Electroactive Nanogel Formation by Reactive Layer-by-Layer Assembly of Polyester and Branched Polyethylenimine via Aza-Michael Addition

Yildirimkaraman O, Özenler S, Gunay US, Durmaz H, Ylldlz ÜH (2021)

Publication Type: Journal article

Publication year: 2021

Journal

Langmuir American Chemical Society

DOI: 10.1021/acs.langmuir.1c01070

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 μm 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, (CC 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.

Authors with CRIS profile

Sezer Özenler Professur für Molekulare Nanostrukturen

Involved external institutions

Izmir Institute of Technology (IZTECH) TR Turkey (TR) Istanbul Technical University / İstanbul Teknik Üniversitesi (İTÜ) TR Turkey (TR)

How to cite

APA:

Yildirimkaraman, O., Özenler, S., Gunay, U.S., Durmaz, H., & Ylldlz, Ü.H. (2021). Electroactive Nanogel Formation by Reactive Layer-by-Layer Assembly of Polyester and Branched Polyethylenimine via Aza-Michael Addition. Langmuir. https://dx.doi.org/10.1021/acs.langmuir.1c01070

MLA:

Yildirimkaraman, Oyku, et al. "Electroactive Nanogel Formation by Reactive Layer-by-Layer Assembly of Polyester and Branched Polyethylenimine via Aza-Michael Addition." Langmuir (2021).

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