4. a) Mention and describe the first method used for the synthesis of carbon nanotubes? (4) b) Numerous nanomaterials have been synthesized using Chemical Vapour Deposition (CVD) method. Mention five step mechanism that are involved in CVD process? (5) c) Describe and compare FTIR and Raman spectroscopy d) Discuss how the optical properties are measured using UV-VIS

Explain IR spectroscopy as a characterization technique.

Flame Atomic Absorption Spectroscopy (FAAS) method is selected due to its wide applicability for metal ion analysis in drinking water samples. Discuss how can we determine the concentration of selected heavy metals (Cu and Cr) in the unknown tap water sample.

Share Highlight Rotate Markup When XeFa was originally prepared a combination of IR and Raman spectroscopy was used to determine its geometric structure (nominal Dan VS Ta). The data showed three bands in the Raman and two bands in the IR (it was predicted that a third mode should have been observable, but it was too low in energy to be seen by the authors' instrumental set-up). a) Derive r3n for XeFa in Dan and Ta symmetries b) From F3n determine rvib for XeF4 in Dah and Ta symmetries c) Determine which normal modes are IR active and which are Raman active for XeFa in Dah and Ta symmetries d) Show that the experimental vibrational data is consistent with square planar XeF4