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	High-performance TNT chemosensory materials based on nanocomposites with bimodal porous structures
	Shengyang Tao ; Jinxiang Yin ; Guangtao Li
	2010-10-12 ; 2010-10-12
关键词	Experimental/ chemical sensors colloidal crystals gas sensors mesoporous materials nanocomposites organic compounds permeability radiation quenching silicon compounds surfactants thin films/ TNT chemosensory materials bimodal porous structures porphyrin metalloporphyrin-doped silica films polystyrene spheres surfactant structure-directing agents explosive vapour 2,4,6-trinitrotoluene 2,4-dinitrotoluene nitrobenzene macropores mesopores molecule permeability interaction site density fluorescence response capability fluorescence quenching efficiency conjugated- polymer based TNT sensor materials toluene washing hybrid films fluorescence-based sensory materials nitroaromatics organic sensing elements inorganic matrices mesostructured nanocomposite colloidal crystal film SiO/sub 2// A8280T Chemical sensors A8116 Methods of nanofabrication and processing A8270D Colloids A6140G Structure of powders and porous materials A8115 Methods of thin film deposition B7230L Chemical sensors/ SiO2/int O2/int Si/int O/int SiO2/bin O2/bin Si/bin O/bin
中文摘要	A series of porphyrin or metalloporphyrin-doped silica films with bimodal porous structures were successfully fabricated using polystyrene spheres and a surfactant (CTAB) as structure-directing agents, and examined for chemosensory applications to detect trace amounts of vapours of explosives such as TNT (2,4,6-trinitrotoluene), DNT (2,4-dinitrotoluene) and NB (nitrobenzene). The obtained results clearly show that an appropriate combination of macropores and mesopores can achieve high molecule permeability and high density of interaction sites (sensing elements-analyte). As a result, silica films with bimodal porous structures exhibit much more efficient fluorescence response capability than single modal porous films. Films with extremely high fluorescence quenching efficiency towards TNT (10 ppb), close to 55% after 10 s of exposure, were achieved, which is nearly double those of conjugated- polymer based TNT sensor materials. Using toluene washing, the sensory properties of the constructed films can be easily recovered. Besides the remarkable TNT detecting capability, these hybrid films have several advantages over other fluorescence-based sensory materials, such as a simple preparation approach, inexpensive materials, recognition ability of different nitroaromatics as well as stability of organic sensing elements in inorganic matrices. These results suggest that this new kind of mesostructured nanocomposite is a potentially useful chemosensory material for rapidly detecting trace explosives.
语种	英语
出版者	Royal Society of Chemistry ; UK
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/80839]
专题	清华大学
推荐引用方式 GB/T 7714	Shengyang Tao,Jinxiang Yin,Guangtao Li. High-performance TNT chemosensory materials based on nanocomposites with bimodal porous structures[J],2010, 2010.
APA	Shengyang Tao,Jinxiang Yin,&Guangtao Li.(2010).High-performance TNT chemosensory materials based on nanocomposites with bimodal porous structures..
MLA	Shengyang Tao,et al."High-performance TNT chemosensory materials based on nanocomposites with bimodal porous structures".(2010).

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