Detection of Anions by Normal Raman Spectroscopy and Surface-Enhanced Raman Spectroscopy of Cationic-Coated Substrates

Authors: Mosier-Boss, P.A.; Lieberman, S.H.

Source: Applied Spectroscopy, Volume 57, Issue 9, Pages 259A-279A and 1053-1199 (September 2003) , pp. 1129-1137(9)

Publisher: Society for Applied Spectroscopy

Key:
Free Content - Free Content
New Content - New Content
Subscribed Content - Subscribed Content
Free Trial Content - Free Trial Content

Abstract:

The use of normal Raman spectroscopy and surface-enhanced Raman spectroscopy (SERS) of cationic-coated silver and gold substrates to detect polyatomic anions in aqueous environments is examined. For normal Raman spectroscopy, using near-infrared excitation, linear concentration responses were observed. Detection limits varied from 84 ppm for perchlorate to 2600 ppm for phosphate. In general, detection limits in the ppb to ppm concentration range for the polyatomic anions were achieved using cationic-coated SERS substrates. Adsorption of the polyatomic anions on the cationic-coated SERS substrates was described by a Frumkin isotherm. The SERS technique could not be used to detect dichromate, as this anion reacted with the coatings to form thiol esters. A competitive complexation method was used to evaluate the interaction of chloride ion with the cationic coatings. Hydrogen bonding and π-π interactions play significant roles in the selectivity of the cationic coatings.

Keywords: SURFACE-ENHANCED RAMAN SPECTROSCOPY; SERS; CATIONIC THIOLS; POLYATOMIC ANIONS.

Document Type: Research article

DOI: 10.1366/00037020360695991

The full text electronic article is available for purchase. You will be able to download the full text electronic article after payment.

$29.00 plus tax      Refund Policy

 

OR

Back to top

Key:
Free Content - Free Content
New Content - New Content
Subscribed Content - Subscribed Content
Free Trial Content - Free Trial Content
Share this item with others: These icons link to social bookmarking sites where readers can share and discover new web pages.
Page Help Click here for Page Help
Shopping cart
Tools
Sign in






Need to register?
Sign up here
Text size: A | A | A | A