Category: Morphological and structural studies of wo x thin films deposited by

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morphological and structural studies of wo x thin films deposited by

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Thank you for submitting a report!Thickness of thin films is usually observed to have significant influence on various properties of chromogenic materials.

XRD analysis revealed the amorphous nature of deposited thin films of different thicknesses. FTIR spectrum showed the characteristic vibrations of intermolecular bonds in molybdenum oxide. The transmission spectra revealed the slight increase in average transmittance in the visible-NIR region with increase in thickness of thin films.

The optical band gap of the deposited thin films of different thicknesses was found to be increasing with increase in thickness of the films which may be attributed to decreased defect centres.

The decrease in the values of Urbach energy with increase in thickness may be due to the increased homogeneity and decrease in scattering centres. Transition metal oxides are known as chromogenic materials, owing to their ability to change their optical absorption properties on light irradiation photo-chromicheat absorption thermo-chromic and application of external electric field electro-chromic [ 12 ].

These materials constitute an interesting group of semiconducting materials because of their technological applications in various fields such as smart windows and display devices [ 2 ], solid state micro-batteries [ 34 ], electrochromic devices [ 1 ] and gas sensor [ 5 ]. It can be used as a cathode material in the development of solid state microbatteries [ 4 ] and as a catalyst in a variety of partial oxidation reactions [ 11 ].

For the device applications, deposition of thin films of suitable thickness and optimization of their properties is required. Various deposition techniques have been employed to deposit molybdenum oxide thin films that include chemical vapor deposition [ 16 ], vacuum thermal evaporation [ 17 ], sol-gel coating [ 18 ], sputtering [ 1920 ], electro-deposition [ 21 ], flash evaporation [ 22 ] and spray pyrolysis technique [ 23 ].

Among these, vacuum evaporation is a widely used, reliable and highly efficient technique for depositing thin films of molybdenum oxide. This technique has very low chances of film contamination and does not damage the substrate.

The oxygen vacancies present in the films can trap electrons and result in the formation of color centers [ 6 ]. These substoichiometric films find applications in photochromic, thermochromic and electrochromic devices [ 2627 ]. Limited literature has been reported on the effect of thickness on various properties of thermally evaporated molybdenum oxide thin films as compared to other deposition techniques for depositing molybdenum oxide thin films.

The effect of thickness has been investigated and reported in this research work for the optimization of different properties of molybdenum oxide thin films.

Thin films of molybdenum oxide were deposited on glass substrates using thermal evaporation technique [ 282930 ]. The optical transmission of the films was recorded in the wavelength range — nm using UV—visible-NIR spectrophotometer Varian Cary The presence of broad hump and absence of sharp peaks in the XRD patterns of as-deposited films confirms the amorphous nature. Touihri et al. The FTIR spectra of thin film of thickness nm showed the vibration bands at The bands at Chibane et al.

For the thin film of thickness nm, the FTIR spectrum showed the bands at The band observed at FTIR spectrum of thin film of thickness nm showed absorption bands at It is clear from this figure that the morphology of film having thickness nm was composed of irregular shaped nanoflakes like sturctures of different sizes that were randomly distributed.

Film of thickness nm was also composed of irregular nanoflakes that were more densely stacked. With further increase in thickness of film nmthe nanoflakes transformed to grains of irregular shapes.

Morphological properties of airbrush spray-deposited enzymatic cellulose thin films

It is also confirmed from these images that the uniformity of films improves with increase in thickness. Field emission scanning electron microscopic images of the surface morphology of molybdenum oxide thin films of different thicknesses. A slight increase in transmission with the increase in thickness of the films was observed which may be attributed to the increased homogeneity of thin films and decreased scattering centres.

The appearance of fringes in transmission spectra is due to the optical interference effect and also confirm the uniformity of films [ 3334 ]. Hence the optical band gap was 3.In the current research we have studied the structural, morphological, optical and ultraviolet UV light sensing properties of ZnO thin film. The film was prepared by sol-gel technique and deposited on glass substrate by spin coating method. The structural analysis was performed by X-ray diffractometer XRD while the surface morphology and optical properties of the deposited thin film were monitored using field emission scanning electron microscope and UV-VIS spectrophotometer.

