Advanced Materials Interfaces
·
2020
·Vol. 8
·期 1
·2001606
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IF 4.948
Zuohao Wen,Yujie Ke,Chengchen Feng,Shuliang Fang,Miuyang Sun,Xinghai Liu,Yi Long
The VO 2 -based smart windows can dynamically and reversibly adjust the indoor solar irradiation to reduce the energy consumption for building glasses. This paper reports the first successful preparation of Mg-doped VO 2 @ZrO 2 core−shell nanocrystals with promoted thermochromic performance as well as tunable appearance and wettability. The achieved combination of T lum of 52.4% and ∆ T sol of 7.1% is comparable to the best-reported results of VO 2 -based core−shell rod structures. The thickness of ZrO 2 shell is tunable between 3 and 14 nm, resulting in a slightly hydrophobic surface and a slight color change toward blue-green and brighter produced films. The preparation method based on hydrothermal and UV-curing methods is facile. This work may inspire future development of VO 2 synthesis, their structure−property, and the application the thermochromic films for energy-saving purposes in buildings or automobiles.
研究领域:
材料科学
·
能源技术
·
纳米技术
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Jiachen Qian,Bin Li,Shouqin Tian,Baoshun Liu,Xiujian Zhao
VO 2 -based thermochromic smart windows have attracted much attention due to their promising energy-saving effects. However, the high phase transition temperature ( T c , 68 °C), low luminous transmittance ( T lum , <40%) and solar energy modulation efficiency (Δ T sol , <10%) hindered their practical application. In order to improve these deficiencies simultaneously, the photothermal W 18 O 49 nanorods were introduced into VO 2 based nanothermochromic films in this work. The obtained film exhibited enhanced thermochromic performance ( T lum = 82.5%, Δ T sol = 10%) due to the incorporation of W 18 O 49 nanorods. And T lum of 63.3% and Δ T sol of 18.6% were presented for the bilayer film, which is one of the best reported performances for VO 2 films to date. In particular, the bilayer film exhibited an obvious energy saving effect with a reduction of 21.1 °C in indoor temperature compared with normal glass due to its excellent thermochromic properties. In addition, the thermochromic characteristics of VO 2 -W 18 O 49 -polyvinylpyrrolidone (PVP) composite films could be trigged at lower temperature than that of VO 2 film due to the additional thermal energy generated by the absorption of near-infrared light by W 18 O 49 nanorods. Therefore, the outstanding performance and the easily scaled solution-based synthesis route would facilitate the practical application of VO 2 -based smart windows.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
·
2022
·Vol. 648
·期 14
·e202200132
·
IF 1.414
Rui Pei,Xinguo Ma,Changcun Han,Zhifeng Liu,Zhengwang Cheng,Xiaoru Dong
Reducing the phase transition temperature ( T c ) of VO 2 films to achieve the application in the field of Smart Home is still a challenge. Thus, in the work, the ultra-thin VO 2 films with different Mo doping amounts were successfully prepared by an economic sol-gel method and atmosphere annealing, aiming to further investigate the mechanism of the decrease of T c . The results show that the VO 2 films with 3 at % Mo doping possess the T c of 29.5 °C. Notedly, in the as-prepared films, the maximum transmittance in the visible region ( T vis ) is 46.3 % and the solar direct transmittance ( T sol ) is 45.8 %. According to the XPS spectra, it is confirmed that the Mo doping prominently induces the valence change of V ions from +4 to +3, inhibiting the strain in the phase transition process of VO 2 films, and leading to the decrease of T c . Our work will provide a feasible solution for reducing the T c of the ultra-thin VO 2 films.
研究领域:
材料科学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 38
·13396-13404
·
IF 7.059
Liangmiao Zhang,Fang Xia,Jianing Yao,Tianli Zhu,Hui Xia,Guang Yang,Bin Liu,Yanfeng Gao
Monoclinic VO2(M) has been considered as one of the most promising materials for fabricating energy-saving smart windows, but its scalable synthesis is still a great challenge. In this work, pure and tungsten (W)-doped VO2(M) nanoparticles (20–50 nm) were prepared by a simple hydrothermal recrystallization method using an amorphous precursor obtained from coprecipitation in a mixed VOSO4 and NaOH solution (pH = 9). The phase transition temperature of the obtained W-doped VO2(M) nanoparticles decreases with increasing W-doping, by −28.4 °C per at% of W in the range of 0–1.1 at%. The mechanism of hydrothermal recrystallization was studied by using ex situ powder X-ray diffraction (PXRD) and in situ synchrotron radiation-based PXRD. It was found that the hydrothermal synthesis underwent two steps: (1) recrystallization of amorphous precursor to VO2(B) crystals, and (2) allotropic phase transformation from the metastable intermediate VO2(B) to VO2(M). In addition, the fabricated films using VO2(M) with 0.7 at% W-doping showed excellent thermochromic performance, with a suitable phase transition temperature of 42.7 °C, high average luminance transmittance of up to 61.7%, and good solar energy modulation ability of 11.7%, making them a suitable material for efficient and low-cost energy saving smart windows.
