Informace o publikaci
Microtron-induced surface defects and phase transformations in anatase TiO2 colloidal nanoparticles
| Autoři | |
|---|---|
| Rok publikování | 2026 |
| Druh | Článek v odborném periodiku |
| Časopis / Zdroj | SURFACES AND INTERFACES |
| Fakulta / Pracoviště MU | |
| Citace | |
| www | https://www.sciencedirect.com/science/article/pii/S2468023025024472?pes=vor&utm_source=clarivate&getft_integrator=clarivate |
| Doi | https://doi.org/10.1016/j.surfin.2025.108199 |
| Klíčová slova | Ligand pair strategy; Oleic acid-oleylamine capping; Microtron irradiation; Surface defects; Phase transformation; TiO2 colloidal nanoparticles |
| Popis | Ultrasmall TiO2 colloidal nanoparticles (2-5 nm) were synthesized by ligand-assisted thermal decomposition and subsequently exposed to extreme-dose 16.5 MeV microtron electrons for 0-80 min, delivering absorbed doses of 23-171 MGy. Despite the unusually high irradiation levels, high-resolution TEM showed that the crystalline core size remained constant at 3.0-3.6 nm, while rutile nanodomains nucleated after >= 10 min, evidencing a localized anatase -> rutile transformation decoupled from particle growth. X-ray photoelectron spectroscopy recorded a transient increase and eventual depletion of Ti3+ surface species (0.074 -> < 0.005), accompanied by an indirect band-gap contraction from 3.30 to 2.50 eV. Dynamic light scattering revealed only minor aggregation, and the dispersions possessed promising colloidal stability. These findings demonstrate that multi-MGy microtron irradiation can simultaneously engineer defects and trigger phase change in sub-5 nm oxide colloids without sintering - an irradiation window that, to the best of our knowledge, has not been systematically explored for TiO2 nanomaterials, where published electron-beam studies rarely exceed 1 MGy. The approach offers a single-step, post-synthetic route to tune the redox activity and optical properties of oxide nanomaterials while preserving their ultrasmall dimension. |