Layered double hydroxides for ultrathin hybrid film preparation using layer-by-layer and spin coating methods

Tamás Aradi, V. Hornok, I. Dékány

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24 Citations (Scopus)

Abstract

In our work, the synthesis and the structural properties of various layered double hydroxides (LDHs) were investigated. LDHs were prepared from metal salts with sodium hydroxide in aqueous medium at various molar ratios. Nitrate salts of, Mg2+, Ca2+, Co2+, Al3+ and acetate salt of Zn2+ were applied as precursors. The concentrations of LDH suspensions were in the range of 0.1-1 g/100 ml. The particle size and zeta-potential of LDH particles were measured by dynamic light scattering (DLS). The structure properties of LDHs were analyzed by several methods, namely XRD, UV-vis spectroscopy and AFM. We used the layer-by-layer dipping immersion technique and the spin coating method for the preparation of multilayer films from LDHs on glass surfaces. The cleaned glass surface has a negative surface charge, which is compensated by the positively charged LDH particles. Different negatively charged binders poly(sodium 4-styrenesulfonate), (PSS); poly(acryl-acid), (PAA) were utilized for the preparation of layer-by-layer films. Layer thickness was calculated from absorbance measurements by spectrophotometry and mass determination of the glass surface. Typical film thicknesses were in the range of 19-70 nm/layer and 6-40 μg/cm2/layer depending on the type of LDH and preparation technique. After n = 20 immersion cycles, maximal layer thickness was 1405 nm for 20 layers of 2:1 ZnAl-LDH/PSS film. The film preparation methods tested were compared and it was established that the films obtained by the layer-by-layer method are more stable but thicker than those prepared using the spin coating method.

Original languageEnglish
Pages (from-to)116-121
Number of pages6
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume319
Issue number1-3
DOIs
Publication statusPublished - Apr 15 2008

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Hydroxides
Film preparation
Spin coating
hydroxides
coating
Salts
Glass
preparation
Sodium
Multilayer films
Spectrophotometry
Dynamic light scattering
Zeta potential
Surface charge
Ultraviolet spectroscopy
Binders
Film thickness
Structural properties
Nitrates
Particle size

Keywords

  • Hybrid films
  • Layer-by-layer method
  • Layered double hydroxides
  • Spin coating method
  • Ultrathin films

ASJC Scopus subject areas

  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry

Cite this

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title = "Layered double hydroxides for ultrathin hybrid film preparation using layer-by-layer and spin coating methods",
abstract = "In our work, the synthesis and the structural properties of various layered double hydroxides (LDHs) were investigated. LDHs were prepared from metal salts with sodium hydroxide in aqueous medium at various molar ratios. Nitrate salts of, Mg2+, Ca2+, Co2+, Al3+ and acetate salt of Zn2+ were applied as precursors. The concentrations of LDH suspensions were in the range of 0.1-1 g/100 ml. The particle size and zeta-potential of LDH particles were measured by dynamic light scattering (DLS). The structure properties of LDHs were analyzed by several methods, namely XRD, UV-vis spectroscopy and AFM. We used the layer-by-layer dipping immersion technique and the spin coating method for the preparation of multilayer films from LDHs on glass surfaces. The cleaned glass surface has a negative surface charge, which is compensated by the positively charged LDH particles. Different negatively charged binders poly(sodium 4-styrenesulfonate), (PSS); poly(acryl-acid), (PAA) were utilized for the preparation of layer-by-layer films. Layer thickness was calculated from absorbance measurements by spectrophotometry and mass determination of the glass surface. Typical film thicknesses were in the range of 19-70 nm/layer and 6-40 μg/cm2/layer depending on the type of LDH and preparation technique. After n = 20 immersion cycles, maximal layer thickness was 1405 nm for 20 layers of 2:1 ZnAl-LDH/PSS film. The film preparation methods tested were compared and it was established that the films obtained by the layer-by-layer method are more stable but thicker than those prepared using the spin coating method.",
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T1 - Layered double hydroxides for ultrathin hybrid film preparation using layer-by-layer and spin coating methods

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AU - Hornok, V.

AU - Dékány, I.

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N2 - In our work, the synthesis and the structural properties of various layered double hydroxides (LDHs) were investigated. LDHs were prepared from metal salts with sodium hydroxide in aqueous medium at various molar ratios. Nitrate salts of, Mg2+, Ca2+, Co2+, Al3+ and acetate salt of Zn2+ were applied as precursors. The concentrations of LDH suspensions were in the range of 0.1-1 g/100 ml. The particle size and zeta-potential of LDH particles were measured by dynamic light scattering (DLS). The structure properties of LDHs were analyzed by several methods, namely XRD, UV-vis spectroscopy and AFM. We used the layer-by-layer dipping immersion technique and the spin coating method for the preparation of multilayer films from LDHs on glass surfaces. The cleaned glass surface has a negative surface charge, which is compensated by the positively charged LDH particles. Different negatively charged binders poly(sodium 4-styrenesulfonate), (PSS); poly(acryl-acid), (PAA) were utilized for the preparation of layer-by-layer films. Layer thickness was calculated from absorbance measurements by spectrophotometry and mass determination of the glass surface. Typical film thicknesses were in the range of 19-70 nm/layer and 6-40 μg/cm2/layer depending on the type of LDH and preparation technique. After n = 20 immersion cycles, maximal layer thickness was 1405 nm for 20 layers of 2:1 ZnAl-LDH/PSS film. The film preparation methods tested were compared and it was established that the films obtained by the layer-by-layer method are more stable but thicker than those prepared using the spin coating method.

AB - In our work, the synthesis and the structural properties of various layered double hydroxides (LDHs) were investigated. LDHs were prepared from metal salts with sodium hydroxide in aqueous medium at various molar ratios. Nitrate salts of, Mg2+, Ca2+, Co2+, Al3+ and acetate salt of Zn2+ were applied as precursors. The concentrations of LDH suspensions were in the range of 0.1-1 g/100 ml. The particle size and zeta-potential of LDH particles were measured by dynamic light scattering (DLS). The structure properties of LDHs were analyzed by several methods, namely XRD, UV-vis spectroscopy and AFM. We used the layer-by-layer dipping immersion technique and the spin coating method for the preparation of multilayer films from LDHs on glass surfaces. The cleaned glass surface has a negative surface charge, which is compensated by the positively charged LDH particles. Different negatively charged binders poly(sodium 4-styrenesulfonate), (PSS); poly(acryl-acid), (PAA) were utilized for the preparation of layer-by-layer films. Layer thickness was calculated from absorbance measurements by spectrophotometry and mass determination of the glass surface. Typical film thicknesses were in the range of 19-70 nm/layer and 6-40 μg/cm2/layer depending on the type of LDH and preparation technique. After n = 20 immersion cycles, maximal layer thickness was 1405 nm for 20 layers of 2:1 ZnAl-LDH/PSS film. The film preparation methods tested were compared and it was established that the films obtained by the layer-by-layer method are more stable but thicker than those prepared using the spin coating method.

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