Tuning of the electrochemical properties of transparent fluorine-doped tin oxide electrodes by microwave pulsed-plasma polymerized allylamine
Anna Cirocka , Dorota Zarzeczańska , Anna Wcisło , Jacek Ryl , Robert Bogdanowicz , Birgit Finke , Tadeusz Ossowski
AbstractWe report here the dry, one-step, and low-temperature modification of FTO surfaces using pulsed plasma polymerization of allylamine (PPAAm). PPAAm/FTO surfaces were characterized by X-ray photoelectron spectroscopy, spectroscopic ellipsometry, and contact angles to understand the morphological, structural, and optical properties. FTO were coated with a very thin layer of adherent cross-linked, pinhole-, and additive-free allylamine plasma polymer resistant to hydrolysis and delamination, and characterized by a high density of positively charged amino groups. Electrochemical studies revealed that PPAAm/FTO electrodes show wide range pH stability and reaction rates tuned by the duration of plasma treatment. We show how the modification of plasma treatment duration between 72 s and 288 s affects the chemical structure and thickness of the obtained modification, having a strong influence on the charge transfer kinetics. In particular, XPS revealed the occurrence of the reduction processes under long-term plasma exposure proving the need for monitoring of this key factor. This covalent immobilization of amine compounds on FTO surface using rapid process in microwave pulsed-plasma makes it a promising electrode for future applications in electrochemical biosensors and optoelectronic devices.
|Journal series||Electrochimica Acta, ISSN 0013-4686, (A 40 pkt)|
|Publication size in sheets||0.5|
|Keywords in English||Fluorine-doped tin oxide electrodes, surface modification, plasma polymerization, allylamine, direct surface amination|
|Score||= 40.0, 24-07-2019, ArticleFromJournal|
|Publication indicators||: 2017 = 1.101; : 2017 = 5.116 (2) - 2017=4.857 (5)|
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