研究领域:
材料科学
·
纳米技术
·
能源效率
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2015
·
IF 2.999
Hua Zhang,Xiudi Xiao,Xuanming Lu,Guanqi Chai,Yaoming Sun,Yongjun Zhan,Gang Xu
In this paper, high crystallinity and pure phase VO 2 (M) powder is synthesized by a novel and facile method. Aiding by additional manual grinding and etching process, 22 nm high-quality VO 2 (M) nanoparticles can be obtained. The structure and properties of the VO 2 (M) particles were characterized by X-ray diffraction analysis, transmission electron microscopy, differential scanning calorimetry and UV–vis–NIR spectrophotometer. After mixing VO 2 (M) nanoparticles with transparent polymer, thin films prepared by grinded VO 2 nanoparticles show excellent thermochromic properties. The solar modulation ability is up to 12.4% with luminous transmittance of 62.7%. Moreover, The haze of films prepared by grinded VO 2 (M) nanoparticles is down to 1.9%, which is far less than that of films prepared by original VO 2 (Haze = 8.5%) and etched VO 2 particles (Haze = 4.6%). Dramatical improvement of thermochromic property and definition indicate that it is a promising method to prepare large-scale VO 2 nanoparticles and cost-effective smart window.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Jingting Zhu,Aibin Huang,Haibin Ma,Yining Ma,Kun Tong,Shidong Ji,Shanhu Bao,Xun Cao,Ping Jin
Vanadium dioxide (VO2), as a typical thermochromic material used in smart windows, is always limited by its weaker solar regulation efficiency (ΔTsol) and lower luminous transmittance (Tlum). Except for common approaches such as doping, coating, and special structure, compositing is another effective method. The macroscopic thermochromic (from colorless to blue) ionic liquid–nickel–chlorine (IL–Ni–Cl) complexes are selected in this paper to be combined with VO2 nanoparticles forming a composite film. This novel scheme demonstrates outstanding optical properties: ΔTsol = 26.45% and Tlum,l = 66.44%, Tlum,h = 43.93%. Besides, the addition of the IL–Ni–Cl complexes endows the film with an obvious color change from light brown to dark green as temperature rises. This splendid visible thermochromic performance makes the composite film superior in function exhibiting and application of smart windows.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2019
·
IF 3.42
Wan Zhang,Xiaoqian Ji,Kunlin Chen,Chaoxia Wang,Shiguo Sun
Rhodamine B octadecylamine (RBO) lipophilic derivative is developed as a new thermochromic pigment in both solid and liquid system with temperature controlled turn-on fluorescence and visible color-transformation performances. In liquid system, RBO exhibits color-transformation from light pink to rose red under illuminant D65 and presents temperature controlled turn-on fluorescence, which is attributed to the atom transmitting to an upper level by the thermal excitation. The log Intensity T fits a linear relationship in the body temperature range of 37 °C to 45 °C. In solid system, RBO displays reversible thermochromic performances from pink to yellow under visible light and transforms from fluorescence pink to colorless under UV light, which is originated from the conjugation structure conversion of RBO by monitoring the structure changes during heating via FT-IR spectra. The thermochromic rate in the repeated heating-cooling cycles is fast, calculated to be 0.17 s −1 (heating) and 0.05 s -1 (cooling), respectively. The RBO possesses a good thermostability up to 380 °C. The solid system RBO can be made into a hand-writable thermochromic pen. The deposition of RBO S on paper is easily performed by manual drawing. The image drawn using the pink RBO pen is visible as a pink coating, and showing a pink-to-colorlessness color change on paper under visible light with temperature increase. This new rhodamine derivative with special thermochromic property of turn-on fluorescence and visible color-transformation performance can be applied in both solid and liquid systems, which is promised as a thermochromic coating to replace the intrusive measurement techniques and play a role in external/internal temperature measurements.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Yunxiang Chen,Xianzhe Zeng,Jingting Zhu,Rong Li,Heliang Yao,Xun Cao,Shidong Ji,Ping Jin
For VO2-based thermochromic smart windows, high luminous transmittance (Tlum) and solar regulation efficiency (ΔTsol) are usually pursued as the most critical issues, which have been discussed in numerous researches. However, environmental durability, which has rarely been considered, is also so vital for practical application because it determines lifetime and cycle times of smart windows. In this paper, we report novel VO2@ZnO core–shell nanoparticles with ultrahigh durability as well as improved thermochromic performance. The VO2@ZnO nanoparticles-based thermochromic film exhibits a robust durability that the ΔTsol keeps 77% (from 19.1% to 14.7%) after 103 hours in a hyperthermal and humid environment, while a relevant property of uncoated VO2 nanoparticles-based film badly deteriorates after 30 h. Meanwhile, compared with the uncoated VO2-based film, the VO2@ZnO-based film demonstrates an 11.0% increase (from 17.2% to 19.1%) in ΔTsol and a 31.1% increase (from 38.9% to 51.0%) in Tlum. Such integrated thermochromic performance expresses good potential for practical application of VO2-based smart windows.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Optical Materials
·
2023
·
IF 9
Bin Li,Shouqin Tian,Longxiao Zhou,Senwei Wu,Tingfeng Ma,Guanjie He,Baoshun Liu,Xiujian Zhao
Vanadium dioxide (VO 2 ) has attracted widespread attention due to its extraordinary thermochromic properties. Visually transparent VO 2 films hold great promise for applying in smart windows, smart radiative coolers, solar cells, and microwave absorbing windows. However, it remains a huge challenge to simultaneously achieve ultra-high luminous transmittance ( T lum ) and excellent thermochromic performance due to their contradictory relationship. Here, a fully discrete VO 2 particulate (FDVP) film is developed. It shows an ultra-high T lum of 92.7% due to the reflectance being significantly reduced. Below the phase transition temperature ( T c , 69.1 °C), it is highly transparent to near-infrared (NIR) light, while above T c , it blocks NIR light through the strong localized surface plasmon resonance (LSPR) effect, resulting in an excellent solar energy modulation (Δ T sol ) of 10.5% for smart windows. In addition, a 3.5 at.%W-doped FDVP film exhibits a desired T c of 25.8 °C, an extremely narrow hysteresis width (Δ T ) of 4.6 °C, and good optical properties ( T lum = 92.0%, Δ T sol = 8.2%). The performance represents a new milestone for thermochromic VO 2 films. This work will shed light on the structural design for high-performance VO 2 films.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）