Detecting non-uniformities in 2D materials may lead to new medical sensors

(Foreground) Doxorubicin molecule, detected using the van der Waals vertical heterostructure biosensor. (Background) Actual nanoscale optical image (sSNOM) of the heterostructure: large triangle is a single-layer MoS2 island (ca. 3.7 micron wide); smaller triangle is a partially oxidized MoOS island; whole sample is covered…

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