Электронный каталог

Статья

Shilova, O.A.
Surface and Photocatalytic Properties of Sol-Gel Derived TiO&sub(2)@SiO&sub(2) Core-Shell Nanoparticles / O.A.Shilova, Yu.E.Gorshkova, [a.o.] // Journal of Sol-Gel Science and Technology [Electronic resource]. – 2023. – Vol. 108, No. 2. – P. 263-273. – URL: https://doi.org/10.1007/s10971-022-05943-5. – Bibliogr.: 32.

The surface of TiO&sub(2) nanoparticles was modified with silica prepared by acid hydrolysis of tetraethoxysilane followed by polycondensation. A comparative characterization of the initial and modified nanoparticles by TEM, XRD, specific surface area and ζ-potential measurements as well as the estimation of the surface acid-base properties via dynamic pH measurements revealed that the applied surface modification provided almost no changes in the phase composition, crystallite size range (~16 nm) and mesostructure of the initial anatase nanoparticles, but resulted in a more than twofold increase in the specific surface area and change of the surface functionality from a prominent Lewis acidity toward a relatively weak Broensted acidity. The resulting TiO&sub(2)@SiO&sub(2) “core-shell” particles are shown to exhibit a significant enhancement of singlet oxygen generation compared with the initial TiO&sub(2). In conjunction with increased specific surface and modification of the surface centers, this effect promoted a drastic growth of photocatalytic activity indicated by an almost 90% degradation of methylene blue dye upon UV irradiation.



ОИЯИ = ОИЯИ (JINR)2023
Спец.(статьи,препринты) = С 33 а - Нанофизика. Нанотехнология$
Спец.(статьи,препринты) = С 349.1 - Действие излучения на материалы$
Бюллетени = 15/024