The calculated value for optical band-gap was 3. Refractive indices and dielectric constants were calculated by utilizing the bandgap value by considering different relations. Request Permissions. Xu, X. Li, Y. Chen, F. Xu, Structural and optical properties of ZnO thin films prepared by sol—gel method with different thickness, Appl. Humayun, M. Kashif and U. Dias Tavares Jr, M. Muller, J. Fabris, C. Massone, Excitation characteristics of a wire-preionized, ultraviolet nitrogen laser, Opt.

Kong, H. Cho, M. Kim, R. Choi, B.

Thickness dependent structural, morphological and optical properties of molybdenum oxide thin films

Hashim, ZnO thin film deposition on butterfly shaped electrodes for ultraviolet sensing applications, Optik-International Journal for Light and Electron Optics, Torres-Huerta, M. Dominguez-Crespo, S. Brachetti-Sibaja, J. Arenas-Alatorre, A. Rodrguez-Pulido, Effect of the substrate on the properties of ZnO—MgO thin films grown by atmospheric pressure metal-organic chemical vapor deposition, Thin Solid Films.

Chakraborty, T. Mondal, S. Bera, S. Sen, R. Ghosh, G. Paul, Effects of aluminum and indium incorporation on the structural and optical properties of ZnO thin films synthesized by spray pyrolysis technique, Mater. DOI: Kane, C. Ndao, E. Gueye, M. Gaye, N. Ndiaye, I. Ngom, B. Ngom, P. Tall, A. Kane 1C.

Ndao 1E. Gueye 1M. Gaye 1N.

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Ndiaye 1I. Ngom 1B. Tall 1A. Beye 1. The films were grown onto different glass substrate at a repetition rate of 10Hz, pulse energy of mJ and irradiation time of 20 min.

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The structural and optical properties of the films are found to be strongly dependent on the nature of the substrate. The room temperature photoluminescence PL spectrum shows a dominant near-band-edge emission peak for the film deposited on borosilicate and GGG substrate. The absorption coefficient exhibits a direct bandgap feature with some band tailing effects.

morphological and structural studies of wo x thin films deposited by

Keywords: laser ablation, nucleation, band gap, ZnO nanomaterial, glass substrate. Transparent Conducting Oxide TCO films have found extensive applications in optoelectronic devices for example, solar cell, liquid crystal displays, heat mirrors and multiplayer photo thermal conversion system. Zinc Oxide has attracted attention as a transparent conducting oxide because of its large band gap, high conductivity, ease in doping, chemical stability in hydrogen plasma, thermal stability when doped with IIA group elements, abundance in nature and nontoxicity.

In addition to potential use as transparent conducting oxide in optoelectronic devices, ZnO thin films also find application as gas sensors, because of their high electrical resistivity [ 12 ]. For applications in the ultraviolet spectral range, besides GaN based materials, ZnO and its alloys have become the focus of attention in the last years, due to the possibility of using excitonic effects at room temperature.XRD results revealed that the FTO thin films were polycrystalline with a tetragonal rutile-type structure and had preferential orientations along planes.

The calculated grain mean sizes were nm. The optical gap of FTO thin films was in a 3. The high-conducting and transparent-elaborating FTO thin films may have several promising applications due to its multifunctional properties. Request Permissions. Chopra, S. Major, D. Pandya, Transparent conductors—A status review, Thin solid films, 1 Shanthi, C. Subramanian, P. Ramasamy, Investigations on the optical properties of undoped, fluorine doped and antimony doped tin oxide films, Crystal Research and Technology, 34 8 DOI: Banyamin, P.

Kelly, G. West, J. Boardman, Electrical and optical properties of fluorine doped tin oxide thin films prepared by magnetron sputtering, Coatings, 4 4 Kim, R.

Auyeung, A. Najafi, S. Shi, K. Xu, Properties of fluorine-doped tin oxide films prepared by an improved sol-gel process, Materials Science in Semiconductor Processing, 58 Hanif, A. Sasha, W. Lau, F. Mohamad, W. Zaki, W. Trans Tech Publications.

