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题名:
Thermochromic VO2 films from ammonium citrato-oxovanadate(IV) with excellent optical and phase transition properties
作者: Zhang, J; Tian, H; Hao, L; Jin, X; Yang, CM; Wang, J; Cui, XM; Wang, CH; Zhang, C; Zhang, C; Xu, Y
刊名: JOURNAL OF MATERIALS CHEMISTRY C
出版日期: 2016
卷号: 4, 期号:23, 页码:5281—5288
关键词: CHEMICAL-VAPOR-DEPOSITION ; METAL-INSULATOR-TRANSITION ; DIOXIDE THIN-FILMS ; SMART WINDOW ; VANADIUM ; TRANSMITTANCE ; NANOPARTICLES ; PRECURSOR ; COATINGS ; TEMPERATURE
DOI: 10.1039/c6tc00315j
通讯作者: Xu, Y (reprint author), Chinese Acad Sci, Xian Inst Opt & Precis Mech, State Key Lab Transient Opt & Photon, Xian 710119, Shaanxi, Peoples R China.
文章类型: 期刊文献
英文摘要: Thermochromic VO2 film is a potential material for energy-saving windows in future buildings. Considering the difficulty in controlling the valence state and polymorphism during the formation of VO2 (M) film, we propose a facile and safe solution method of fabricating monoclinic (M) VO2 film directly from the newly synthesized ammonium citrato-oxovanadate(IV) compound [(NH4)(4)[V2O2(C6H4O7)(2)]center dot 2H(2)O, denoted as CA-V(IV)], as a vanadium(IV) precursor to stabilize vanadium in the 4+ valence state without utilizing V2O5 as an intermediate or complex post-treatment in vacuum. This new ambient-stable compound CA-V(IV) contains centrosymmetric dinuclear complex anions [{VO(C6H4O7)}(2)](4-), in which the carboxylate groups are coordinated to the V4+ ions in a monodentate fashion and each vanadium atom exhibits distorted octahedral geometry. With a perfect monoclinic phase, the VO2 films possessed excellent thermochromic and visible transmissive properties. Accompanying a change in film thickness from 119 nm to 41 nm, the integral visible transmittance T-vis at 25 degrees C of VO2 films ranged from 38.4% to 70.0%. The maximum visible transmittance (T-max) reached 77.2% for VO2 film with a thickness of 41 nm, which shows that the phase transition of VO2 did not greatly affect the visible transmittance of the film. For the VO2 film with a thickness of 41 nm, of which the visible transmittance modulation (Lambda T-vis = 2.1%) was the largest among the three samples, the solar energy modulation (Delta T-sol) reached 11.3%. Moreover, the transition temperature of our VO2 films was far below that of bulk VO2 (68 degrees C), and the best transition temperature was as low as 50.8 degrees C.
收录类别: SCI
语种: 英语
WOS记录号: WOS:000378273700015
ISSN号: 2050-7526
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.sinap.ac.cn/handle/331007/25873
Appears in Collections:中科院上海应用物理研究所2011-2017年_期刊论文

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Recommended Citation:
Zhang, J,Tian, H,Hao, L,et al. Thermochromic VO2 films from ammonium citrato-oxovanadate(IV) with excellent optical and phase transition properties[J]. JOURNAL OF MATERIALS CHEMISTRY C,2016-01-01,4(23):5281—5288.
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