Thermal stability of pyrolytic tin oxide films on aluminium

Roos, Arne; Chinyama, G. K.; Hedenqvist, Per

doi:10.1016/0040-6090(93)90639-7

Cited by 9 publications

(2 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Using this model, theoretical parameters such as the volume ratio and distribution range of alumina particles were determined, their dependencies on the anodization conditions were evaluated, and the optical constants of the alumina films were calculated. Roos et al [320] determined the optical properties of tin oxide coated Al and anodized Al according to the BM. McPhedran and Nicorovici [321] applied the Rayleigh method to derive a formulation yielding the MG effective dielectric tensor of a periodic composite of an array of elliptical cylinders placed in a matrix with a dielectric constant of unity.…”

Section: Composite Porous and Discontinuous Filmsmentioning

confidence: 99%

Interpretation of IR Spectra of Ultrathin Films

2003

Handbook of Infrared Spectroscopy of Ultrathin Films

View full text Add to dashboard Cite

Generally speaking, IR spectral measurements of ultrathin films are undertaken to determine (i) the chemical identity of adsorbed species (including dissociation fragments); (ii) the geometric or structural arrangement (orientation) of these species and their positions with respect to the surface atoms of the substrate; (iii) their vibrational, rotational, and translational motion on the surface; (iv) the charge distribution and energy level structure of the valence electrons in both adsorbate and substrate; and (v) the effects of external perturbations, such as the electric and magnetic fields, photons, electrons, heating, and surface pressure on factors (i)-(iv) [1]. However, such information cannot be extracted directly from the IR spectra of ultrathin films due to the strong dependence of the shape and relative intensity of the bands on the geometry of the experiment, the optical properties of the substrate, the surroundings, the gradient of the optical properties at the film-substrate interface and in the film itself, as well as on the film thickness, and the particle size in the case of powder or islandlike supports. These effects and their physical background are discussed in Sections 3.1-3.5 and 3.9. In addition, there can be an intensity transfer between modes of coadsorbed species and a change in the band position with surface coverage. This effect is used for determining the mode of the surface filling and the degree of intermixing of different species at the surface (Section 3.6). If the film under study is located at the electrode-solution interface, the resulting spectrum is made up of contributions of all species in the path of radiation that are affected by the electrode potential, which further complicates the interpretation. Apart from technical means (Chapter 4), there exist analytical and mathematical approaches to resolve contributions of different species in such a complex spectrum (Sections 3.7 and 3.8). Another feature of the IR spectra of ultrathin films that is perhaps surprising and unexpected is their sensitivity to the volume fraction, shape, and orientation of inhomogeneities (e.g., pores or inclusions) in the film. Moreover, if the characteristic size of the 140

show abstract

Section: Composite Porous and Discontinuous Filmsmentioning

confidence: 99%

Interpretation of IR Spectra of Ultrathin Films

2003

Handbook of Infrared Spectroscopy of Ultrathin Films

View full text Add to dashboard Cite

show abstract

“…The anodizing process for aluminium and its alloys has been adopted widely in industry. Using this technique, anodic films of aluminium are obtained which have the merits of high hardness, wearability and excellent corrosion resistance [1,2]. Another advantage of this film is that it can be firmly bound to the aluminium substrate.…”

Section: Introductionmentioning

confidence: 99%

A study on the surface and interface of porous anodic oxide film of aluminium

Xu¹,

Qi²,

Zhao³

et al. 1996

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

The structure of the surface of porous anodic film formed in oxalic acid electrolyte and the interface between the anodic film and the aluminium substrate have been investigated by AES, XPS, TEM and HREM. The results show that the interface between the anodic film and the aluminium substrate is expanded owing to the interdiffusion of oxygen ions and metal ions. A transition layer, which consists of oxygen and aluminium ions, exists between the anodic film and the aluminium substrate. The presence of this transition layer is probably the main reason for the increase in adhesion between the anodic film and the aluminium substrate.

show abstract