Citation, please, like I do.
It was actually a really cool story when this happened during the pandemic. The original inventor of the current n95 mask production technique came out of retirement to help out.
Too bad that the whitepaper's test sensors only works on particles greater than 300nm.
But it does rejuvenate the mask for another working day and alleviate N95 mask shortages.
But does not measure for virus-sized water-based particles.
Second link also has zero “actionable” citation and scarily so, has a paltry 84 citations-by. Making this actionless, “citation-free” paper an even terrible source.
Sole reference: https://www.pnas.org/syndication/doi/10.1073/pnas.2110117118