Synthesis and IR Vibrational Spectrum on GaN Nanocrystalline Prepared by Sol-gel Method

High quality GaN nanocrystalline has been prepared by sol-gel method. The results of X-ray diffraction (XRD), Selected-area electron diffraction (SAED) and High-resolution transmission electron microscopy (HRTEM) measurement indicate that as-prepared sample is single crystalline GaN with wurtzite structure. Transmission electron microscopy (TEM) displays that the diameters of the grains of GaN nanocrystalline change from 30nm to 100nm. X-ray photoelectron spectroscopy (XPS) confirms the formation of the bond between Ga and N in the sample, and IR spectrum measurement showed El (TO) vibrational modes at 510cm⁻¹• Vibrational frequency of GaN small clusters has been calculated using Density functional theory (DFT). Using the result, IR spectrum of the sample has been analyzed further.