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. 2017 Jan 25;7:41368. doi: 10.1038/srep41368

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(A) Scheme of the protocol followed for Si₃N₄ sensor surface biofunctionalization. (B) XPS analysis of the binding energy for C1s bonds in untreated (left) and APTES-modified Si₃N₄ surfaces (right). (C) Fluorescent signals from the Cy3-Fas57 target for (i) untreated, (ii) PDITC-activated, (iii) complementary DNA-functionalized, and (iv) non-complementary DNA-functionalized sensor surfaces.