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7636841 
Journal Article 
Application of calixarene to high active surface-enhanced Raman scattering (SERS) substrates suitable for in situ detection of polycyclic aromatic hydrocarbons (PAHs) in seawater 
Kwon, YH; Sowoidnich, Kay; Schmidt, H; Kronfeldt, HD; , 
2012 
Yes 
Journal of Raman Spectroscopy
ISSN: 0377-0486 
WILEY-BLACKWELL 
HOBOKEN 
43 
8 
1003-1009 
English 
WOS:000307550100007 
The characteristics of the solgel matrix embedding Ag nanoparticles functionalized with 25,27-dimercaptoacetic acid-26,28-dihydroxy-4-tert-butylcalix[4]arene (DMCX) suitable for the in situ detection of polycyclic aromatic hydrocarbons (PAHs) in seawater is presented. The DMCX-functionalized silver nanoparticles were produced by the thermal reduction method in xerogel film. The silver colloid blocks were formed in the solgel matrix, with a diameter ranging from 50 to 120?nm. DMCX forming the monolayer on the silver nanoparticle surface contributes to the surface-enhanced Raman scattering (SERS) activity due to the aggregation of silver nanoparticles and the preconcentration of PAH molecules within the zone of electromagnetic enhancement. When selected, PAH molecules e.g. pyrene and naphthalene were adsorbed onto the SERS substrate; Raman band positions of PAH were slightly shifted. A calibration procedure reveals that this type of SERS substrate has a limit of detection of 3?x?10-10?mol/l for pyrene and 13?x?10-9?mol/l for naphthalene in artificial seawater. The Raman signal response on a pyrene concentration change in artificial seawater was evaluated using a 671-nm Raman setup with a flow-through cell. This type of SERS substrate will be suitable for the in situ trace detection of pollutant chemicals in seawater. Copyright (c) 2012 John Wiley & Sons, Ltd. 
DMCX; PAHs; seawater; SERS; silver colloid