Raman spectroscopy, a sensitive probe to the local atomic arrangements and vibrations of the materials, has also been widely used to investigate the microstructural nature of the nanosized materials in general and CuO nanomaterial in particular. Raman scattering also provides valuable information about the structures and bonds of materials. Raman scattering could help detect unintended phases such as Cu2O or Cu(OH)2 or show the crystallinity of the product. The space group of CuO has two molecules per primitive cell, so the zone center Raman active normal modes of CuO are. Among these vibration modes are three acoustic modes, six infrared active modes (3Au + 3Bg), and three Raman operational modes (Ag + 2Bg). Three well-known bands of CuO are Ag (296 cm−1), (346 cm−1), and (631 cm−1)—Raman spectra of CuO nanostructures prepared by microwave irradiation method with three typical modes. Xu et al. studied Raman spectra of CuO nanocrystals with different grain sizes at room temperature and high temperatures up to 873 K. They reported that Raman intensity is related to grain size. Samples of smaller grain size show stronger and sharper Raman peaks which also shift to smaller wavenumbers. The phonon confinement effect in nanometer-size materials could explain the redshifts. It should be noted that crystal defects, of which the number increases rapidly as the grain size decreases due to the large surface/volume ratio, could contribute significantly to Raman spectra as all of the three Raman modes in CuO relate only to the vibration of oxygen atoms as was pointed out by Irwin and Wei. If you are looking for high quality, high purity, and cost-effective copper oxide, or if you require the latest price, please email contact mis-asia.