Reversible modulation of the redox activity in conducting polymer nanofilms induced by hydrophobic collapse of a surface-grafted polyelectrolyte

JOURNAL OF COLLOID AND INTERFACE SCIENCE

卷:518

Article

Fenoy, Gonzalo E.^1,2  Giussi, Juan M.¹  von Bilderling, Catalina^1,3  Maza, Eliana M.^1,4  Pietrasanta, Lia I.^3,5,6  Knoll, Wolfgang⁷  Marmisolle, Waldemar A.¹  Azzaroni, Omar¹ 

[1] UNLP, Fac Ciencias Exactas, Dept Quim, CONICET,Inst Invest Fis Quim Teor & Aplicadas INI, RA-1900 La Plata, Buenos Aires, Argentina

[2] Univ Nacl San Martin, Inst Invest & Ingn Ambiental, 25 Mayo y Francia,1 Piso, RA-1650 Buenos Aires, DF, Argentina

[3] Univ Buenos Aires, Fac Ciencias Exactas & Nat, Dept Fis, C1428EHA, Buenos Aires, DF, Argentina

[4] CIC BiomaGUNE, Soft Matter Nanotechnol Grp, Paseo Miramon 182, San Sebastian 20009, Gipuzkoa, Spain

[5] Univ Buenos Aires, Fac Ciencias Exactas & Nat, Inst Fis Buenos Aires, IFIBA,UBA CONICET, C1428EHA, Buenos Aires, DF, Argentina

[6] Univ Buenos Aires, Fac Ciencias Exactas & Nat, Ctr Microscopias Avanzadas, C1428EHA, Buenos Aires, DF, Argentina

[7] Austrian Inst Technol, Donau City Str 1, A-1220 Vienna, Austria

关键词: Polymer brushes;    Conducting polymers;    Polyaniline;    Nanoarchitectonics;    Anion responsiveness;   

DOI  :  10.1016/j.jcis.2018.02.014

来源: Elsevier

【 摘 要 】

We present the covalent modification of a Pani-like conducting polymer (polyaminobenzylamine, PABA) by grafting of a polyelectrolyte brush (poly [2-(methacryloyloxy)-ethyl-trimethylammonium chloride], PMETAC). As PABA has extra pendant amino moieties, the grafting procedure does not affect the back-bone nitrogen atoms that are implicated in the electronic structure of the conducting polymers. Moreover, perchlorate anions interact very strongly with the quaternary ammonium pendant groups of PMETAC through ion pairing. Therefore, the grafting does not only keep the electroactivity of PABA in aqueous solutions but it adds the ion-actuation properties of the PMETAC brush to the modified electrode as demonstrated by contact angle measurements and electrochemical methods. In this way, the conjugation of the electron transfer properties of the conducting polymer with the anion responsiveness of the integrated brush renders perchlorate actuation of the electrochemical response. These results constitute a rational integration of nanometer-sized polymer building blocks that yields synergism of functionalities and illustrate the potentialities of nanoarchitectonics for pushing the limits of soft material science into the nanoworld. (C) 2018 Elsevier Inc. All rights reserved.

【 授权许可】

Free