Surface-Enhanced Raman Scattering from Synergistic Contribution of Metal and Semiconductor in TiO2/MBA/Ag(Au) and Ag(Au)/MBA/TiO2 Assemblies
Citations Over TimeTop 10% of 2012 papers
Abstract
Traditional metal SERS-active substrate (Ag or Au) and novel semiconductor SERS-active substrate (TiO2) are combined into the composite system for their synergetic contribution to SERS. A series of assemblies with 4-mercaptobenzoic acid (4-MBA) molecule, TiO2, and/or Ag (Au) nanoparticles (NPs) have been fabricated by a self-assembly method. In the sandwich-structure assemblies (TiO2/MBA/Ag(Au) and Ag(Au)/MBA/TiO2), the SERS signals of 4-MBA molecule exhibit obvious difference in not only the intensity but also Raman frequency as compared with that SERS enhancement in the TiO2/MBA, which is attributed to the introduce of metals and its interaction/synergistic action with TiO2 NPs. SERS enhancement behaviors of 4-MBA in the sandwich-structure assemblies strongly depend on the natures of metals and 4-MBA molecule, which can result in a influence on the TiO2-to-molecule charge transfer and consequent additional EM field effect. This work would like to be interesting and of considerable value for both theory development and practice application of SERS technology.
Related Papers
- Handbook of Raman Spectroscopy: From the Research Laboratory to the Process Line(2001)
- → Defects in Individual Semiconducting Single Wall Carbon Nanotubes: Raman Spectroscopic and in Situ Raman Spectroelectrochemical Study(2010)103 cited
- → Raman spectroscopy of carbon nanohoops(2013)78 cited
- → UV Raman Spectroscopy of Single-Walled Carbon Nanotubes(2001)25 cited
- → The effect of aqueous solution in Raman spectroscopy(2009)3 cited