Template-free synthesis of organically modified silica mesoporous thin films for TNT sensing

Adem Yildirim, Hulya Budunoglu, Hakan Deniz, Mustafa O. Guler, Mehmet Bayindir

Research output: Contribution to journalArticle

29 Scopus citations

Abstract

In this paper, we present a facile, template-free sol-gel method to produce fluorescent and highly mesoporous organically modified silica (ORMOSIL) thin films for vapor phase sensing of TNT. An alkyltrifunctional, methyltrimethoxysilane MTMS precursor was used to impart hydrophobic behavior to gel network in order to form the spring back effect. In this way, porous films (up to 74% porosity) are obtained at ambient conditions. Fluorescent molecules are physically encapsulated in the ORMOSIL network during gelation. Fluorescence of the films was found to be stable even after 3 months, proving the successful fixing of the dye into the ORMOSIL network. The functional ORMOSIL thin films exhibited high fluorescence quenching upon exposition to TNT and DNT vapor. Fluorescence quenching responses of the films are thickness-dependent and higher fluorescence quenching efficiency was observed for the thinnest film (8.6% in 10 s). The prepared mesoporous ORMOSIL thin films have great potential in new sensor and catalysis applications.

Original languageEnglish (US)
Pages (from-to)2892-2897
Number of pages6
JournalACS Applied Materials and Interfaces
Volume2
Issue number10
DOIs
StatePublished - Oct 27 2010

Keywords

  • ORMOSIL
  • TNT detection
  • fluorescence quenching
  • mesoporous materials
  • thin films

ASJC Scopus subject areas

  • Materials Science(all)

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