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    STUDIA PHYSICA - Issue no. 1 / 2012  
         
  Article:   STRUCTURAL PROPERTIES OF POROUS COMPOSITES BASED ON TiO2 AND Ag NANOPARTICLES AND THEIR CAPABILITY TO DETECT WATER POLLUTANTS BY SERS.

Authors:  L. BAIA, M. BAIA. 		 
       
         
  Abstract:   Nanocomposites based on TiO2 loaded with Ag nanoparticles obtained via sol-gel method were investigated by means of Raman spectroscopy and sorption measurements. Furthermore, the detection capability of trace amounts of congo red and crystal violet molecules from aqueous solutions was also tested by employing Surface Enhanced Raman Spectroscopy (SERS). It was found that upon thermal treatment the crystallinity degree of the samples increases, the surface area and pore volumes decrease which explains the lower detection limits of the annealed samples. More exactly, in the case of untreated sample a concentration of 10-7 M for crystal violet and 10-5 M for congo red was detected, while after thermal treatment the less porous samples led to the detection of 10-5 M for crystal violet and 10-4 M for congo red.

Keywords: nanocomposites, Raman spectroscopy, sorption measurements, SERS, water pollutants.
 
         
     
         
         
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