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Synthesis and thermal stability of ZnO nanowires

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Abstract

ZnO nanowires (NWs) were synthesized on Au-coated Si (100) substrates by vapor transport method. The effect of high temperature annealing on the structural and chemical composition as well as thermal stability was studied. The as-prepared ZnO NWs was nearly stoichiometric and identified as hexagonal ZnO phase. After annealing at 1,473 K, the atomic ratio of O/Zn, the intensity of the diffraction peaks, and the diameter of nanowires were increased. The ZnO NWs were fragmented into nanocrystals and the fragments coalesced with each other after annealing at 1,673 K. The thermal stability of ZnO NWs was studied by thermo-gravimetric (TG) analysis. A sharp increase in the TG curves was observed and can be attributed to the oxidation of some possibly presented Zn atoms. The activation energy of oxidation of Zn interstitial atoms was found to be 484.81 kJ mol−1. A mass gain peak was observed after annealing at 1,473 K, but it was completely eliminated after annealing at 1,673 K.

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Authors and Affiliations

  1. Physics Department, Faculty of Science, Sohag University, Sohag, 82524, Egypt

    Madeha Ahmed Awad, Eslam Mohamed Mohamed Ibrahim & Ahmed Mohamed Ahmed

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  1. Madeha Ahmed Awad
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  2. Eslam Mohamed Mohamed Ibrahim
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  3. Ahmed Mohamed Ahmed
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Correspondence to Madeha Ahmed Awad.

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Awad, M.A., Ibrahim, E.M.M. & Ahmed, A.M. Synthesis and thermal stability of ZnO nanowires. J Therm Anal Calorim 117, 635–642 (2014). https://doi.org/10.1007/s10973-014-3836-x

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