proposes a pH sensor printed on a paper support passivated with a solid-ink coating. The sensor exploits the pH sensitivity of a reduced graphene oxide functionalized with 3-(4-aminophenil)propionic acid. The sensor responded in the pH range [4, 10] and had a sensitivity of 46 mV/pH. Tests on human plasma and seawater proved this pH sensor to have similar performances than those of a commercial pH-meter with an uncertainty of 0.1 and 0.2 pH unit in plasma and seawater, respectively.
A graphene-based pH sensor on paper for human plasma and seawater / Vivaldi F.; Bonini A.; Melai B.; Poma N.; Kirchhain A.; Santalucia D.; Salvo P.; Di Francesco F.. - 2019:(2019), pp. 1563-1566. ( 41st Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC 2019 Berlin (Germany) 2019) [10.1109/EMBC.2019.8856991].
A graphene-based pH sensor on paper for human plasma and seawater
Bonini A.;
2019
Abstract
The relevance of pH assessment in clinical analysis, environmental and industrial control, has raised the demand for the development of portable, low cost and easy-to-use monitoring systems. This paper proposes a pH sensor printed on a paper support passivated with a solid-ink coating. The sensor exploits the pH sensitivity of a reduced graphene oxide functionalized with 3-(4-aminophenil)propionic acid. The sensor responded in the pH range [4, 10] and had a sensitivity of 46 mV/pH. Tests on human plasma and seawater proved this pH sensor to have similar performances than those of a commercial pH-meter with an uncertainty of 0.1 and 0.2 pH unit in plasma and seawater, respectively.
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