Morphological and structural characterization of CrO2/Cr2O3 films grown by Laser-CVD

Sousa, Paulo; Silvestre, A. J.; Popovici, N.; Conde, O.

doi:10.1016/j.apsusc.2005.01.061

Cited by 63 publications

(26 citation statements)

References 24 publications

(32 reference statements)

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“…The Raman spectrum of the as-deposited composite coating mainly reflects the spectrum of IF-WS 2 nanoparticles. The weak peak at 550 cm − 1 , corresponding to the presence of Cr 2 O 3 , confirms that the as-deposited Cr 2 O 3 matrix is amorphous or poorly crystallized [28]. In the heat-treated coating, the peak intensity related to IF-WS 2 nanoparticles decreases, while peaks centred at 549 cm − 1 and 614 cm − 1 become stronger, which correspond to the A 1g mode and E g mode of Cr 2 O 3 , respectively [29][30][31].…”

Section: Thermal Behaviour Of Precursorssupporting

confidence: 58%

Synthesis of Cr2O3-based nanocomposite coatings with incorporation of inorganic fullerene-like nanoparticles

Hou

Choy

2008

Thin Solid Films

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Section: Thermal Behaviour Of Precursorssupporting

confidence: 58%

Synthesis of Cr2O3-based nanocomposite coatings with incorporation of inorganic fullerene-like nanoparticles

Hou

Choy

2008

Thin Solid Films

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“…The same reason hinders the identification of possible Cr 2 O 3 peaks that should appear at 1450 and 1490 cm -1 [19] as well as C-C bonds at 1640 cm -1 [20]. [24] and Cr-O bond detected by XPS (see above). The existence of carbon D and G bands corroborates the XPS results (C1s peak analysis), although it is difficult to estimate the fraction of free carbon and carbides in the films.…”

Section: Chemical Compositionmentioning

confidence: 99%

Complex frictional analysis of self-lubricant W-S-C/Cr coating

et al. 2012

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Transition metal dichalcogenides belong to one of the most developed class of materials for solid lubrication. However, one of the main drawbacks of most of the self-lubricating coatings is their low load-bearing capacity, particularly in terrestrial atmospheres. In our previous works, alloying thin films based on tungsten disulfide with non-metallic interstitial elements, such as carbon or nitrogen, has been studied in order to improve tribological performance in different environments.Excellent results were reached with the deposited coatings hardness, in some cases, more than one order of magnitude higher than single W-S films. 2In this work, W-S-C films were deposited with increasing Cr contents by co-sputtering chromium and composite WS 2 -C and targets. Two films were prepared with approx. 7 and 13 at.% of Cr.Alloying with chromium led to dense films with amorphous microstructure; the hardness and adhesion was improved. Sliding tests were carried out in dry and humid air using pin-on-disc with 100Cr6 steel ball as a counterpart. To analyse the sliding process, the surfaces in the contact were investigated by X-ray photoelectron spectroscopy (bonding), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Raman spectroscopy (TEM). Surface and sub-surface structural modification of the coating and composition of the transferred tribolayer are discussed in detail. High friction in humid air was attributed to the absence of well-ordered WS 2 sliding interface. On the other hand, the existence of such interface explained a very low friction observed in dry air.

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“…The green color is due to the chromium(III) oxide (Cr 2 O 3 ), the main green chromophore in the mural painting, with bands at ca. 554 and 349 cm −1 [58,59]. The identified pollutants suggest that the strong pulverization observed in this wall painting is probably due to the successive transformation of calcite into gypsum.…”

Section: Mural Paintingmentioning

confidence: 88%

Vibrational spectroscopy for the study of Chilean cultural heritage

Campos

Aguayo

2015

Herit Sci

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Background: Natural and synthetic colouring products along with its associated supporting materials have been studied in several expressions of the Chilean cultural heritage using vibrational spectroscopy. These expressions include archaeological remains as well as works of art. Results: Among the materials studied so far we can count pigments found in archaeological sites from the north of Chile, in plaster (wall paintings) and in polychrome (beams), and dyes mainly related to added components on historic silk textiles. Identification of materials resulted to be relevant to know about Chilean culture through history. Conclusions: The vibrational knowledge obtained contributes to give solid data as a complement to the different information aspects collected by conservation professionals involved in the characterization and conservation procedures of cultural heritage and also it gives us the opportunity to share knowledge and to give value to objects that not always are of the public domain.

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Morphological and structural characterization of CrO2/Cr2O3 films grown by Laser-CVD

Cited by 63 publications

References 24 publications

Synthesis of Cr2O3-based nanocomposite coatings with incorporation of inorganic fullerene-like nanoparticles

Synthesis of Cr2O3-based nanocomposite coatings with incorporation of inorganic fullerene-like nanoparticles

Complex frictional analysis of self-lubricant W-S-C/Cr coating

Vibrational spectroscopy for the study of Chilean cultural heritage

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