TY - JOUR
T1 - Optical Properties of One Pot Synthesized Porous, Monodisperse, Size-Controlled Silica Particles
T2 - Effect of Tetra Alkoxysilane Addition Rate
AU - Saini, Anjali
AU - Negi, Harshvardhan
AU - Srivastava, Avritti
AU - Srivastava, Sanjay K.
AU - Pathi, Prathap
AU - Dutta, Mrinal
N1 - Publisher Copyright:
© The Author(s), under exclusive licence to Springer Nature B.V. 2024.
PY - 2024/5/1
Y1 - 2024/5/1
N2 - A semi-batch process was used to produce porous silica particles with a narrow size distribution of size range 0.79- 2.51 µm by injecting an ethanolic solution of tetraethyl orthosilicate (TEOS) in a controlled manner in the Stöber process without adding any stabilizer, surfactant or porogen. The growth mechanism was found to be dominated by interface reactions and diffusion-limited processes based on the rate of addition of TEOS. The presence of water, ethanol, and ammonia on the surface of these silica particles was predicted by FTIR and TG analysis. The silica particles were found to be surrounded by a thin shell with an average pore size of 5.8 nm. The presence of E' centers and oxygen-deficient centers (ODCs) was confirmed by absorption spectra. The ultraviolet, blue, green, and red bands of the broad-range photoluminescence (PL) resulted from the radiative relaxation of ODCs, self-trapped excitons, surface hydrogen-related-species, and the bulk-surface nonbridging-oxygen-hole centers respectively, that were excited through non-radiative relaxation of free excitons produced by the two-photon process. Graphical Abstract: (Figure presented.)
AB - A semi-batch process was used to produce porous silica particles with a narrow size distribution of size range 0.79- 2.51 µm by injecting an ethanolic solution of tetraethyl orthosilicate (TEOS) in a controlled manner in the Stöber process without adding any stabilizer, surfactant or porogen. The growth mechanism was found to be dominated by interface reactions and diffusion-limited processes based on the rate of addition of TEOS. The presence of water, ethanol, and ammonia on the surface of these silica particles was predicted by FTIR and TG analysis. The silica particles were found to be surrounded by a thin shell with an average pore size of 5.8 nm. The presence of E' centers and oxygen-deficient centers (ODCs) was confirmed by absorption spectra. The ultraviolet, blue, green, and red bands of the broad-range photoluminescence (PL) resulted from the radiative relaxation of ODCs, self-trapped excitons, surface hydrogen-related-species, and the bulk-surface nonbridging-oxygen-hole centers respectively, that were excited through non-radiative relaxation of free excitons produced by the two-photon process. Graphical Abstract: (Figure presented.)
KW - Optical properties
KW - Photoluminescence
KW - Porous
KW - Semi-batch
KW - Silica microparticles
KW - Stöber method
UR - http://www.scopus.com/inward/record.url?scp=85185120536&partnerID=8YFLogxK
U2 - 10.1007/s12633-024-02899-9
DO - 10.1007/s12633-024-02899-9
M3 - Article
AN - SCOPUS:85185120536
SN - 1876-990X
VL - 16
SP - 2985
EP - 2996
JO - Silicon
JF - Silicon
IS - 7
ER -