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Analyst

Title:		Cyanide SERS as a platform for detection of volatile organic compounds and hazardous transition metal ions
Author(s):		Kim K; Lee JW; Shin KS;
Address:		"Department of Chemistry, Seoul National University, Seoul 151-742, Korea. kwankim@snu.ac.kr"
Journal Title:		Analyst
Year:		2013
Volume:		138
Issue:		10
Page Number:		2988 - 2994
DOI:		10.1039/c3an00105a
ISSN/ISBN:		1364-5528 (Electronic) 0003-2654 (Linking)
Abstract:		"It is demonstrated herein that cyanide adsorbed on nanostructured Au is a very useful system for the detection of not only volatile organic compounds (VOCs) but also transition metal ions by means of surface-enhanced Raman scattering (SERS). This technique exploits the susceptibility of the CN stretching frequency of cyanide on Au to the variation of the surface potential of the Au nanostructures that occurs in response to the adsorption of VOCs onto these surfaces. It also exploits the susceptibility to the binding of transition metal cations to the pendant nitrogen atom, which reduces the anti-bonding character of the nitrogen lone pair of electrons. The CN stretching band was illustrated to undergo a blue-shift by up to 20 cm(-1) in response to a typical biogenic VOC farnesol, whereas the band was red-shifted by 10 cm(-1) in response to the typical biogenic VOC (+)-alpha-pinene. This method is considered to be highly sensitive given that the peak shift of 2 cm(-1) could be reproducibly measured even at a partial pressure of 1 Pa, corresponding to 76 ppm of farnesol. The CN stretching band was also demonstrated to undergo a blue-shift by up to 60-64 cm(-1) in the presence of trivalent cations such as Fe(3+) and Cr(3+), whereas the band was blue-shifted by 26-35 cm(-1) in the presence of divalent metal ions such as Mn(2+) and Fe(2+). The present SERS method is regarded as very promising because transition metal ions were detectable at concentration levels as low as 1 fM"
Keywords:		"Ions/analysis Spectrum Analysis, Raman Surface Properties Transition Elements/*analysis Volatile Organic Compounds/*analysis;"
Notes:		"MedlineKim, Kwan Lee, Ji Won Shin, Kuan Soo eng Research Support, Non-U.S. Gov't England 2013/04/05 Analyst. 2013 May 21; 138(10):2988-94. doi: 10.1039/c3an00105a"