Thermochromic and opacity behaviors in vanadium dioxide nanofilms: a theoretical study
Vanadium dioxide nanofilms are one of the most essential materials in electronic applications like smart windows. Therefore, studying and understanding the optical properties of such films is crucial to modify the parameters that control these properties. To this end, this work focuses on investigat...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2022-01-01
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| Series: | Materials Research Express |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/2053-1591/ac4733 |
| _version_ | 1797746710423797760 |
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| author | Ikhlas H Shallal Nidhal M Abdul-Ameer Shaymaa Q Abdul-Hasan Moafak C Abdulrida |
| author_facet | Ikhlas H Shallal Nidhal M Abdul-Ameer Shaymaa Q Abdul-Hasan Moafak C Abdulrida |
| author_sort | Ikhlas H Shallal |
| collection | DOAJ |
| description | Vanadium dioxide nanofilms are one of the most essential materials in electronic applications like smart windows. Therefore, studying and understanding the optical properties of such films is crucial to modify the parameters that control these properties. To this end, this work focuses on investigating the opacity as a function of the energy directed at the nanofilms with different thicknesses (1–100) nm. Effective mediator theories (EMTs), which are considered as the application of Bruggeman’s formalism and the Looyenga mixing rule, have been used to estimate the dielectric constant of VO _2 nanofilms. The results show different opacity behaviors at different wavelength ranges (ultraviolet, visible, and infrared). The results depict that the highest opacity of the insulating phase is achieved at the ultraviolet region and it reduces for the metal phase. Besides, the results demonstrate that the opacity possesses a redshift during the changes at the three phases. Regarding the infrared region, the lowest opacity value is achieved at the insulator phase and it increases to the highest value at the metal phase. In the visible region, the opacity behavior remains similar in the three phases. It is worth noting that the lowest opacity is found for thinner nanofilm. Since both the refractive index and the extinction index are among the most essential optical constants, hence, both of them were compared with the experiment results, and an excellent agreement is achieved between them. |
| first_indexed | 2024-03-12T15:40:45Z |
| format | Article |
| id | doaj.art-f93c0525d4154b688151706cd100e374 |
| institution | Directory Open Access Journal |
| issn | 2053-1591 |
| language | English |
| last_indexed | 2024-03-12T15:40:45Z |
| publishDate | 2022-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | Materials Research Express |
| spelling | doaj.art-f93c0525d4154b688151706cd100e3742023-08-09T16:01:30ZengIOP PublishingMaterials Research Express2053-15912022-01-019101500710.1088/2053-1591/ac4733Thermochromic and opacity behaviors in vanadium dioxide nanofilms: a theoretical studyIkhlas H Shallal0https://orcid.org/0000-0002-3241-8984Nidhal M Abdul-Ameer1Shaymaa Q Abdul-Hasan2Moafak C Abdulrida3Department of Physics, College of Education for Pure Science-Ibn Al-Haitham, University of Baghdad , Baghdad, IraqDepartment of Physics, College of Education for Pure Science-Ibn Al-Haitham, University of Baghdad , Baghdad, IraqDepartment of Physics, College of Education for Pure Science-Ibn Al-Haitham, University of Baghdad , Baghdad, IraqDepartment of Medical Instrumentations Techniques Engineering, Al-Salam University College , Baghdad, IraqVanadium dioxide nanofilms are one of the most essential materials in electronic applications like smart windows. Therefore, studying and understanding the optical properties of such films is crucial to modify the parameters that control these properties. To this end, this work focuses on investigating the opacity as a function of the energy directed at the nanofilms with different thicknesses (1–100) nm. Effective mediator theories (EMTs), which are considered as the application of Bruggeman’s formalism and the Looyenga mixing rule, have been used to estimate the dielectric constant of VO _2 nanofilms. The results show different opacity behaviors at different wavelength ranges (ultraviolet, visible, and infrared). The results depict that the highest opacity of the insulating phase is achieved at the ultraviolet region and it reduces for the metal phase. Besides, the results demonstrate that the opacity possesses a redshift during the changes at the three phases. Regarding the infrared region, the lowest opacity value is achieved at the insulator phase and it increases to the highest value at the metal phase. In the visible region, the opacity behavior remains similar in the three phases. It is worth noting that the lowest opacity is found for thinner nanofilm. Since both the refractive index and the extinction index are among the most essential optical constants, hence, both of them were compared with the experiment results, and an excellent agreement is achieved between them.https://doi.org/10.1088/2053-1591/ac4733vanadium dioxides nanofilmopacityabsorption coefficientrefractive indexextinction coefficient |
| spellingShingle | Ikhlas H Shallal Nidhal M Abdul-Ameer Shaymaa Q Abdul-Hasan Moafak C Abdulrida Thermochromic and opacity behaviors in vanadium dioxide nanofilms: a theoretical study Materials Research Express vanadium dioxides nanofilm opacity absorption coefficient refractive index extinction coefficient |
| title | Thermochromic and opacity behaviors in vanadium dioxide nanofilms: a theoretical study |
| title_full | Thermochromic and opacity behaviors in vanadium dioxide nanofilms: a theoretical study |
| title_fullStr | Thermochromic and opacity behaviors in vanadium dioxide nanofilms: a theoretical study |
| title_full_unstemmed | Thermochromic and opacity behaviors in vanadium dioxide nanofilms: a theoretical study |
| title_short | Thermochromic and opacity behaviors in vanadium dioxide nanofilms: a theoretical study |
| title_sort | thermochromic and opacity behaviors in vanadium dioxide nanofilms a theoretical study |
| topic | vanadium dioxides nanofilm opacity absorption coefficient refractive index extinction coefficient |
| url | https://doi.org/10.1088/2053-1591/ac4733 |
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