Synthesis of High Near-Infrared Reflective Black Pigment Based on YMn<sub>2</sub>O<sub>5</sub>
Y(Mn<sub>0.95</sub>M<sub>0.05</sub>)<sub>2</sub>O<sub>5</sub> (M = Al, Fe, Ga, Ti, and Zr) samples were synthesized via a sol–gel method using citric acid to find a new near-infrared (NIR) reflective black pigment. Among these samples, the optical refl...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2023-12-01
|
| Series: | Colorants |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2079-6447/2/4/36 |
| _version_ | 1797381516619153408 |
|---|---|
| author | Kazuki Yamaguchi Satoru Mochizuki Yudai Nagato Takuro Morimoto Toshiyuki Masui |
| author_facet | Kazuki Yamaguchi Satoru Mochizuki Yudai Nagato Takuro Morimoto Toshiyuki Masui |
| author_sort | Kazuki Yamaguchi |
| collection | DOAJ |
| description | Y(Mn<sub>0.95</sub>M<sub>0.05</sub>)<sub>2</sub>O<sub>5</sub> (M = Al, Fe, Ga, Ti, and Zr) samples were synthesized via a sol–gel method using citric acid to find a new near-infrared (NIR) reflective black pigment. Among these samples, the optical reflectance of Y(Mn<sub>0.95</sub>Fe<sub>0.05</sub>)<sub>2</sub>O<sub>5</sub> and Y(Mn<sub>0.95</sub>Ga<sub>0.05</sub>)<sub>2</sub>O<sub>5</sub> in the near-infrared region was found to be larger than that of YMn<sub>2</sub>O<sub>5</sub>. Then, the concentration of the dopant (Fe or Ga) was changed between 0 and 15%, and the resulting UV–Vis–NIR reflectance spectra were measured. As a result, the optical reflectance of the Fe-doped samples decreased in the near-infrared region, while that of the Ga-doped samples increased. Accordingly, Y(Mn<sub>1<i>−x</i></sub>Ga<i><sub>x</sub></i>)<sub>2</sub>O<sub>5</sub> (0 ≤ <i>x</i> ≤ 0.20) samples were synthesized, and the crystal structure, particle size, optical properties, and color of the samples were characterized. The single-phase samples were obtained in the composition range of 0 ≤ <i>x</i> ≤ 0.15, and the lattice volume decreased with increasing Ga<sup>3+</sup> concentration. Optical absorption below 850 nm was attributed to the charge transfer transition between O<sub>2p</sub> and Mn<sub>3d</sub> orbitals, and the absorption wavelength of Y(Mn<sub>1<i>−x</i></sub>Ga<i><sub>x</sub></i>)<sub>2</sub>O<sub>5</sub> shifted to the shorter wavelength side as the Ga<sup>3+</sup> content increased, because of the decrease in the Mn<sup>3+</sup> concentration. Although the sample color became slightly reddish black by the Ga<sup>3+</sup> doping, the solar reflectance in the near-infrared region reached 47.6% at the composition of Y(Mn<sub>0.85</sub>Ga<sub>0.15</sub>)<sub>2</sub>O<sub>5</sub>. Furthermore, this NIR reflectance value was higher than those of the commercially available products (<i>R</i> < 45%). |
| first_indexed | 2024-03-08T20:52:42Z |
| format | Article |
| id | doaj.art-665d3958dae84269ad00984b953d3d3a |
| institution | Directory Open Access Journal |
| issn | 2079-6447 |
| language | English |
| last_indexed | 2024-03-08T20:52:42Z |
| publishDate | 2023-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Colorants |
| spelling | doaj.art-665d3958dae84269ad00984b953d3d3a2023-12-22T14:01:12ZengMDPI AGColorants2079-64472023-12-012470571510.3390/colorants2040036Synthesis of High Near-Infrared Reflective Black Pigment Based on YMn<sub>2</sub>O<sub>5</sub>Kazuki Yamaguchi0Satoru Mochizuki1Yudai Nagato2Takuro Morimoto3Toshiyuki Masui4Department of Chemistry and Biotechnology, Faculty of Engineering, and Center for Research on Green Sustainable Chemistry, Tottori University, 4-101, Koyama-cho Minami, Tottori 680-8552, JapanDepartment of Chemistry and Biotechnology, Faculty of Engineering, and Center for Research on Green Sustainable Chemistry, Tottori University, 4-101, Koyama-cho Minami, Tottori 680-8552, JapanDepartment of Chemistry and Biotechnology, Faculty of Engineering, and Center for Research on Green Sustainable Chemistry, Tottori University, 4-101, Koyama-cho Minami, Tottori 680-8552, JapanDepartment of