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Use of Surface-Enhanced Raman Spectroscopy in Inorganic Syntheses for an Upper-Level Exploratory Lab
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Abstract
The guided synthesis and partial characterization of Ag and Au nanoparticles using UV–vis and surface-enhanced Raman spectroscopies (SERS) is described in this article. The experiment asks students to search literature for a synthetic preparation for Au and Ag nanoparticles, for organic molecules to adsorb to the nanoparticles, and for routes to characterize their nanoparticles and nanoparticles conjugates. After successful synthesis as determined by UV–vis absorption peaks has been achieved, students bind organic molecules (ones in which literature has proven to bind to Au and Ag nanoparticles) to the nanoparticles in solution. Once binding has been determined via a slight shift in the original nanoparticles' UV–vis absorption peak, students determine SERS activity through use of a modular Raman system that uses a 514.5-nm Ar+ laser. The experiment may be modified depending on instructor preference to focus on one of three areas: inorganic syntheses (Au and Ag nanoparticles), investigating the site through which functional groups of organic molecules bind, or investigating enhancement factors of different metallic nanoparticles by SERS. These studies can be achieved within five to six, three-hour laboratory periods.
Keywords (Audience):
Upper-Division UndergraduateKeywords (Domain):
Analytical ChemistryKeywords (Subject):
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- Received: August 03, 2009
ACS
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