In this abstract, we will present an inkjet printed flexible amperometric hydrogen sulfide sensor tag facilitating the direct measurement of hydrogen sulfide level in a solution. Technology features of the as-developed sensor include 1. A working electrode made of printed silver particles (Ag NPs) on a soft substrate can exhibit excellent sensitivity and reliability via the electrochemically modified surface by the printed reduced graphite oxide and Nafion/hexamine ruthenium nanocomposite, 2. Monolithically integrated with an inkjet silver/silver chloride reference electrode for the realization of miniaturized sensors. In this study, the anti-interference ability reliability, feasibility of continuous monitoring, and stability of the printed sensing and reference electrode have been fully investigated. Experimental results show that the printed silver electrode can exhibit a sensitivity of 59.71nA/μM/cm<sup>2</sup> and 0.26 μM of the limit of detection (LoD) and the sensing electrode can effectively block interference resulting from ascorbic acid, urea acid, dopamine, etc... A measurement of the hydrogen sulfide released by the thermal oxidation of sulfur-containing amino acids from heated eggs has demonstrated the feasibility of real-time measurement of the sensing electrode. We think the sensor with the characteristics of a simple manufacturing process with low cost, high controllability, and repeatability on a flexible substrate can provide not only more extensively sensing applications but also better size scaling ability for sensor miniaturization.

Flexible inkjet printed hydrogen sulfide sensing electrodes

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ACS Fall 2022

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