Phosphor-free silica-coating of monodisperse cores for dual functionalization with luminescent and mesoporous shell

Haruyuki Ishii, Shunsuke Kawai, Daisuke Nagao, Mikio Konno

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

To dually functionalize monodisperse cores with luminescence and mesopores, hydrolysis and condensation of tetraethyl orthosilicate in the presence of a double chain cationic surfactant of didodecyldimethylammonium bromide (DDAB) were applied to monodisperse silica cores with an average size smaller than 100 nm. Highly monodisperse core-shell particles were obtained by uniform coating of the cores with silica shell. Calcination of the silica shell at 500 °C to remove the incorporated DDAB surfactant provided the shells with mesoporous and luminescent properties without using any phosphors. The size of mesopores could be expanded by using dihexadecyldimethylammonium bromide (DHAB) with alkyl chains longer than DDAB. The combination of silica shell formation and calcination was also applied to monodisperse polymer cores, which created monodisperse, luminescent, hollow mesoporous silica particles (HMSs) with a sub-100 nm cavity inside. The emission intensity of mesoporous shell measured with an excitation wavelength of 365 nm could be sharply increased by an increase in the volume of mesoporous shell formed on the silica cores, implying that the luminescent centers derived from organic residue homogeneously distributed in the mesoporous shell.

Original languageEnglish
Pages (from-to)366-371
Number of pages6
JournalMicroporous and Mesoporous Materials
Volume241
DOIs
Publication statusPublished - 2017

Keywords

  • Double chain cationic surfactant
  • Dual functionalization
  • Mesoporous silica
  • Phosphor-free luminescence
  • Silica coating

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials

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