Chemistry and Biotechnology, Faculty of Engineering, and Center for Research on Green Sustainable Chemistry, Tottori University, 4-101, Koyama-cho Minami, Tottori 680-8552, JapanDepartment of Chemistry and Biotechnology, Faculty of Engineering, and Center for Research on Green Sustainable Chemistry, Tottori University, 4-101, Koyama-cho Minami, Tottori 680-8552, JapanY(Mn<sub>0.95</sub>M<sub>0.05</sub>)<sub>2</sub>O<sub>5</sub> (M = Al, Fe, Ga, Ti, and Zr) samples were synthesized via a sol–gel method using citric acid to find a new near-infrared (NIR) reflective black pigment. Among these samples, the optical reflectance of Y(Mn<sub>0.95</sub>Fe<sub>0.05</sub>)<sub>2</sub>O<sub>5</sub> and Y(Mn<sub>0.95</sub>Ga<sub>0.05</sub>)<sub>2</sub>O<sub>5</sub> in the near-infrared region was found to be larger than that of YMn<sub>2</sub>O<sub>5</sub>. Then, the concentration of the dopant (Fe or Ga) was changed between 0 and 15%, and the resulting UV–Vis–NIR reflectance spectra were measured. As a result, the optical reflectance of the Fe-doped samples decreased in the near-infrared region, while that of the Ga-doped samples increased. Accordingly, Y(Mn<sub>1<i>−x</i></sub>Ga<i><sub>x</sub></i>)<sub>2</sub>O<sub>5</sub> (0 ≤ <i>x</i> ≤ 0.20) samples were synthesized, and the crystal structure, particle size, optical properties, and color of the samples were characterized. The single-phase samples were obtained in the composition range of 0 ≤ <i>x</i> ≤ 0.15, and the lattice volume decreased with increasing Ga<sup>3+</sup> concentration. Optical absorption below 850 nm was attributed to the charge transfer transition between O<sub>2p</sub> and Mn<sub>3d</sub> orbitals, and the absorption wavelength of Y(Mn<sub>1<i>−x</i></sub>Ga<i><sub>x</sub></i>)<sub>2</sub>O<sub>5</sub> shifted to the shorter wavelength side as the Ga<sup>3+</sup> content increased, because of the decrease in the Mn<sup>3+</sup> concentration. Although the sample color became slightly reddish black by the Ga<sup>3+</sup> doping, the solar reflectance in the near-infrared region reached 47.6% at the composition of Y(Mn<sub>0.85</sub>Ga<sub>0.15</sub>)<sub>2</sub>O<sub>5</sub>. Furthermore, this NIR reflectance value was higher than those of the commercially available products (<i>R</i> < 45%).https://www.mdpi.com/2079-6447/2/4/36black pigmentenvironmentally friendlyMn<sup>4+</sup> ionyttrium manganate |
| spellingShingle | Kazuki Yamaguchi Satoru Mochizuki Yudai Nagato Takuro Morimoto Toshiyuki Masui Synthesis of High Near-Infrared Reflective Black Pigment Based on YMn<sub>2</sub>O<sub>5</sub> Colorants black pigment environmentally friendly Mn<sup>4+</sup> ion yttrium manganate |
| title | Synthesis of High Near-Infrared Reflective Black Pigment Based on YMn<sub>2</sub>O<sub>5</sub> |
| title_full | Synthesis of High Near-Infrared Reflective Black Pigment Based on YMn<sub>2</sub>O<sub>5</sub> |
| title_fullStr | Synthesis of High Near-Infrared Reflective Black Pigment Based on YMn<sub>2</sub>O<sub>5</sub> |
| title_full_unstemmed | Synthesis of High Near-Infrared Reflective Black Pigment Based on YMn<sub>2</sub>O<sub>5</sub> |
| title_short | Synthesis of High Near-Infrared Reflective Black Pigment Based on YMn<sub>2</sub>O<sub>5</sub> |
| title_sort | synthesis of high near infrared reflective black pigment based on ymn sub 2 sub o sub 5 sub |
| topic | black pigment environmentally friendly Mn<sup>4+</sup> ion yttrium manganate |
| url | https://www.mdpi.com/2079-6447/2/4/36 |
| work_keys_str_mv | AT kazukiyamaguchi synthesisofhighnearinfraredreflectiveblackpigmentbasedonymnsub2subosub5sub AT satorumochizuki synthesisofhighnearinfraredreflectiveblackpigmentbasedonymnsub2subosub5sub AT yudainagato synthesisofhighnearinfraredreflectiveblackpigmentbasedonymnsub2subosub5sub AT takuromorimoto synthesisofhighnearinfraredreflectiveblackpigmentbasedonymnsub2subosub5sub AT toshiyukimasui synthesisofhighnearinfraredreflectiveblackpigmentbasedonymnsub2subosub5sub |