abstract

• A simple chemical method for the tunability of the optical properties of TiO2 nanoparticles-doped VO2 thin films is reported. Although deposited thin films revealed granular morphology, an increase in dopant concentration showed increased homogeneity (smaller crystallite size). The insulator-to-metal transition, monitored by UV–vis-NIR reflectivity, is adjusted through a simple model based on a sum of Lorentzians and Gaussians to follow the changes in the optical spectra, which in turn allows us to extract the corresponding refractive index and extinction coefficient. In addition, the reflection spectrum in low frequency range (<700 nm), reveals new variations in the doped samples triggered by the changes in temperature, which allows an extended optical operating range, for instance, in smart windows applications. © 2022 Elsevier B.V.

authors

• Agarwal V.
• Amador-Alvarado S.
• Ariza Flores Augusto David
• Kumar Y.

publication date

• 2022-01-01

funding provided via

• U.S. Department of Veterans Affairs, VA: 1577, 226291; Consejo Nacional de Ciencia y Tecnología, CONACYT: A1-S-30393  Grant

published in

• Materials Letters  Journal

keywords

• Extinction coefficient; Reflectivity; Refractive index; Vanadium dioxide Crystallite size; Metal insulator transition; Morphology; Oxide minerals; Reflection; Thin films; TiO2 nanoparticles; Titanium dioxide; Vanadium dioxide; Chemical method; Dopant concentrations; Extinction coefficients; Granular morphology; Insulator-to-metal transitions; Simple++; Thin-films; Tunabilities; UV-visible; VO 2 thin films; Refractive index

Digital Object Identifier (DOI)

• 10.1016/j.matlet.2022.132541

PubMed ID

start page

end page

volume

• 323

issue