RT journal article
T1 Towards the optimization of a simple route for the fabrication of energy-efficient VO2-based smart coatings
T2 Hacia la optimización de una ruta simple para la fabricación de recubrimientos inteligentes basados ​​en VO 2 energéticamente eficientes
A1 Santos Izquierdo-Bueno, Antonio Jesús
A1 Martin, Nicolas
A1 Outón Porras, Javier
A1 Blanco Ollero, Eduardo
A1 García Roja, Rafael
A1 Morales Sánchez, Francisco Miguel
A2 Ciencia de los Materiales e Ingeniería Metalúrgica y Química Inorgánica
A2 Física de la Materia Condensada
K1 Glancing angle deposition
K1 Metal-insulator transition
K1 Rapid thermal annealing
K1 Smart window
K1 Thin film
K1 Vanadium dioxide
K1 Vis-NIR spectrophotometry
K1 Dióxido de vanadio
K1 Película delgada
K1 Deposición de ángulo de mirada
K1 Recocido térmico rápido
K1 Espectrofotometría Vis-NIR
K1 Transición metal-aislante
K1 ventana inteligente
AB The present work reports on the optimization of a simple two-step procedure to achieve thermochromic vanadium dioxide coatings. The effect of the layer thickness, the total surface area exposed, as well as different parameters involved in a fast annealing process leads to the selective oxidation in air atmosphere of vanadium films sputtered at glancing angles. Outcomes resulting from structural and optical characterizations of annealed films with different layer thicknesses and porosities disclose two optimal pathways for the fast heating synthesis of high-performance VO2-based coatings with unique thermochromic features. A first one at 475 °C with reaction times ranging from 40 to 60 s, ideal for thicker films (∼100 nm), which implies reaching pseudo-equilibrium states with the formation of a VO2 + VO2+x phase mixture. A second one more adapted for thinner samples (∼25 nm), which involves obtaining VO2-refined products through instantaneous reactions at 500 °C. The unusual balance achieved for luminous transmittance (>60%) and solar modulation ability (∼5%) through the second route, coupled with a remarkable decrease in the metal-to-insulator transition temperature without the need of using doping (up to 15 °C below that of the pure bulk VO2, i.e., ∼68 °C), make these initially porous systems potentially applicable in energy efficient smart glazing or resistive switching while paving the way for further initiatives towards the simple and cost-effective manufacturing of VO2 thermochromic coatings at a large scale. © 2023 The Author(s)
PB Elsevier
SN 0927-0248
YR 2023
FD 2023-06-01
LK http://hdl.handle.net/10498/28658
UL http://hdl.handle.net/10498/28658
LA eng
NO A. J. Santos would like to thank the University of Cadiz and the Spanish Ministerio de Universidades for the concession of a "Margarita Salas" postdoctoral fellowship funded by the European Union - Next-GenerationEU (sol-202100211960-tra). J. Outon acknowledges the support by the Spanish Ministerio de Educacion y Cultura through grant FPU19-02638. University of Cadiz and IMEYMAT are also acknowledged by financing the mutual facilities available at the UCA R&D Central Services (SC-ICYT), the UCA project references "PUENTE PR2020-003" and "OTRI AT2019/032", and the IMEYMAT project reference "LINEAS PRIORITARIAS PLP2021120-1". This work was supported by the Spanish State R&D project (Retos y Generacion de Conocimiento) ref. PID2020-114418RBI00. The regional government of Andalusia with FEDER co-funding also participates through the projects AT-5983 Trewa 1157178 and FEDER-UCA18-10788. This work was partly supported by the french RENATECH network, FEMTO-ST technological facility, by the Region Bourgogne-Franche-Comte and by EIPHI Graduate School (Contract "ANR-17-EURE-0002").
DS Repositorio Institucional de la Universidad de Cádiz
RD 10-nov-2026