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- Title
Structural and Visible-Near Infrared Optical Properties of Cr-Doped TiO for Colored Cool Pigments.
- Authors
Yuan, Le; Weng, Xiaolong; Zhou, Ming; Zhang, Qingyong; Deng, Longjiang
- Abstract
Chromium-doped TiO pigments were synthesized via a solid-state reaction method and studied with X-ray diffraction, SEM, XPS, and UV-VIS-NIR reflectance spectroscopy. The incorporation of Cr accelerates the transition from the anatase phase to the rutile phase and compresses the crystal lattice. Moreover, the particle morphology, energy gap, and reflectance spectrum of Cr-doped TiO pigments is affected by the crystal structure and doping concentration. For the rutile samples, some of the Cr ions are oxidized to Cr after sintering at a high temperature, which leads to a strong near-infrared absorption band due to the A → T electric dipole-allowed transitions of Cr. And the decrease of the band gap causes an obvious redshift of the optical absorption edges as the doping concentration increases. Thus, the VIS and near-infrared average reflectance of the rutile TiCrO sample decrease by 60.2 and 58%, respectively, when the Cr content increases to x = 0.0375. Meanwhile, the color changes to black brown. However, for the anatase TiCrO pigments, only the VIS reflection spectrum is inhibited by forming some characteristic visible light absorption peaks of Cr. The morphology, band gap, and NIR reflectance are not significantly affected. Finally, a Cr-doped anatase TiO pigment with a brownish-yellow color and 90% near-infrared reflectance can be obtained.
- Subjects
X-ray diffraction; ELECTROMAGNETIC wave diffraction; CRYSTAL lattices; LATTICE theory; NEAR infrared radiation
- Publication
Nanoscale Research Letters, 2017, Vol 12, Issue 1, p1
- ISSN
1931-7573
- Publication type
Article
- DOI
10.1186/s11671-017-2365-5