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Photoswitchable Macroscopic Solid Surfaces Based On Azobenzene‐Functionalized Polydopamine/Gold Nanoparticle Composite Materials: Formation, Isomerization and Ligand Exchange
Author(s) -
Kunfi Attila,
Bernadett Vlocskó Rita,
Keresztes Zsófia,
Mohai Miklós,
Bertóti Imre,
Ábrahám Ágnes,
Kiss Éva,
London Gábor
Publication year - 2020
Publication title -
chempluschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.801
H-Index - 61
ISSN - 2192-6506
DOI - 10.1002/cplu.201900674
Subject(s) - azobenzene , nanoparticle , isomerization , polymer , materials science , ligand (biochemistry) , surface modification , photoisomerization , colloidal gold , photochemistry , composite number , polymer chemistry , chemical engineering , chemistry , nanotechnology , organic chemistry , catalysis , composite material , biochemistry , receptor , engineering
The facile preparation of dynamic interfaces is presented based on the combination of photoisomerizable azobenzenes and polydopamine (PDA)/Au nanoparticle composite materials. Azobenzenes with different spacer lengths (C 3 , C 6 ) and surface‐binding groups (SH, NH 2 ) were synthesized. The polymer layer on macroscopic quartz surface was prepared by the facile aerobic autopolymerisation of dopamine hydrochloride under basic conditions. The presence of redox‐active catechol moieties meant that gold nanoparticles were formed on the polymer surface. The obtained UV‐Vis spectroscopic results confirmed that following their successful assembly, the switching of azobenzenes on PDA/Au was not affected by the surface binding group and the spacer length of the azobenzene molecules under the measurement conditions. Furthermore, facilitated by the curved nature of the Au particles, the surface‐bound azobenzene layer could be reconstructed by ligand‐exchange processes, and the photochemical characterization of the mixed layer was performed.