Flores-Carrasco, S. Gomez-Villalba, M. Rabanal, O. Malik, F. Amador, Fluorine-doped tin oxide films with a high figure of merit fabricated by spray pyrolysis, J.We investigate the layer formation of enzymatic cellulose by airbrush spray coating on silicon oxide surfaces.

For each spray coating step, layer buildup, surface topography, crystallinity as well as the nanoscale structure are probed with atomic force microscopy and surface-sensitive X-ray scattering methods. Without intermittent drying, the film thickness saturates; with intermittent drying, a linear increase in layer thickness with the number of spray pulses is observed.

A closed cellulose layer was always observed. The crystallinity remains unchanged; the nanoscale structures show three distinct sizes. Our results indicate that the smallest building blocks increasingly contribute to the morphology inside the cellulose network for thicker films, showing the importance of tailoring the cellulose nanofibrils.

For a layer-by-layer coating, intermittent drying is mandatory. Cellulose-based films are excellent templates and coatings for bio-based applications due to their renewable and resource-saving characteristics. Methods of coating cellulose include spin-coating, dip-coating and spraying. In addition to plant-based cellulose, there exist nonplant sources, e. This paper is structured as follows.

First, the methods and procedures for data analysis used, namely surface-sensitive X-ray scattering and atomic force microscopy, as well as the procedures for analysis of grazing incidence data, are presented.

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The next section describes in detail the sample preparation, i. Afterward, the results from the topographical studies, the crystallinity, and the nanoscale structure and morphology are discussed. The paper concludes with a summary.

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X-ray diffraction and scattering are chosen to investigate the structure and morphology of cellulose thin films and fibers. Additionally, the sample can be translated in y -direction and z -direction. The wavevector transfer is defined using the following equation. C denotes the cellulose sample. The scattered wavevector is denoted as k f. IDG denotes the intermodule gap of the two-dimensional Pilatus detector. H denotes the sample horizon.

morphological and structural studies of wo x thin films deposited by

The incident wave is scattered at electron density differences in the thin film. In our case, this specular reflected beam is shadowed by a lead beamstop in order to avoid saturation of the detector. The diffusely scattered intensity is detected outside this area above the sample horizon H.

The scattered intensity is determined by reflection and refraction effects and the roughness of the film. The scattered intensity consists of a convolution of structure factors and form factors of the structures present inside the thin film.

The form factor is related to the electron density distribution of the thin film via:. This interference maximum is called Yoneda peak 41 and can be calculated as a maximum in the Fresnel transmission coefficients. A scratch was done at the center of samples, and three AFM images for each sample were recorded at the scratch position.Subscribe to our Newsletter and get informed about new publication regulary and special discounts for subscribers!

Full Text PDF. This work is licensed under a Creative Commons Attribution 4. Chamberlin and J. Sabnis, Prakash A. Bhadane and P. June 23, Fujii, A. Tomozawa, H. Torii, and R. Takayama, Preferred orientations of NiO films prepared by plasma-enhanced metalorganic chemical vapor deposition, Japanese Journal of Applied Physics, Vol.

L—L, Potapov and D. Benedek, L. Reining, M. Gatti, Exchange and Correlation effects in the electronic properties of transition metal oxides: the example of NiOAnno Accademico, Guziewicza, W. Junga, J. Grochowskia, M. Borysiewicza, K Golaszewskaa, R. Kruszkaa, A. Baranskaa, A. Piotrowskaa, B. Witkowskib, J. Domagalaa; b,M. Gryzinskic, K. Tyminskac and A. Stonertd, aInstitute of Electron Technology, al.

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Reguig, A. Khelil, L. Cattin, M. Morsli, J. Bayansal, H.

Thickness dependent structural, morphological and optical properties of molybdenum oxide thin films

Kahraman, H. De Los Santos ValladaresD. Hurtado SalinasA. Bustamante DominguezD. Acosta Najarro S. KhondakerT.

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