Optical Properties of One Pot Synthesized Porous, Monodisperse, Size-Controlled Silica Particles: Effect of Tetra Alkoxysilane Addition Rate

Anjali Saini, Harshvardhan Negi, Avritti Srivastava, Sanjay K. Srivastava, Prathap Pathi, Mrinal Dutta

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

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.)

Original languageEnglish
Pages (from-to)2985-2996
Number of pages12
JournalSilicon
Volume16
Issue number7
DOIs
StatePublished - 1 May 2024
Externally publishedYes

Keywords

  • Optical properties
  • Photoluminescence
  • Porous
  • Semi-batch
  • Silica microparticles
  • Stöber method

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

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