Prussian Blue/Carbon Nanotube Sensor Spread with Gelatin/Zein Glaze: A User-Friendly Modification for Stable Interference-Free Hsub2/subOsub2/sub Amperometry

A DIY sensor for hydrogen peroxide

31 July 2022

A simple, inexpensive method for creating hydrogen-peroxide sensors in the lab has been developed and demonstrated.

Hydrogen-peroxide sensors are needed in various applications, including biomedical and industrial ones. Sensors that use the dye Persian blue are simple and portable, but their performance tends to decline during storage, making it difficult to stockpile them.

Now, three researchers from Vidyasirimedhi Institute of Science and Technology (VISTEC) in Thailand have demonstrated a straightforward way to make hydrogen-peroxide sensors based on Prussian blue in the lab.

The trio’s method uses only low-priced materials and doesn’t require expertise in chemical synthesis. It involves coating a screen-printed carbon screen with three layers — a layer of Prussian blue and carbon nanotubes; one with zein (a protein from corn); and a gelatin top layer. The zein and gelatin layers protect against leakage of Prussian blue.

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References

1. Analytical Chemistry 94, 4919−4923 (2022). doi: 10.1021/acs.analchem.1c05202