Optics: measuring and testing – By dispersed light spectroscopy
Reexamination Certificate
2007-06-25
2010-10-05
Geisel, Kara E (Department: 2877)
Optics: measuring and testing
By dispersed light spectroscopy
Reexamination Certificate
active
07808632
ABSTRACT:
Method and material for spectroscopic detection of organic chemicals. The material is a substantially optically transparent solid, such as ZnS, having a high surface area for adsorption of an analyte, such as organic chemical vapors. The solid material preferably has metal nanoparticles, such as gold, silver or copper nanoparticles, deposited on the surface for signal enhancement. A template compound, such as cetyl trimethyl ammonium bromide and alkoxylate block polymers, may be used during the material synthesis, such as reacting zinc chloride and sodium sulfide in the presence of the template compound, and later removed through calcination and washing to achieve the high surface area. The method of use includes collecting an analyte on the material and detecting the spectroscopic response of the analyte while it is collected on the surface. The mechanism of collection may include adsorbing, absorbing, and preconcentrating. Preferably, the spectroscopic response is selected from infrared spectra or ultraviolet-visible spectra.
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Drechsler Ulf Werner
Vaidya Bikas
Geisel Kara E
Lynntech Inc.
Streets Jeffrey L.
Streets & Steele
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