[Preparation of nanoparticles-modified silica monolith for on-column surface enhanced Raman spectroscopy].

2014 
A novel silica monolith modified with Ag/Au nanoparticles was prepared for the on-column surface enhanced Raman spectroscopy(SERS).The bare monolithic silica column was prepared from in-situ co-condensation of tetraethoxysilane(TMOS)and methyl trimethoxysilane(MTMS)in the presence of polyethylene glycol(PEG)viaa sol-gel process in the capillary,and was chemically modified with(3-mercaptopropyl)trimethoxysilane(MTPMS),followed by immobilization of Ag/Au nanoparticles.Transmission electron microscopy(TEM)and UV-Vis spectrometer were used to collect the TEM images and the extinction spectra of the nanoparticles colloid,respectively.Scanning electron microscope(SEM)was utilized to record the morphology of the silica monolith.The authros used p-aminothiophenol(PATP)as a probing molecule,and the SERS effect was investigated on Au/Ag nanoparticle-modified silica monolith under the excitation line of 633and 532nm,respectively.It is concluded that nanoparticle-modified silica monoliths will have broad application to the on-site detection of food and water contaminants in the field.
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