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Synthesis and structural characterization of mesoporous V2O5 thin films for electrochromic applications |
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| Authors: | A. Cremonesi D. Bersani Y. Djaoued |
| Affiliation: | a Physics Department and INSTM, University of Parma, Parco Area delle Scienze 7/A, 43100 Parma, Italy b Physics Department and CNISM, University of Parma, Parco Area delle Scienze 7/A, 43100 Parma, Italy c Université de Moncton-Campus de Shippagan, 218 boul. J.-D. Gauthier, Shippagan, N.-B., Canada E8S 1P6 d Physics Department, Mount Allison University, Sackville, N.-B., Canada E4L 1E6 |
| Abstract: | Mesoporous vanadium pentoxide (V2O5) films have been synthesized by hydrolysis of vanadium tri-isopropoxide (VO(OC3H7)3) in the presence of polyethylene glycol (PEG) as a structure-directing agent. The structure, the stoichiometry and the morphology of the films have been studied as a function of the thermal annealing by X-ray diffraction (XRD), micro-Raman spectroscopy, optical microscopy, scanning electron microscopy and atomic force microscopy. XRD patterns and Raman spectra show the presence of two previously unreported crystalline phases. The PEG:V2O5 molar ratio affects the temperature of phase formation, the amount and even the order in which the phases appear. The morphological characterization underlines the role of the surfactant to promote porous networks, formed by micrometric clusters of controlled shapes and patterns embedded in a homogeneous host matrix. |
| Keywords: | Vanadium oxide X-ray diffraction Micro-Raman spectroscopy Scanning electron microscopy |
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