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Distorted Ultrasmall TiO2 Nanoparticles as Efficient Visible Light Photocatalyst.
Ardiansyah Taufik1, Akira Yoko1,2, Kakeru Ninomiya2,3
1WPI - Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, Sendai, Miyagi, Japan.
Small (Weinheim an Der Bergstrasse, Germany)
|April 8, 2026
Summary
Researchers developed ultrasmall, 2nm titanium dioxide (TiO2) nanoparticles for efficient visible light photocatalysis. This novel material shows significantly enhanced NOx removal activity, offering a new path for advanced nanomaterials.
Area of Science:
- Materials Science
- Nanotechnology
- Environmental Chemistry
Background:
- Developing efficient and cost-effective visible light photocatalysts is crucial.
- Titanium dioxide (TiO2) has limitations including a wide bandgap and small surface area.
Purpose of the Study:
- To synthesize visible light-active ultrasmall (approximately 2 nm) TiO2 nanoparticles.
- To overcome the limitations of conventional TiO2 for photocatalysis.
Main Methods:
- Continuous flow-hydrothermal synthesis with precise temperature control and sub-second reaction time.
- Direct synthesis of ultrasmall TiO2 nanoparticles, avoiding post-annealing growth.
Main Results:
- Ultrasmall (approximately 2 nm) TiO2 nanoparticles with a highly distorted lattice structure were obtained.
- High lattice distortion, including undercoordinated Ti atoms, created localized states that narrowed the bandgap.
- The synthesized TiO2 demonstrated nearly threefold higher photocatalytic activity for NOx removal under visible light.
Conclusions:
- Ultrasmall TiO2 nanoparticles synthesized via continuous flow-hydrothermal process exhibit enhanced visible light photocatalytic activity.
- Lattice distortion in ultrasmall TiO2 is key to modifying band structure and improving performance.
- This work opens new avenues for designing ultrasmall oxide nanomaterials for next-generation photocatalysis.
