Template-free synthesis of organically modified silica mesoporous thin films for TNT sensing
Author
Yildirim, A.
Budunoglu, H.
Deniz, H.
Güler, Mustafa O.
Bayındır, Mehmet
Date
2010Source Title
ACS Applied Materials and Interfaces
Print ISSN
1944-8252
Publisher
American Chemical Society
Volume
2
Issue
10
Pages
2892 - 2897
Language
English
Type
ArticleItem Usage Stats
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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 quenchingmesoporous 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/11693/22165Published Version (Please cite this version)
http://dx.doi.org/10.1021/am100568cCollections
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