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Rapid and In Situ Synthesis of Gold Nanoparticles in Redox Multilayer Film for Biosensor Applications
Author(s) -
Sun Yixin,
Ren Kefeng,
Liu Xiangsheng,
Ji Jian
Publication year - 2019
Publication title -
chemnanomat
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.947
H-Index - 32
ISSN - 2199-692X
DOI - 10.1002/cnma.201900477
Subject(s) - materials science , nanoparticle , chemical engineering , redox , layer by layer , cyclic voltammetry , electrochemistry , fabrication , hydrogen peroxide , acrylic acid , biosensor , layer (electronics) , ferrocene , colloidal gold , nanotechnology , thin film , electrode , chemistry , polymer , copolymer , organic chemistry , composite material , metallurgy , medicine , alternative medicine , pathology , engineering
Ferrocene‐grafted poly(ethyleneimine)/poly(acrylic acid) (PEI‐Fc/PAA) multilayer films were constructed via layer‐by‐layer assembly. When the PEI‐Fc/PAA films were immersed in HAuCl 4 solution, Fc and the Au III were converted to Fc + and Au 0 , respectively, via the redox reaction of Fc and HAuCl 4 , and the PEI‐Fc/PAA@Au nanoparticles (NPs) multilayer films were rapidly fabricated. SEM and TEM results showed Au NPs were distributed homogeneously throughout the thickness of the whole film. The electron transfer behavior of PEI‐Fc/PAA@Au NPs multilayer films was investigated by cyclic voltammetry and AC impedance. The results indicated that the Au NPs greatly improve the conductivity of multilayer films and thus enhance the electrochemical properties of films. The PEI‐Fc/PAA@Au NPs films were further used for the fabrication of a hydrogen peroxide (H 2 O 2 ) sensor, which showed good catalytic ability for the reduction of H 2 O 2 . This approach is expected to expand the routes towards rapid fabrication of Au NPs into multilayer films.