The effects of niobium on the structure and properties of VO2 films

Synthesis and thermochromic property studies on W doped VO2 films fabricated by sol-gel method

“…However, with increasing annealing temperature, the chemical stress in samples with different W contents is reduced in spite of its grain size enhanced. This result could be attributed to compensative effect of the additional electrons carriers and generated oxygen vacancies as proved by our Raman and XPS spectra studies, which is consistent with previous reports 18 , 44 , 47 , 48 .…”

“…The obvious switching in IR transmittance was observed in all samples. W-doped films annealed at 470 °C give low IR transmission switching ability (ΔT r ) of 29.2%, 24.5% and 16.4% (defined as ΔT r = T r24 °C -T r90 °C ) in spite of low transition temperatures (T c ) that is determined by (T c-heating + T c-cooling )/2, in which T c-heating and T c-cooling are the maximums of the dTr/dT in the heating and cooling cycle, consistent with Nb doped VO 2 studies 44 . The ΔT r was increased drastically after increasing the annealing temperature to 500 °C, which are 42.5%, 48%, and 43.1% for 1%, 1.5% and 3% W doped samples, with slightly increasing transition temperatures, respectively.…”

Direct and continuous hydrothermal flow synthesis of thermochromic phase pure monoclinic VO2 nanoparticles

“…Debye-Waller factors indexed as Z,m or l were constrained to be the same across all paths with the same index light transmittance T lum and a MST reduction. [40][41][42] Both samples, however, have a similar T lum of 15% and 14% for the doped and un-doped samples, respectively. Moreover, the transition temperature (MST) of the doped sample is around ca.…”

Optimized Atmospheric-Pressure Chemical Vapor Deposition Thermochromic VO2 Thin Films for Intelligent Window Applications

“…Films with a high density can show better Δ T sol because of a higher electron mobility and also present fewer defects, resulting in a decrease of incident light scattering and a higher T lum. (16) Both the growth rate and film density may be influenced by having a fine control over the temperature and flow rate of the precursors in APCVD. This is particularly achievable when using highly volatile precursors, and their selection is thus crucial for a high performance of thermochromic coatings.…”