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Left panel: transmission electron microscope (TEM) image of unmodified pSiNPs; the inset shows a closer view of a single nanoparticle. Right panel: in situ synthesized PNA (left); physically adsorbed PNA (right). Adapted with permission from [187,188,189]: Bertucci et al. © 2019 American Chemical Society; Beavers et al. © 2014 American Chemical Society; Beavers et al. © 2016 WILEY-VCH Verlag GmbH and Co., KGaA, Weinheim.
