Engineering an ultrathin amorphous TiO2 layer for boosting the weatherability of TiO2 pigment with high lightening power

doi:10.1016/j.cjche.2019.04.002

Chinese Journal of Chemical Engineering ›› 2019, Vol. 27 ›› Issue (11): 2825-2834.DOI: 10.1016/j.cjche.2019.04.002

• Materials and Product Engineering • Previous Articles Next Articles

Engineering an ultrathin amorphous TiO₂ layer for boosting the weatherability of TiO₂ pigment with high lightening power

Yangyang Yu¹, Kejing Wu², Shiyu Lu³, Kui Ma¹, Shan Zhong¹, Hegui Zhang¹, Yingming Zhu², Jing Guo⁴, Hairong Yue^1,2, Changjun Liu^1,2, Siyang Tang¹, Bin Liang^1,2

1 Low-Carbon Technology and Chemical Reaction Engineering Laboratory, School of Chemical Engineering, Sichuan University, Chengdu 610065, China;
2 Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu 610207, China;
3 Institute for Clean Energy & Advanced Materials, Faculty of Materials and Energy, Southwest University, Chongqing 400715, China;
4 Shanxi Province Key Laboratory of Higee-Oriented Chemical Engineering, North University of China, Taiyuan 030051, China

Received:2018-11-12 Revised:2019-03-25 Online:2020-01-19 Published:2019-11-28
Contact: Bin Liang
Supported by:
Supported by the National Key R&D Program of China (2018YFB0605700).

Engineering an ultrathin amorphous TiO₂ layer for boosting the weatherability of TiO₂ pigment with high lightening power

Yangyang Yu¹, Kejing Wu², Shiyu Lu³, Kui Ma¹, Shan Zhong¹, Hegui Zhang¹, Yingming Zhu², Jing Guo⁴, Hairong Yue^1,2, Changjun Liu^1,2, Siyang Tang¹, Bin Liang^1,2

1 Low-Carbon Technology and Chemical Reaction Engineering Laboratory, School of Chemical Engineering, Sichuan University, Chengdu 610065, China;
2 Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu 610207, China;
3 Institute for Clean Energy & Advanced Materials, Faculty of Materials and Energy, Southwest University, Chongqing 400715, China;
4 Shanxi Province Key Laboratory of Higee-Oriented Chemical Engineering, North University of China, Taiyuan 030051, China

通讯作者: Bin Liang
基金资助:
Supported by the National Key R&D Program of China (2018YFB0605700).

Abstract

Abstract: TiO₂ pigments are typically coated with inert layers to suppress the photocatalytic activity and improve the weatherability. However, the traditional inert layers have a lower refractive index compared to TiO₂, and therefore reduce the lightening power of TiO₂. In the present work, a uniform, amorphous, 2.9-nm-thick TiO₂ protective layer was deposited onto the surface of anatase TiO₂ pigments according to pulsed chemical vapor deposition at room temperature, with TiCl₄ as titanium precursor. Amorphous TiO₂ coating layers exhibited poor photocatalytic activity, leading to a boosted weatherability. Similarly, this coating method is also effective for TiO₂ coating with amorphous SiO₂ and SnO₂ layers. However, the lightening power of amorphous TiO₂ layer is higher than those of amorphous SiO₂ and SnO₂ layers. According to the measurements of photoluminescence lifetime, surface photocurrent density, charge-transfer resistance, and electron spin resonance spectroscopy, it is revealed that the amorphous layer can prevent the migration of photogenerated electrons and holes onto the surface, decreasing the densities of surface electron and hole, and thereby suppress the photocatalytic activity.

Key words: TiO₂ pigments, Pulsed chemical vapor deposition, Ultrathin layer, Weatherability, Lightening power, Photocatalytic suppression mechanism

摘要： TiO₂ pigments are typically coated with inert layers to suppress the photocatalytic activity and improve the weatherability. However, the traditional inert layers have a lower refractive index compared to TiO₂, and therefore reduce the lightening power of TiO₂. In the present work, a uniform, amorphous, 2.9-nm-thick TiO₂ protective layer was deposited onto the surface of anatase TiO₂ pigments according to pulsed chemical vapor deposition at room temperature, with TiCl₄ as titanium precursor. Amorphous TiO₂ coating layers exhibited poor photocatalytic activity, leading to a boosted weatherability. Similarly, this coating method is also effective for TiO₂ coating with amorphous SiO₂ and SnO₂ layers. However, the lightening power of amorphous TiO₂ layer is higher than those of amorphous SiO₂ and SnO₂ layers. According to the measurements of photoluminescence lifetime, surface photocurrent density, charge-transfer resistance, and electron spin resonance spectroscopy, it is revealed that the amorphous layer can prevent the migration of photogenerated electrons and holes onto the surface, decreasing the densities of surface electron and hole, and thereby suppress the photocatalytic activity.

关键词: TiO₂ pigments, Pulsed chemical vapor deposition, Ultrathin layer, Weatherability, Lightening power, Photocatalytic suppression mechanism

Yangyang Yu, Kejing Wu, Shiyu Lu, Kui Ma, Shan Zhong, Hegui Zhang, Yingming Zhu, Jing Guo, Hairong Yue, Changjun Liu, Siyang Tang, Bin Liang. Engineering an ultrathin amorphous TiO₂ layer for boosting the weatherability of TiO₂ pigment with high lightening power[J]. Chinese Journal of Chemical Engineering, 2019, 27(11): 2825-2834.

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Engineering an ultrathin amorphous TiO₂ layer for boosting the weatherability of TiO₂ pigment with high lightening power

Engineering an ultrathin amorphous TiO₂ layer for boosting the weatherability of TiO₂ pigment with high lightening power

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