Modification of electrical and surface properties of V2O3 multilayer films on resin-impregnated highly oriented pyrolytic graphite composite substrates by shrinkage stress relaxation with chemical additives

Optimizing Vanadium Pentoxide Thin Films and Multilayers from Dip-Coated Nanofluid Precursors

“…25,45 Recently it has been shown that dip coating of vanadium alkoxide precursors can result in surface cracking of the thin films. 37 During dip coating the substrate is drawn from the precursor at a controlled rate with the hydrolysis occurring once exposed to air. The hydrolysis of the alkoxide to its oxide after dip coating occurs rapidly so that an amorphous V 2 O 5 thin film is formed and the increased dewetting and beading normally experienced by the drop-casted liquid thin films is prevented.…”

“…The formation of thin films of V 2 O 5 for devices using a dip-coating technique would be beneficial for large area coverage with high uniformity often required for optical materials and functional coatings. By adjusting the alkoxide precursor and the crystallization procedure, thin films of vanadium oxide with different oxidative states can be produced. , By utilizing the deposition techniques in this work, thin films with a smooth and uniform morphology over large areas are possible. This low-roughness characteristic would be beneficial for materials such as vanadium dioxide (VO 2 ), which has recently been shown to act as a disordered metamaterial with blackbody-like thermal emissivity , and thermochromic , properties.…”

Low-Cost and Facile Synthesis of the Vanadium Oxides V2O3, VO2, and V2O5and Their Magnetic, Thermochromic and Electrochromic Properties

“…Finally, vanadium sesquioxide (V 2 O 3 ) exhibits a MIT coupled with a magnetic disordering versus temperature in heating mode . At room temperature, the V 2 O 3 crystal framework exhibits a paramagnetic behavior associated with a metallic conduction type (PM) and transforms to an antiferromagnetic insulator (AFI) near 150 K. − This interesting magnetic transition is correlated with a structural transformation from rhombohedral symmetry at room temperature to a monoclinic structure below the transition temperature …”

“…[23][24][25]41,42 Finally, vanadium sesquioxide (V 2 O 3 ) exhibits a MIT coupled with a magnetic disordering versus temperature in heating mode. 43 At room temperature, the V 2 O 3 crystal framework exhibits a paramagnetic behavior associated with a metallic conduction type (PM) and transforms to an antiferromagnetic insulator (AFI) near 150 K. 43−45 This interesting magnetic transition is correlated with a structural transformation from rhombohedral symmetry at room temperature to a monoclinic structure below the transition temperature. 46 Several synthetic routes such as microemulsion-mediated systems, 47 sol−gel, 48 and solvothermal and hydrothermal methods 10,12,15,49 have been successfully explored to fabricate different kinds of nanostructured vanadium oxides.…”

Thermo-Electrical Properties of Composite Semiconductor Thin Films Composed of Nanocrystalline Graphene-Vanadium Oxides

“…We observed that the cross-linking solid-state reactions between the vanadium-based oxides and the resin-impregnated graphite plate lead to the weight lost of the specimen (i.e., approximately 7.61% of the initial state), which are ascribed to the dehydration, the volatilization of impregnated resin, and carbon-oxygen surface reactions of graphite basal plane arising from the thermolability of the resin-impregnated graphite substrate. 41 Consequently, the coated sample with graphene-VOx composite thin films exhibits a relatively uniform morphological features, in which the extent of surface roughness is remarkably reduced (i.e., approximately 70% reduction in the surface roughness compared with the non-coated graphite sample), as shown in Figure 9(b). As mentioned above, these results imply that the thermally-etched surface modification occurs due to complex chemical reactions between the GO-VOx thin films and the acrylic resinimpregnated graphite substrates during the sol-gel process, particularly during the post-heat treatment.…”