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AuthorLorencova, Lenka
AuthorGajdosova, Veronika
AuthorHroncekova, Stefania
AuthorBertok, Tomas
AuthorJerigova, Monika
AuthorVelic, Dusan
AuthorSobolciak, Patrik
AuthorKrupa, Igor
AuthorKasak, Peter
AuthorTkac, Jan
Available date2023-06-26T04:54:19Z
Publication Date2020
Publication NameFrontiers in Chemistry
ResourceScopus
URIhttp://dx.doi.org/10.3389/fchem.2020.00553
URIhttp://hdl.handle.net/10576/44817
AbstractFor efficient and effective utilization of MXene such as biosensing or advanced applications, interfacial modification of MXene needs to be considered. To this end, we describe modification of Ti3C2Tx MXene by aryldiazonium-based grafting with derivatives bearing a sulfo- (SB) or carboxy- (CB) betaine pendant moiety. Since MXene contains free electrons, betaine derivatives could be grafted to MXene spontaneously. Kinetics of spontaneous grafting of SB and CB toward MXene was electrochemically examined in two different ways, and such experiments confirmed much quicker spontaneous SB grafting compared to spontaneous CB grafting. Moreover, a wide range of electrochemical methods investigating non-Faradaic and Faradaic redox behavior also in the presence of two redox probes together with contact-angle measurements and secondary ion mass spectrometry (SIMS) confirmed substantial differences in formation and interfacial presentation of betaine layers, when spontaneously grafted on MXene. Besides spontaneous grafting of CB and SB toward MXene, also electrochemical grafting by a redox trigger was performed. Results suggest that electrochemical grafting provides a denser layer of SB and CB on the MXene interface compared to spontaneous grafting of SB and CB. Moreover, an electrochemically grafted SB layer offers much lower interfacial resistance and an electrochemically active surface area compared to an electrochemically grafted CB layer. Thus, by adjusting the SB/CB ratio in the solution during electrochemical grafting, it is possible to effectively tune the redox behavior of an MXene-modified interface. Finally, electrochemically grafted CB and SB layers on MXene were evaluated against non-specific protein binding and compared to the anti-fouling behavior of an unmodified MXene interface.
SponsorThe authors would like to acknowledge the financial support received from the Slovak Research and Development Agency APVV 17-0300. We would like to acknowledge the support received from the Ministry of Health of the Slovak Republic under the project registration numbers 2018/23-SAV-1 and 2019/68-CHÚSAV-1. This publication was supported by Qatar University Grants IRCC-2020-004. The finding achieved herein is solely the responsibility of the authors.
Languageen
PublisherFrontiers Media S.A.
Subjectcarboxybetaine
EIS
electrochemistry
sulfobetaine
Ti3C2Tx MXene
zwitterions
TitleElectrochemical Investigation of Interfacial Properties of Ti3C2Tx MXene Modified by Aryldiazonium Betaine Derivatives
TypeArticle
Volume Number8
dc.accessType Open Access


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