Study of High Temperature Thermal Behavior of Alkyl and   Perfluoroalkylsilane Molecules Self-Assembled on Titanium Oxide Nanoparticles
  We have studied high temperature thermal behavior of 1H, 1H, 2H, 2H-Perfluorooctyl-trichlorosilane (FOTS) and Octyltrichlorosilane (OTS) molecules self assembled on titanium dioxide (TiO2) nanoparticles using advanced microscopy and spectroscopy technique such as Scanning Electron Microscope (SEM), Dynamic Light Scattering (DLS), X-Ray Diffraction (XRD) and Fourier Transform Infrared Spectroscopy (FTIR). FOTS SAM and OTS SAM coated TiO2 nanoparticles were heated to different temperature range from room temperature (RT) to 550oC. We characterized nano-microstructure and size distribution of FOTS SAM and OTS SAM coated TiO2 nanoparticles, which were heat-treated to different peak temperatures, using SEM and DLS techniques. The thermal stability and degradation of FOTS SAM and OTS SAM coated TiO2 were carried out using FTIR spectroscopy. We found that FOTS SAM on TiO2 is very stable up to 450oC and OTS on TiO2 is stable up to 250oC. Peak frequency, peak intensity and full width half maxima (FWHM) of symmetric and asymmetric CF2 and CH2 confirms our observation. In this study, we successfully synergized the surface and temperature sensitive characteristics of FOTS/OTS SAM and TiO2 nanoparticles in order to use them for highly demanding surface and temperature sensitive nanotechnology applications 
P. Prakash, U. Satheesh and D. Devaprakasam
cond-mat.mtrl-sci physics.atm-clus physics.chem-ph