Optimized infrared switching properties in thermochromic vanadium dioxide thin films: role of deposition process and microstructure

Guinneton, F.; Sauques, Laurent; Valmalette, Jean‐Christophe; Cros, F.; Gavarri, J.R.

doi:10.1016/j.tsf.2003.09.062

Cited by 120 publications

(84 citation statements)

References 20 publications

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“…In the absence of UV irradiation, these films demonstrated visible transmittances ranging from 60 to 75 % and NIR switching efficiencies in the range 17-32 %. Thickness is the parameter that most affects the visible transmittance and NIR switching efficiency of VO 2 films, as has been observed previously [39]. With UV irradiation, the films of various thicknesses (Fig.…”

Section: Morphology Of the Ti/v Oxide Complexsupporting

confidence: 63%

Synthesis of doubly functional nanowhiskers from a colloid solution including a V–Ti complex precursor

Chen

2012

J Mater Sci

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In this study, we synthesized vanadium (V) nanoparticles precursor (NH 4 ) 5 [(VO) 6 (CO 3 ) 4 (OH) 9 ]Á10H 2 O a two-phase system of toluene and water. Colloid solution including titanium(IV) isopropoxide and polyvinylpyrrolidone (PVP) was subsequently deposited onto the nanoparticles to form urchin-like structures in a toluene solution as the vanadium-titanium (V-Ti) complex precursor. Calcining the urchin-like precursor at 700°C generated nanowhiskers of the Ti/V oxide complex after annealing process. These nanowhiskers were characterized using transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD), and X-ray photoelectron microscopy (XPS). Films of the Ti/V oxide nanowhisker structure exhibited good visible transparency and a large change in transmittance at near-infrared (NIR) wavelengths before and after the metal-insulator phase transition. For a 44-nm-thick single-layer nanowhisker thin film, the transmittances at 700 nm in the metallic (M) and semiconductive (S) states were 75 and 72.2 %, respectively; the NIR switching efficiency (DT 2000 ) increased from 17 to 21.3 % at 2000 nm under UV light irradiation. In addition, the nanowhisker thin film of the Ti/V oxide complex significantly enhanced the photodecomposition of methylene blue under UV irradiation, relative to that of the unmodified TiO 2 . The dual functions of this material-thermochromicity and photocatalytic behavior-suggest that it might have interesting applications in energy-saving smart windows.

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Section: Morphology Of the Ti/v Oxide Complexsupporting

confidence: 63%

Synthesis of doubly functional nanowhiskers from a colloid solution including a V–Ti complex precursor

Chen

2012

J Mater Sci

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“…Numerous studies indicate that, the thermochromic efficiency of vanadium dioxide is dependent on a large number of different parameters, such as substrate temperature [173], annealing temperature [170][171][172][173], microstructure [155,174,175] and surface morphology [170,174,[176][177][178][179]. The situation is further complicated as doping with high valency metals also impacts upon the thermochromic efficiency, usually in a detrimental manner [179][180][181][182][183].…”

Section: Improving Thermochromic Efficiencymentioning

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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“…Because of the SMT, which is ultrafast [4], vanadium dioxide is a unique material, very promising for various applications both in electronics and in optics. Upon the phase transition at T c , many physical parameters of VO 2 abruptly change with a characteristic hysteresis loop with a narrow temperature width of about (2 to 3) • C in single crystals, and a large one of about (10 to 40) • C in thin films [5][6][7][8][9][10]. In thin films an enlargement of the hysteresis loop is observed, which is due to the presence of a great number of nanocrystals with different sizes while the hysteresis loop of the polycrystal results from the sum of all the elementary hysteresis cycles in each nanocrystal [6].…”

Section: Introductionmentioning

confidence: 99%

Photothermal Characterization of Thermochromic Materials for Tunable Thermal Devices

et al. 2014

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A detailed infrared study of the semiconductor-to-metal transition (SMT) in a vanadium dioxide (VO2) film deposited on a silicon wafer is presented. The (VO2) phase transition is studied in the mid-infrared (MIR) region by analyzing the transmittance and the reflectance measurements, and the calculated emissivity. The temperature behavior of the emissivity during the SMT puts into evidence the phenomenon of the anomalous absorption in (VO2) which has been explained by applying the Maxwell-Garnett effective medium approximation theory, together with a strong hysteresis phenomenon, both useful to design tunable thermal devices. Photothermal radiometry has been applied in order to study the changes in the modulated emissivity induced by a laser. Experimental results show how the use of these techniques represent a good tool for a quantitative measurement of the optothermal properties of vanadium dioxide-based structure

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Optimized infrared switching properties in thermochromic vanadium dioxide thin films: role of deposition process and microstructure

Cited by 120 publications

References 20 publications

Synthesis of doubly functional nanowhiskers from a colloid solution including a V–Ti complex precursor

Synthesis of doubly functional nanowhiskers from a colloid solution including a V–Ti complex precursor

Thin Films for Advanced Glazing Applications

Photothermal Characterization of Thermochromic Materials for Tunable Thermal Devices

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