論文

査読有り
2001年

Fast, reversible optical sensing of NO2 using 5,10,15,20-tetrakis[3,4-bis(2-ethylhexyloxy)phenyl]-21H,23H-porphine assemblies

JOURNAL OF MATERIALS CHEMISTRY
  • CM Dooling
  • ,
  • O Worsfold
  • ,
  • TH Richardson
  • ,
  • R Tregonning
  • ,
  • MO Vysotsky
  • ,
  • CA Hunter
  • ,
  • K Kato
  • ,
  • K Shinbo
  • ,
  • F Kaneko

11
2
開始ページ
392
終了ページ
398
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1039/b006342h
出版者・発行元
ROYAL SOC CHEMISTRY

The optical absorbance spectrum of LB film assemblies of 5,10,15,20-tetrakis[3,4-bis(2-ethylhexyloxy)phenyl]-21H,23H-porphine (EHO) is highly sensitive to low concentrations of NO2 in nitrogen. LB films prepared at much faster than conventional deposition rates (similar to 1000 mm min(-1)) yield t(50) response and recovery times of 25 s and 33 s respectively and show a sensitivity of 60% relative absorbance change (at 430 nm) for 4.4 ppm NO2. The morphology of these films is revealed using atomic force microscopy to contain isolated micron-size domains which are themselves composed of grains of several nm in diameter. This unconventional structure leads to a useful sensing material as a result of the molecular functionality of the porphyrin coupled to the enhanced surface area of the porous film assembly. The EHO film shows a gradually diminishing optical response as its temperature is increased, resulting from the shift in the adsorption-desorption equilibrium towards desorption as expected. The UV-visible spectrum recovers fully after exposure to NO2. The rate of recovery is slow at room temperature but can be accelerated dramatically with gentle heating (similar to 350 K) for a few seconds. The concentration dependence of the optical response over the range 0.8-4.4 ppm follows a Langmuir model.

リンク情報
DOI
https://doi.org/10.1039/b006342h
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000167139700029&DestApp=WOS_CPL
ID情報
  • DOI : 10.1039/b006342h
  • ISSN : 0959-9428
  • Web of Science ID : WOS:000167139700029

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