Microtron-induced surface defects and phase transformations in
anatase TiO2 colloidal nanoparticles

J 2026

Microtron-induced surface defects and phase transformations in anatase TiO2 colloidal nanoparticles

THELAPPURATH, Aiswarya Vijayakumar; Zuzana SISKA; Sanjay Gopal ULLATTIL; Lucie ŠIMONÍKOVÁ; Nadezda PIZUROVA et al.

Základní údaje

Originální název

Microtron-induced surface defects and phase transformations in anatase TiO2 colloidal nanoparticles

Autoři

THELAPPURATH, Aiswarya Vijayakumar; Zuzana SISKA; Sanjay Gopal ULLATTIL; Lucie ŠIMONÍKOVÁ a Nadezda PIZUROVA

Vydání

SURFACES AND INTERFACES, AMSTERDAM, ELSEVIER, 2026, 2468-0230

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10403 Physical chemistry

Stát vydavatele

Nizozemské království

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Impakt faktor

Impact factor: 6.300 v roce 2024

Označené pro přenos do RIV

Ano

Organizační jednotka

Přírodovědecká fakulta

Klíčová slova anglicky

Ligand pair strategy; Oleic acid-oleylamine capping; Microtron irradiation; Surface defects; Phase transformation; TiO2 colloidal nanoparticles

Štítky

14313010, rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 19. 3. 2026 13:12, Mgr. Pavla Foltynová, Ph.D.

Anotace

V originále

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.

Citovat

THELAPPURATH, Aiswarya Vijayakumar; Zuzana SISKA; Sanjay Gopal ULLATTIL; Lucie ŠIMONÍKOVÁ a Nadezda PIZUROVA. Microtron-induced surface defects and phase transformations in anatase TiO2 colloidal nanoparticles. SURFACES AND INTERFACES. AMSTERDAM: ELSEVIER, 2026, roč. 80, JAN, s. 1-10. ISSN 2468-0230. Dostupné z: https://doi.org/10.1016/j.surfin.2025.108199.

@article{2561655,
   author = {Thelappurath, Aiswarya Vijayakumar and Siska, Zuzana and Ullattil, Sanjay Gopal and Šimoníková, Lucie and Pizurova, Nadezda},
   article_location = {AMSTERDAM},
   article_number = {JAN},
   doi = {https://doi.org/10.1016/j.surfin.2025.108199},
   keywords = {Ligand pair strategy; Oleic acid-oleylamine capping; Microtron irradiation; Surface defects; Phase transformation; TiO2 colloidal nanoparticles},
   language = {eng},
   issn = {2468-0230},
   journal = {SURFACES AND INTERFACES},
   title = {Microtron-induced surface defects and phase transformations in anatase TiO2 colloidal nanoparticles},
   url = {https://www.sciencedirect.com/science/article/pii/S2468023025024472?pes=vor&utm_source=clarivate&getft_integrator=clarivate},
   volume = {80},
   year = {2026}
}

TY  - JOUR
ID  - 2561655
AU  - Thelappurath, Aiswarya Vijayakumar - Siska, Zuzana - Ullattil, Sanjay Gopal - Šimoníková, Lucie - Pizurova, Nadezda
PY  - 2026
TI  - Microtron-induced surface defects and phase transformations in anatase TiO2 colloidal nanoparticles
JF  - SURFACES AND INTERFACES
VL  - 80
IS  - JAN
SP  - 1-10
EP  - 1-10
PB  - ELSEVIER
SN  - 24680230
KW  - Ligand pair strategy
KW  - Oleic acid-oleylamine capping
KW  - Microtron irradiation
KW  - Surface defects
KW  - Phase transformation
KW  - TiO2 colloidal nanoparticles
UR  - https://www.sciencedirect.com/science/article/pii/S2468023025024472?pes=vor&utm_source=clarivate&getft_integrator=clarivate
N2  - 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.
ER  -

THELAPPURATH, Aiswarya Vijayakumar; Zuzana SISKA; Sanjay Gopal ULLATTIL; Lucie ŠIMONÍKOVÁ a Nadezda PIZUROVA. Microtron-induced surface defects and phase transformations in anatase TiO2 colloidal nanoparticles. \textit{SURFACES AND INTERFACES}. AMSTERDAM: ELSEVIER, 2026, roč.~80, JAN, s.~1-10. ISSN~2468-0230. Dostupné z: https://doi.org/10.1016/j.surfin.2025.108199.

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