Formaldehyde Sensor with Pentagram-Shaped Core-Shell Nanostructure as Catalyst

Rapid, disposable, low-cost and simple-to-use formaldehyde (FA) sensor is favorable for on-site food safety detection. Herein, a batch-printed chip based FA electrochemical sensor is developed with bimetallic Ag-Pt nanoparticles as highly active catalyst. The prepared nanoparticles exhibit a regular Ag@Pt core-shell nanostructure with pentagram shape. Combined with reduced graphene oxide (rGO) to improve conductivity, the disposable sensor can determine FA in the range of 1 to 100 µM with a LOD of 1 µM. This sensor also shows high selectivity and reproducibility and is able to detect FA in real food samples.