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. 2015 Jun 17;10(6):e0129577. doi: 10.1371/journal.pone.0129577

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© 2015 Garvas et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Fig 1 — Firstly, 3-(2-aminoethylamino)propyltrimethoxysilane (AEAPMS) is attached to free–OH groups of the nanotubes’ surface (fTiO₂-NT). Secondly, the Alexa 488 SDP ester is covalently linked to the free amino groups of silane molecules (A-TiO₂-NT).