Preparation and thermochromic properties of Ce-doped VO2 films

Song, Linwei; Zhang, Y.; Huang, Wanxia; Shi, Qiwu; Li, Danxia; Zhi‐Jian, Yang; Xu, Yinghao

doi:10.1016/j.materresbull.2013.02.016

Cited by 39 publications

(24 citation statements)

References 31 publications

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“…From these Figures, it is seen that the surface features change from granular [15] to worm-like structures indicating the strong effect of tungsten doping on morphology. It has also been reported previously that the doping in VO 2 changes the morphology [11][12][13]23] without explaining possible mechanism. For N 2 flow rate less and larger than 0.4 L min -1 , the morphology remains unchanged showing that there is either less than 1.5 at.…”

Section: Structurementioning

confidence: 85%

Atmospheric Pressure Chemical Vapor Deposition Of Amorphous Tungsten Doped Vanadium Dioxide For smart Window Applications

Louloudakis¹,

Vernardou²,

Spanakis³

et al. 2016

Adv. Mater. Lett.

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Amorphous tungsten doped vanadium dioxide coatings were grown on SnO 2-precoated glass substrates using the atmospheric pressure chemical vapor deposition of vanadium (V) triisopropoxide and tungsten (VI) isopropoxide at 450 o C without an oxygen source. The effect of N 2 flow rate through the tungsten's precursor bubbler was examined keeping the respective flow rate through the vanadium's precursor bubbler at 4 L min-1 for a growth period of 30 min. They were characterized by x-ray diffraction, Raman and x-ray photoelectron spectroscopy, field-emission scanning electron microscopy and UV-vis/IR transmittance. The samples grown using 0.4 L min-1 N 2 flow rate through the tungsten precursor's bubbler, showed the greatest reduction in transition temperature from 65.5 in granular VO 2 to 44 o C in worm-like V 0.985 W 0.015 O 2 structures approaching that required for commercial use as a smart window coating.

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Section: Structurementioning

confidence: 85%

Atmospheric Pressure Chemical Vapor Deposition Of Amorphous Tungsten Doped Vanadium Dioxide For smart Window Applications

Louloudakis¹,

Vernardou²,

Spanakis³

et al. 2016

Adv. Mater. Lett.

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“…The Tc of the films was typically decreased by 2 °C per at % doping [164], by 13 °C per 0.4% at [165] and by 15 °C per 2 at % Nb doping [166]. Other dopants explored include magnesium [167] and cerium [168] which decreased Tc by 3 °C and 4.5 °C, respectively per at % doping each. Fluorine has also been incorporated, 3 at % reduced Tc to 35 °C [169].…”

Section: Reducing the Transition Temperaturementioning

confidence: 99%

Thin Films for Advanced Glazing Applications

et al. 2016

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Functional thin films provide many opportunities for advanced glazing systems. This can be achieved by adding additional functionalities such as self-cleaning or power generation, or alternately by providing energy demand reduction through the management or modulation of solar heat gain or blackbody radiation using spectrally selective films or chromogenic materials. Self-cleaning materials have been generating increasing interest for the past two decades. They may be based on hydrophobic or hydrophilic systems and are often inspired by nature, for example hydrophobic systems based on mimicking the lotus leaf. These materials help to maintain the aesthetic properties of the building, help to maintain a comfortable working environment and in the case of photocatalytic materials, may provide external pollutant remediation. Power generation through window coatings is a relatively new idea and is based around the use of semi-transparent solar cells as windows. In this fashion, energy can be generated whilst also absorbing some solar heat. There is also the possibility, in the case of dye sensitized solar cells, to tune the coloration of the window that provides unheralded external aesthetic possibilities. Materials and coatings for energy demand reduction is highly desirable in an increasingly energy intensive world. We discuss new developments with low emissivity coatings as the need to replace scarce indium becomes more apparent. We go on to discuss thermochromic systems based on vanadium dioxide films. Such systems are dynamic in nature and present a more sophisticated and potentially more beneficial approach to reducing energy demand than static systems such as low emissivity and solar control coatings. The ability to be able to tune some of the material parameters in order to optimize the film performance for a given climate provides exciting opportunities for future technologies. In this article, we review recent progress and challenges in these areas and provide a perspective for future trends and developments.

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“…In another study, Suh et al used pulsed laser deposition (PLD) to produce round grains that coarsened from 50 nm to 200 nm as annealing time increased from 5 min to 80 min [17]. Other groups used the sol-gel method to deposit VO 2 films with spheroidal grains from 50 nm to 200 nm in diameter [16,35]. Zhang et al used a solution-based technique to deposit VO 2 on SnO 2 :F (FTO) glass substrates [36].…”

Section: Resultsmentioning

confidence: 99%