The influence of precursors and additives on the hydrothermal synthesis of VO2: A route for tuning the metal–insulator transition temperature

Souza, Angélica Marcílio de; Cercená, Rodrigo; Duarte, Rodrigo da Costa; Arcaro, Sabrina; Dal-Bó, Alexandre Gonçalves

doi:10.1016/j.ceramint.2020.06.127

Cited by 5 publications

(1 citation statement)

References 34 publications

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“…In recent studies Souza et al 38 , synthesized and characterized vanadium dioxide (VO 2 ) nanostructures with progressive thermochromic properties by hydrothermal methods, favoring a 22% reduction in the MIT temperature (metal-insulator transition) and in another study Duarte et al 39 they presented new classes of spiropyran and merocyanine that can possess changing color properties under UV and visible light and temperature fluctuations 38,39 . The results obtained show favorable potential applications in intelligent materials, such as identification ink, safety indicators in the petrochemical industry, smart windows, memory storage devices, food safety, research engineering, aerospace, gas vapor sensors, dyes for solar cells, other luminescent switches of solid-state materials, sportswear for the detection of physical exhaustion and/or management of lab-on-a-chip technologies, and finally thermal mapping used in biomedical sciences.…”

Section: Discussionmentioning

confidence: 99%

Production and Weathering Exposure of Thermochromic Coatings Used as Sensors to Protect Electricity Distribution Systems

Brogni,

Duarte,

Cercená

et al. 2023

Mat. Res.

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Currently, the overheating detection of electric system components is performed using thermal imaging devices, which depend on on-site regulation parameters, require skilled operators and suitable weather conditions. The development and application of innovative technologies to monitor hotspots has highlighted the use of sensors based on thermosensitive materials. In this study, a temperature sensor with thermochromic coating was developed. Thermochromic sensors covered with a varnish layer and nano-titanium oxide, in addition to thermochromic paint, were produced. A 2 3 experimental design was established to assess the performance of thermochromic sensors under artificial weathering conditions. Color measurements of the coatings were performed using the CIELAB method. Fourier-transform infrared (FTIR), UV-Vis (Ultraviolet-Visible), (thermogravimetric TGA, and Differential Scanning Calorimetry (DSC) analyses were performed on the sensors exposed to photodegradation to detect changes in the thermochromic coatings. The sensors exposed to thermodegradation, and salt spray weathering showed ΔE (total color difference) values below 1.50 points in the presence of TiO 2 . In comparison, the sensors exposed to photodegradation showed ΔE values above 10 points, and UV-Vis analysis revealed changes in the chemical structure of the coatings. These results demonstrate that the varnish layer and TiO 2 can help minimize the degradation effects of temperature, light, and salinity.

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