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      Smelling in chemically complex environments: an optofluidic bragg fiber array for differentiation of methanol adulterated beverages

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      Author
      Yildirim, A.
      Ozturk, F. E.
      Bayındır, Mehmet
      Date
      2013
      Source Title
      Analytical Chemistry
      Print ISSN
      0003-2700
      Publisher
      American Chemical Society
      Volume
      85
      Issue
      13
      Pages
      6384 - 6391
      Language
      English
      Type
      Article
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      Abstract
      A novel optoelectronic nose for analysis of alcohols (ethanol and methanol) in chemically complex environments is reported. The cross-responsive sensing unit of the optoelectronic nose is an array of three distinct hollow-core infrared transmitting photonic band gap fibers, which transmit a specific band of IR light depending on their Bragg mirror structures. The presence of alcohol molecules in the optofluidic core quenches the fiber transmissions if there is an absorption band of the analyte overlapping with the transmission band of the fiber; otherwise they remain unchanged. The cumulative response data of the fiber array enables rapid, reversible, and accurate discrimination of alcohols in chemically complex backgrounds such as beer and fruit juice. In addition, we observed that humidity of the environment has no effect on the response matrix of the optoelectronic nose, which is rarely achieved in gas-sensing applications. Consequently, it can be reliably used in virtually any environment without precalibration for humidity or drying the analytes. Besides the discussed application in counterfeit alcoholic beverages, with its superior sensor parameters, this novel concept proves to be a promising contender for many other applications including food quality control, environmental monitoring, and breath analysis for disease diagnostics. © 2013 American Chemical Society.
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      http://hdl.handle.net/11693/20902
      Published Version (Please cite this version)
      http://dx.doi.org/10.1021/ac4008013
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      • Department of Physics 2331
      • Institute of Materials Science and Nanotechnology (UNAM) 1841
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