Abstract
In this report, Raman and Fourier Transform Infrared (FTIR) measurements were carried out to study the phonon modes of pure and Fe doped ZnO nanoparticles. The nanoparticles were prepared by sol–gel technique at room temperature. The X-ray diffraction measurements reveal that the nanoparticles are in hexagonal wurtzite structure and doping makes the shrinkage of the lattice parameters, whereas there is no alteration in the unit cell. Raman measurements show both \(E_{2}^{\mathrm{low}}\) and \(E_{2}^{\mathrm{High}}\) optical phonon mode is shifted towards lower wave number with Fe incorporation and explained on the basis of force constant variation, stress measurements, respectively. In addition, Fe related local vibrational modes (LVM) were observed for higher concentration of Fe doping. FTIR spectra reveal a band at 444 cm−1 which is specific to E 1 (TO) mode; a red-shift of this mode in Fe doped samples and some surface phonon modes were observed. Furthermore, the observation of additional IR modes, which is considered to have an origin related to Fe dopant in the ZnO nanostructures, is also reported. These additional mode features can be regarded as an indicator for the incorporation of Fe ions into the lattice position of the ZnO nanostructures.
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Acknowledgement
One of the author B. Karthikeyan would like to thank the Department of Science and Technology, Government of India, for sanctioning the fast track project (P.No. SR/FTP/PS-18/2008) to perform this study.
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Pandiyarajan, T., Udayabhaskar, R. & Karthikeyan, B. Role of Fe doping on structural and vibrational properties of ZnO nanostructures. Appl. Phys. A 107, 411–419 (2012). https://doi.org/10.1007/s00339-011-6755-8
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DOI: https://doi.org/10.1007/s00339-011-6755-8