Synthesis of vacancy-rich titania particles suitable for the additive manufacturing of ceramics

被引：6

作者：

Benavides-Guerrero, Jaime A. ^{[1
]}

Gerlein, Luis Felipe ^{[1
]}

Trudeau, Charles ^{[1
]}

Banerjee, Debika ^{[1
]}

Guo, Xiaohang ^{[1
]}

Cloutier, Sylvain G. ^{[1
]}

机构：

[1] Ecole Technol Super, Dept Elect Engn, Montreal, PQ H3C 1K3, Canada

来源：

SCIENTIFIC REPORTS | 2022年 / 12卷 / 01期

基金：

加拿大自然科学与工程研究理事会;

关键词：

SINGLE OXYGEN VACANCIES; ANATASE TIO2; RAMAN-SCATTERING; BAND-GAP; PHOTOCATALYTIC ACTIVITY; TEMPERATURE-DEPENDENCE; OPTICAL-PROPERTIES; ELECTRON-TRANSFER; HEAT-TREATMENT; NANOPARTICLES;

D O I：

10.1038/s41598-022-19824-y

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

In the last decades, titania (or TiO2) particles played a crucial role in the development of photo-catalysis and better environmentally-friendly energy-harvesting techniques. In this work, we engineer a new generation of TiO2 particles rich in oxygen vacancies using a modified sol-gel synthesis. By design, these vacancy-rich particles efficiently absorb visible light to allow carefully-controlled light-induced conversion to the anatase or rutile crystalline phases. FTIR and micro-Raman spectroscopy reveal the formation of oxygen vacancies during conversion and explain this unique laser-assisted crystallization mechanism. We achieve low-energy laser-assisted crystallization in ambient environment using a modified filament 3D printer equipped with a low-power laser printhead. Since the established high-temperature treatment necessary to convert to crystalline TiO2 is ill-suited to additive manufacturing platforms, this work removes a major fundamental hurdle and opens whole new vistas of possibilities towards the additive manufacturing of ceramics, including carefully-engineered crystalline TiO2 substrates with potential applications for new and better photo-catalysis, fuel cells and energy-harvesting technologies.

引用

页数：11