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Home > News > Copper Film Enables Accurate Optical Humidity Sensing

April 10th, 2007

Copper Film Enables Accurate Optical Humidity Sensing

The sensor material could be applied onto the package itself, according to Norman A. Lüchinger from the Institute for Chemical and Bioengineering at ETH. It is based on carbon-coated copper nanoparticles suspended in a polymer matrix to create a stable water dispersion. During preparation of copper dispersions, the researchers found, almost by accident, that they showed strong and vivid coloration patterns when in contact with humid air.


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