The analysis and study of materials science and technological factors in the creation of film converters are carried out, the requirements for materials, their properties, and the technology of forming the converter elements are determined. It is shown that taking into account material science and technological factors ensures that the parameters of the film transducer match the required ones, resistance to external infiuencing factors, obtaining films of the initial composition, and stability of the production technology. The choice of material parameters is made taking into account the operating modes and conditions, static and dynamic loads acting on the elements of the converter, the properties of the starting materials and film elements. When joining dissimilar materials, the coefficients of linear expansion are taken into account. In the process of creating film converters, the initial materials, structural elements are processed in various technological environments and, are subjected to thermal effects, the specified structures and parameters of the film converter are formed, and at the same time, the imperfections in the initial materials and converter elements are amplified, which directly or indirectly affect the output parameters of the film converter. In the manufacture of film elements of the transducer, the choice of the method for producing thin films is determined by the purpose of the film, the compatibility of the method with other technological operations of microelectronic technology. The reproducibility of the electrophysical properties of thin films takes place during their deposition with a controlled composition, which is essential for the production of films based on semiconductor compounds and for the formation of the sensitive elements of the transducer. The analysis and study of methods for obtaining films showed that the energy efficiency of the process of ion sputtering of materials and the production of thin films of a given composition, technological fiexibility, the ability to control the thickness of the films by changing the current value, the deposition time and the pressure at which it is carried out are the most optimal.
Adsorption and interaction of carbon monoxide (CO) and nitric oxide (NO) molecules on the surface of bare Al-Mo(110) system and on that obtained by its in situ oxidation have been studied in ultra-high vacuum (base pressure: ca. 10−8 Pa) by means of Auger and X-ray photoelectron spectroscopy (AES, XPS), low energy electron diffraction (LEED), reflection–absorption infrared and thermal desorption spectroscopy (RAIRS, TDS), and by the work function measurements. In order to achieve the Al-Mo(110) alloy the thin aluminum film of a few monolayers thick was in situ deposited onto the Mo(110) crystal and then annealed at 800 K. As a result of Al atoms diffusion into the Mo(110) subsurface region and the chemical reaction, the surface alloy of a hexagonal atomic symmetry corresponding to Al2Mo alloy is formed. The feature of thus formed surface alloy regarding molecular adsorption is that, unlike the bare Mo(110) and Al(111) substrates, on which both CO and NO dissociate, adsorption on the alloy surface is non-dissociative. Moreover, adsorption of carbon monoxide dramatically changes the state of pre-adsorbed NO molecules, displacing them to higher-coordinated adsorption sites and simultaneously tilting their molecular axis closer to the surface plane. After annealing of this coadsorbed system up to 320 K the (CO + NO → CO2 + N) reaction takes place resulting in carbon dioxide desorption into the gas phase and nitriding of the substrate. Such an enhancement of catalytic activity of Mo(110) upon alloying with Al is attributed to surface reconstruction resulting in appearance of new adsorption/reaction centers at the Al/Mo interface (steric effect), as well as to the Mo d-band filling upon alloying (electronic effect). Catalytic activity mounts further when the Al-Mo(110) is in situ oxidized. The obtained Al-Mo(110)-O ternary system is a prototype of a metal/oxide model catalysts featuring the metal oxides and the metal/oxide perimeter interfaces as a the most active reaction sites. As such, this type of low-cost metal alloy oxide models precious metal containing catalysts and can be viewed as a potential substitute to them.
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