Nanocomposite material for direct spectroscopic detection of chemical vapors
US7808632B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 25, 2007 |
| Grant date | Oct 5, 2010 |
| Priority date | — |
| Expiry date | Jan 25, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/3504
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.