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https://hdl.handle.net/11147/11826
Title: | Electroactive nanogel formation by reactive layer-by-layer assembly of polyester and branched polyethylenimine via aza-Michael addition | Authors: | Yıldırımkaraman, Öykü Özenler, Sezer Günay, Ufuk Saim Durmaz, Hakan Yıldız, Ümit Hakan |
Keywords: | Nanostructured materials Polyethylenimines |
Publisher: | American Chemical Society | Abstract: | We here demonstrate the utilization of reactive layer-by-layer (rLBL) assembly to form a nanogel coating made of branched polyethylenimine (BPEI) and alkyne containing polyester (PE) on a gold surface. The rLBL is generated by the rapid aza-Michael addition reaction of the alkyne group of PE and the -NH2 groups of BPEI by yielding a homogeneous gel coating on the gold substrate. The thickness profile of the nanogel revealed that a 400 nm thick coating is formed by six multilayers of rLBL, and it exhibits 50 nm roughness over 8 mu m distance. The LBL characteristics were determined via depth profiling analysis by X-ray photoelectron spectroscopy, and it has been shown that a 70-100 nm periodic increase in gel thickness is a consequence of consecutive cycles of rLBL. A detailed XPS analysis was performed to determine the yield of the rLBL reaction: the average yield was deduced as 86.4% by the ratio of the binding energies at 286.26 eV, (C CN-C bond) and 283.33 eV, (C C triple bond). The electrochemical characterization of the nanogels ascertains that up to the six-multilayered rLBL of BPEI-PE is electroactive, and the nanogel permeability had led to drive mass and charge transfer effectively. These results promise that nanogel formation by rLBL films may be a straightforward modification of electrodes approach, and it exhibits potential for the application of soft biointerfaces. | URI: | https://doi.org/10.1021/acs.langmuir.1c01070 https://hdl.handle.net/11147/11826 |
ISSN: | 0743-7463 |
Appears in Collections: | Chemistry / Kimya PubMed İndeksli Yayınlar Koleksiyonu / PubMed Indexed Publications Collection Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection |
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acs.langmuir.1c01070.pdf | 6.76 MB | Adobe PDF | View/Open |
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