Reversible, repeatable and low phase transition behaviour of spin coated nanostructured vanadium oxide thin films with superior mechanical properties
| Autor: | Dipta Mukherjee, Arjun Dey, Parthasarathi Bera, Debajyoti Palai, Anand Kumar Sharma, Anoop Kumar Mukhopadhyay, N. Sridhara, Manjima Bhattacharya, A. Carmel Mary Esther, A. Rajendra |
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| Rok vydání: | 2018 |
| Předmět: |
Spin coating
Materials science Process Chemistry and Technology Analytical chemistry 02 engineering and technology Nanoindentation 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Vanadium oxide 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Differential scanning calorimetry X-ray photoelectron spectroscopy Transmission electron microscopy Materials Chemistry Ceramics and Composites Thin film 0210 nano-technology Sheet resistance |
| Zdroj: | Ceramics International. 44:8913-8921 |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/j.ceramint.2018.02.085 |
| Popis: | Smooth, uniform and crystalline vanadium oxide thin films were deposited on quartz by spin coating technique with four different rpm i.e., 1000, 2000, 3000 and 4000 and subsequently post annealed at 350, 450 and 550 degrees C in vacuum. Transmission electron microscopy (TEM), Field emission scanning electron microscopy (FESEM) and X-ray diffraction (XRD) techniques were utilized for microstructural characterizations and phase analysis, respectively, for vanadium oxide powder and deposited film. Nanorods were observed to be grown after vacuum annealing. X-ray photoelectron spectroscopy (XPS) technique was utilized to study the elemental oxidation state of deposited vanadium oxide films. Thermo-optical and electrical properties such as solar transmittance (tau(s)), reflectance (rho(s)), absorptance (alpha(s)), infrared (IR) emittance (epsilon(ir)) and sheet resistance (R-s) of different thin films were evaluated. Based on the optical characteristics the optimized condition of the film processing was identified to be spin coated at 3000 rpm. Subsequently, the nanoindentation technique was utilized to measure hardness and Young's modulus of the optimized film. The measured nanomechanical properties were found to be superior to those reported for sputtered vanadium oxide films. Finally, temperature dependent phase transition characteristics of optimized vanadium oxide films were studied by differential scanning calorimetry (DSC) technique. Reversible and repeatable phase transition was found to occur in the range of 44-48 degrees C which was significantly lower than the phase transition temperature (i.e., 68 degrees C) of bulk VO2. |
| Databáze: | OpenAIRE |
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