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Layer-by-layer self-assembly preparation of layered double hydroxide/polyelectrolyte nanofilms monitored by surface plasmon resonance spectroscopy |
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| Authors: | M.?Szekeres,A.?Széchenyi,K.?Stépán,T.?Haraszti,I.?Dékány author-information" > author-information__contact u-icon-before" > mailto:i.dekany@chem.u-szeged.hu" title=" i.dekany@chem.u-szeged.hu" itemprop=" email" data-track=" click" data-track-action=" Email author" data-track-label=" " >Email author |
| Affiliation: | (1) Department of Colloid Chemistry, University of Szeged, Aradi vt. 1, 6720 Szeged, Hungary;(2) Nanostructured Materials Research Group of The Hungarian Academy of Sciences, Aradi vt. 1, 6720 Szeged, Hungary |
| Abstract: | Layer-by-layer self-assembly was used to prepare nanofilms of (2:1) MgAl-layered double hydroxide (LDH) nanoparticles and polyacrylic acid or sodium polystyrene sulfonate. The multilayers were attached to ~50-nm thick gold films on microscopy glass slides prepared by vacuum evaporation. The contact between the gold film and the multilayered films was mediated via surface modification with thiols, adsorption of poly(diallyl dimethyl ammonium) chloride (PDDA) or direct binding of the LDH particles. Surface plasmon resonance (SPR) spectra of the multilayered films were analyzed by fitting the Fresnel equations. The shifts in the SPR angle (  SPR) due to the adsorption/deposition on the gold surface were used to evaluate the process of building up the multilayers. Strong surface/multilayer contact formed when electrostatic attraction and hydrophobic interaction were combined as in the case of mercaptopropanoic acid or PDDA sticking layers. The LDH suspension concentration strongly influenced the number of deposited layers. The multilayer films were investigated by reflection FT-IR spectroscopy. |
| Keywords: | Layered double hydroxide Layer-by-layer self-assembly Surface plasmon resonance spectroscopy Polyelectrolytes Nanofilms |
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