Four-channel NFC system for electrochemical sensing of fluids

Electrochemical analysis systems are increasingly important for applications like Point-of-Care diagnostics and Lab-on-Package sensing. Herein, we propose a system composed of four passive NFC (Near Field Communication) microchips capable of performing open circuit potentiometry through interactions with commercial smartphones. The multi-chip NFC system can be used to quantify four chemical quantities within a unique liquid sample thanks to a microfluidic circuit which feeds four ad-hoc screen-printed electrodes. In this contribution, preliminary calibration on four analytes is reported. The four target quantities considered in this paper are sodium, potassium, calcium, and pH. The sensing matrix will be human blood and fluids derived from food spoilage Thanks to further implementation with microfluidic channels currently under development, the NFC chemical analyses can facilitate domestic monitoring of patients and rapid, on-site test of pieces of food to check food quality and prevent foodborne illnesses.