Surface morphology-optical properties relationship in thermochromic VO2 thin films obtained by air oxidation of vanadium nitride

被引：10
作者：
Garcia-Wong, A. C. [1 ]
Pilloud, D. [1 ]
Bruyere, S. [1 ]
Mangin, D. [1 ]
Migot, S. [1 ]
Pierson, J. F. [1 ]
Capon, F. [1 ]
机构：
[1] Univ Lorraine, Inst Jean Lamour, UMR CNRS 7198, F-54000 Nancy, France
来源：
JOURNAL OF MATERIOMICS | 2021年 / 7卷 / 04期
关键词：
Vanadium dioxide; Vanadium nitride; Thermochromism; Optical properties; Air oxidation; ENERGY-EFFICIENT; RAMAN-SCATTERING; TRANSITION; DIOXIDE; TEMPERATURE; EMISSIVITY; WINDOW; OPTIMIZATION; CAMOUFLAGE; COATINGS;
D O I：
10.1016/j.jmat.2020.12.005
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
In this paper, vanadium nitride (VN) thin films have been deposited on Al substrates by reactive magnetron sputtering. Thermochromic VO2 films have been obtained by air oxidation of VN samples performed at three temperatures (450, 525 and 550 degrees C) at various durations (lower than 50 min). X-ray diffraction and Raman spectrometry of the VN oxidized films indicate that VO2 and V2O5 are the only phases produced during the oxidation process. Vanadium dioxide is the first oxide formed. It coexists with VN in a long period at 450 degrees C or suddenly disappears at 525 and 550 degrees C. Whatever the temperature, V2O5 is exclusively detected after the total oxidation of VN. This oxide is detrimental to the thermochromic performance of films. The emissivity-switching properties of the oxidized films were analyzed by infrared camera in the 7.5-13 mm range. The comparison among all the samples exhibiting a thermochromic behavior shows that the maximum emissivity switch is independent of the oxidation temperature and the surface morphology of the samples. These results could open a new strategy in the investigation of VN oxidation as a method to obtain VO2, along with an insight into the correlation between surface morphology and optical properties. (C) 2020 The Chinese Ceramic Society. Production and hosting by Elsevier B.V.
引用
收藏
页码：657 / 664
页数：8
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