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        Structural and optical properties of pulsed laser deposited ZnO thin films

        E. Fazio,S. Patanè,S. Scibilia,A.M. Mezzasalma,G. Mondio,F. Neri,S. Trusso 한국물리학회 2013 Current Applied Physics Vol.13 No.4

        Nanocrystalline ZnO thin films were grown by means of pulsed laser deposition. The ablation process was carried out at relatively low background oxygen gas pressure (10 Pa) and by varying the substrate temperature up to 600 C. Information on the structural and morphological properties of the deposited thin films have been obtained by means of X-ray photoelectron, Raman spectroscopies, X-ray diffraction (XRD) and atomic force microscopy (AFM). The results showed that all the deposited films are substoichiometric in oxygen and with a hexagonal wurtzite crystalline structure, characterized by features of some tens of nanometers in size. An improvement of the films’ crystalline quality was observed for the deposition temperature of 300 ℃ while the further increase of the deposition temperature up to 600℃ induces a worsening of the material’s structural properties with the development of a large amount of nanoparticle’s clusters. The analysis of the XRD patterns shows a growth crystallographic preferential direction as a function of the deposition temperature, in agreement with the appearance of the only E2 optical phonon mode in the Raman spectra. Such findings are compatible with the changes observed in the photoluminescent (PL) optical response and was related to the modification of the ZnO thin film structural quality.

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        Correlation between carbon nanotube microstructure and their catalytic efficiency towards the p-coumaric acid degradation

        E. Fazio,E. Piperopoulos,S.H. Abdul Rahim,M. Lanza,G. Faggio,G. Mondio,F. Neri,A.M. Mezzasalma,C. Milone,S. Santangelo 한국물리학회 2013 Current Applied Physics Vol.13 No.4

        Pristine and annealed multi-walled C nanotubes are preliminarily tested as catalysts towards the degradation of p-coumaric acid with better performances than the widely used activated carbon. In order to clarify the origin of their different catalytic efficiency, the samples are analysed by means of highresolution transmission electron microscopy, X-ray photoemission, reflection electron energy loss and micro-Raman spectroscopy. Chemical composition, mass density, bonding configurations and threefoldto fourfold-coordinated carbon bonding ratios are determined. The comparative discussion of the results obtained leads to attribute the higher catalytic activity of the pristine nanotubes to their larger sp2/sp3carbon bonding fraction and greater amount of oxygen containing functional groups

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