Comparative characterisation by atomic force microscopy and ellipsometry of soft and solid thin films

Mykhaylyk, T. A.; Dmitruk, N. L.; Evans, Stephen D.; Hamley, Ian W.; Henderson, J. R.

doi:10.1002/sia.2566

Cited by 22 publications

(30 citation statements)

References 49 publications

(65 reference statements)

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“…Another observation is that annealing exerted weak effect on film thickness. The tendencies found by ellipsometry and AFM correlated well in the case of CMCAB, corroborating with other reports in the literature for inorganic (Gesang et al 1995), enzymatic (Pancera et al 2006a, b) and polymeric (Mykhaylyk et al 2007) films. The ratio of angular coefficient obtained for acetone to that determined for ethyl acetate (Table 2) allowed estimating the experimental ratio D acetone /D EA as (1.4 ± 0.2), which evidenced that cellulose ester films prepared from acetone (D acetone ) solution were thicker (*40%) than those prepared from ethyl acetate (D EA ) solution.…”

Section: Resultssupporting

confidence: 92%

Characteristics of thin cellulose ester films spin-coated from acetone and ethyl acetate solutions

2008

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Spin-coated films of cellulose acetate (CA), cellulose acetate propionate (CAP), cellulose acetate butyrate (CAB) and carboxymethylcellulose acetate butyrate (CMCAB) have been characterized by ellipsometry, atomic force microscopy (AFM) and contact angle measurements. The films were spincoated onto silicon wafers, a polar surface. Mean thickness values were determined by means of ellipsometry and AFM as a function of polymer concentration in solutions prepared either in acetone or in ethyl acetate (EA), both are good solvents for the cellulose esters. The results were discussed in the light of solvent evaporation rate and interaction energy between substrate and solvent. The effects of annealing and type of cellulose ester on film thickness, film morphology, surface roughness and surface wettability were also investigated.

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Section: Resultssupporting

confidence: 92%

Characteristics of thin cellulose ester films spin-coated from acetone and ethyl acetate solutions

2008

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“…These values are compared very well with FFV % data obtained from the Bondi and van Krevlen method. It should be noted that the estimated values of FFV % are sensitive to the density of polymers . Thus, the reported FFV % values are higher for the PANI generated at temperature of 418 K as its density is lower (≈1.20 g cm −3 ) compared with the PANI obtained at 298 K (1.333 g cm −3 ).…”

Section: Resultsmentioning

confidence: 89%

Molecular dynamics simulation of surface morphology and thermodynamic properties of polyaniline nanostructured film

Bahramian

2014

Surf. Interface Anal.

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To develop predictive models in nanostructured films, there is an ongoing research to validate molecular dynamics (MD) simulation results with experimental data. The morphology and surface topography of polyaniline (PANI) nanostructured film coated on a TiO 2 nanocrystalline surface were investigated by scanning electron microscopy and atomic force microscopy, respectively. The atomistic model of the simulated PANI was generated using energy minimization with a condensed-phase optimized molecular potential for atomistic studies force field function to reach a thermodynamic equilibrium state. Various parameters of PANI such as density, energy, cavity size, and free volume distributions are calculated. MD simulation has also been used to obtain specific volume (V) as a function of temperature (T). It is demonstrated that this V-T curve can be used to determinate glass transition temperature T g , reliably. Although experimental data available for the PANI film are very limited, simulation results such as density and T g are in good agreement with the experimental values reported in the literature.Comparison of the surface topography of PANI demonstrates a reasonable trend between atomic force microscopy image analysis and the MD simulation results at various temperatures.

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“…Often, it was found that thin films had a very complicated structure, and the most appropriate way of simulating its dielectric functions was to treat the film as a mixture of two or more constituents 20. In conventional ellipsometry an effective medium approximation (EMA) was used to describe mixing of different media and to obtain quantitative information about the composition of a multicomponent film 21. In this surface structure, due to the intrusion of corrosion ions such as Cl − , H + , etc.…”

Section: Resultsmentioning

confidence: 99%

“…Spectroscopic ellipsometry (SE) is a nondestructive, sensitivity‐measuring tool, and does not require any sample preparation, which can sensitively monitor the gradual change of the surface films with sub‐nm‐order thickness and be used to obtain an accurate determination of surface film optical properties such as refractive index, extinction coefficient under/in ex situ conditions 12–14. By the ellipsometer, two parameters of ψ [arctan (relative amplitude ratio of p ‐ to s ‐polarized light)] and Δ (relative phase retardation between p ‐ and s ‐ polarized light), can simultaneously be sampled 15.…”

Section: Introductionmentioning

confidence: 99%

Ellipsometric analysis of corrosion behavior of 3C magnesium alloy surface touched by simulated sweat

Zhang

2011

Surface & Interface Analysis

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As an optimum shell material, AZ80 magnesium alloys are widely applied in the 3C (computers, communications and consumer electronics) industries. The case of 3C products corroded by a sweaty hand has been simulated and the corrosion characters have been investigated by ellipsometric technology. Thickness variation of corrosive medium film on a Mg alloy surface was monitored. Surface structure of a corrosion layer was described with a three-layer optical model (substrate -EMA -Cauchy) and thickness of each layer for different soaking time was obtained by fitting experimental data with the model. The corrosion product films with a refractive index of 1.45-1.62, loose corrosion product layer, can only provide limited protection to the substrate when a Mg alloy surface is corroded by sweat again.

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Comparative characterisation by atomic force microscopy and ellipsometry of soft and solid thin films

Cited by 22 publications

References 49 publications

Characteristics of thin cellulose ester films spin-coated from acetone and ethyl acetate solutions

Characteristics of thin cellulose ester films spin-coated from acetone and ethyl acetate solutions

Molecular dynamics simulation of surface morphology and thermodynamic properties of polyaniline nanostructured film

Ellipsometric analysis of corrosion behavior of 3C magnesium alloy surface touched by simulated sweat

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