Vapor–Solid–Solid Growth Mechanism Driven by Epitaxial Match between Solid AuZn Alloy Catalyst Particles and ZnO Nanowires at Low Temperatures

Authors

  • Leonardo C. Campos,

    1. Laboratório de Nanomateriais, Departamento de Física Universidade Federal de Minas Gerais Av. Antônio Carlos 6627, 30123-970 Belo Horizonte MG (Brazil)
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  • Matteo Tonezzer,

    1. Laboratório de Nanomateriais, Departamento de Física Universidade Federal de Minas Gerais Av. Antônio Carlos 6627, 30123-970 Belo Horizonte MG (Brazil)
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  • Andre S. Ferlauto,

    1. Laboratório de Nanomateriais, Departamento de Física Universidade Federal de Minas Gerais Av. Antônio Carlos 6627, 30123-970 Belo Horizonte MG (Brazil)
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  • Vincenzo Grillo,

    1. TASC-INFM-CNR National Laboratory Area Science Park - BasoVizza Building MM, SS 14, Km 163.5, 34012 Trieste (Italy)
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  • Rogério Magalhães-Paniago,

    1. Laboratório de Nanomateriais, Departamento de Física Universidade Federal de Minas Gerais Av. Antônio Carlos 6627, 30123-970 Belo Horizonte MG (Brazil)
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  • Sergio Oliveira,

    1. Laboratório de Nanomateriais, Departamento de Física Universidade Federal de Minas Gerais Av. Antônio Carlos 6627, 30123-970 Belo Horizonte MG (Brazil)
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  • Luiz O. Ladeira,

    1. Laboratório de Nanomateriais, Departamento de Física Universidade Federal de Minas Gerais Av. Antônio Carlos 6627, 30123-970 Belo Horizonte MG (Brazil)
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  • Rodrigo G. Lacerda

    Corresponding author
    1. Laboratório de Nanomateriais, Departamento de Física Universidade Federal de Minas Gerais Av. Antônio Carlos 6627, 30123-970 Belo Horizonte MG (Brazil)
    • Laboratório de Nanomateriais, Departamento de Física Universidade Federal de Minas Gerais Av. Antônio Carlos 6627, 30123-970 Belo Horizonte MG (Brazil).
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  • The authors are indebted to Dr. Sharvari Dalal for fruitful discussions and suggestions and to Prof. Manish Chhowalla for reading the manuscript. This work was supported by Fapemig and Instituto do Milenio/CNPq-MCT. L.C.C., A.S.F., S.O., R.M., and R.G.L are CNPq fellows. The XRD measurements were made at the Brazilian Synchrotron Light Laboratory (LNLS). Supporting Information is available online from Wiley InterScience or from the author.

Abstract

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A comprehensive explanation for the precise mechanism of ZnO nanowire growth at low temperatures (T < 400 °C) is presented. Experimental data and theoretical considerations evidence that ZnO nanowires originate from solid γ-AuZn catalyst particles. A model is proposed to describe such growth. An original feature of the model concerns the formation of nanowire, which occurs via preferential oxidation of specific γ-AuZn surfaces induced by epitaxial-like growth mechanism.

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