Integrated pH Sensors Based on RuO2/GO Nanocomposites Fabricated Using the Aerosol Jet Printing Method

作者：Mahtab Taheri, Mohsen Ketabi, A. A. Al Shboul, Shirin Mahinnezhad, Ricardo Izquierdo, M. Deen · 发表于：ACS Omega · 年份：2023 · DOI：10.1021/acsomega.3c06309 · 被引用次数：15 · 研究领域：Medicine

An aerosol jet printing (AJP) process for depositing ruthenium dioxide (RuO2) as a promising material for pH sensing is reported. Graphene oxide (GO) with a large surface area was used for the in situ sol–gel deposition of RuO2 nanoparticles on its surface. The cosolvent ratio and solid loading of the solution are adjusted to form a printable and stable ink. The monodispersed aerosol was atomized on the surface of the screen-printed carbon electrode in order to develop an integrated pH sensor. The RuO2–GO pH sensor demonstrates excellent performance, with a rapid response time of less than 5 s and high sensitivity in the pH range of 4–10. Compared to traditional carbon electrodes, the RuO2–GO sensor shows up to four times higher sensitivity. The increased sensitivity is a result of the consistent attachment of small-crystallized RuO2 nanoparticles onto the surface of GO sheets, leading to a synergistic effect. Thanks to the AJP method as a facile and cost-effective integration technique, the fabricated electrodes can serve as an alternative to traditional rigid pH electrodes for accurate pH measurement.