![]() ![]() ![]() "We have done the testing to 1 part per million and lower concentrations, which could be 10 times better than conventional design," says Huanyu Larry Cheng, assistant professor of engineering science and mechanics and materials science and engineering. When the salt was removed by dissolving in water, the researchers determined that the smallest salt crystals enabled the most sensitive sensor. They tried this with a variety of different salt sizes and tested the sensitivity on conventional interdigitated electrodes, as well as the newly developed laser-induced graphene platform. When the researchers added molybdenum disulfide and reduced graphene oxide precursors to the canister, the nanocomposites formed structures in the small spaces between the salt crystals. Nitrogen dioxide is a noxious gas emitted by vehicles that can irritate the lungs at low concentrations and lead to disease and death at high concentrations. To change the morphology, they packed a container with very finely ground salt crystals. The researchers were interested in seeing how different morphologies of the gas-sensitive nanocomposites affect the sensitivity of the material to detecting nitrogen dioxide molecules at very low concentration. The sensor combines a newly developed laser-induced graphene foam material with a unique form of molybdenum disulfide and reduced-graphene oxide nanocomposites. Researchers at Penn State, Northeastern University and five universities in China have developed and tested a stretchable, wearable gas sensor for environmental sensing. ![]()
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March 2023
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