Science, Nanotech, Nanofabrication.
https://www.sciencedirect.com/topics/materials-science/nanosensors super cool article on applications and HOW it works https://www.azonano.com/article.aspx?ArticleID=4933 how it works https://www.nano.gov/sites/default/files/Nanosensor%20Fabrication%20NSF%20June%2013%202017%20final.ppt.pdf nano