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

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      Author
      Yildirim, A.
      Budunoglu, H.
      Deniz, H.
      Güler, Mustafa O.
      Bayındır, Mehmet
      Date
      2010
      Source Title
      ACS Applied Materials and Interfaces
      Print ISSN
      1944-8252
      Publisher
      American Chemical Society
      Volume
      2
      Issue
      10
      Pages
      2892 - 2897
      Language
      English
      Type
      Article
      Item Usage Stats
      123
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      142
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      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.
      Keywords
      fluorescence quenching
      mesoporous materials
      ORMOSIL
      thin films
      TNT detection
      Ambient conditions
      Fluorescence quenching
      Fluorescent molecules
      Gel networks
      Mesoporous
      Mesoporous thin films
      Methyltrimethoxysilane
      Organically modified silica
      ORMOSIL
      Porous film
      Sol-gel methods
      Spring back
      Template-free
      TNT detection
      Vapor Phase
      Coagulation
      Explosives detection
      Fluorescence
      Gelation
      Gels
      Quenching
      Silica
      Sol-gel process
      Thin films
      Vapors
      Mesoporous materials
      Permalink
      http://hdl.handle.net/11693/22165
      Published Version (Please cite this version)
      http://dx.doi.org/10.1021/am100568c
      Collections
      • Department of Physics 2299
      • Institute of Materials Science and Nanotechnology (UNAM) 1775
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