IoT electrochemical sensor with integrated ▫$Ni(OH)_2–Ni$▫ nanowires for detecting formaldehyde in tap waterTrafela, Špela (Avtor) Krishnamurthy, Abhilash (Avtor) Žagar, Kristina (Avtor) Kavčič, Urška (Avtor) Karlovits, Igor (Avtor) Klopčič, Beno (Avtor) Šturm, Sašo (Avtor) Žužek Rožman, Kristina (Avtor) formaldehydeelectrochemical sensornickeltap waterSimple, low-cost methods for sensing volatile organic compounds that leave no trace and do not have a detrimental effect on the environment are able to protect communities from the impacts of contaminants in water supplies. This paper reports the development of a portable, autonomous, Internet of Things (IoT) electrochemical sensor for detecting formaldehyde in tap water. The sensor is assembled from electronics, i.e., a custom-designed sensor platform and developed HCHO detection system based on Ni(OH)2–Ni nanowires (NWs) and synthetic-paper-based, screen-printed electrodes (pSPEs). The sensor platform, consisting of the IoT technology, a Wi-Fi communication system, and a miniaturized potentiostat can be easily connected to the Ni(OH)2–Ni NWs and pSPEs via a three-terminal electrode. The custom-made sensor, which has a detection capability of 0.8 µM/24 ppb, was tested for an amperometric determination of the HCHO in deionized (DI) and tap-water-based alkaline electrolytes. This promising concept of an electrochemical IoT sensor that is easy to operate, rapid, and affordable (it is considerably cheaper than any lab-grade potentiostat) could lead to the straightforward detection of HCHO in tap water.MDPI20232023-06-06 08:23:16Neznano16615UDK: 681.5ISSN pri članku: 1424-8220DOI: 10.3390/s23104676COBISS_ID: 153733635Švicasl© 2023 by the authors