caa a22 4500 463211243 CHVBK 20180405153141.0 cr unu---uuuuu 170326e20070701xx s 000 0 eng 10.1007/s00339-007-3946-4 doi (NATIONALLICENCE)springer-10.1007/s00339-007-3946-4 Nanostructure size evolution during Au-catalysed growth by carbo-thermal evaporation of well-aligned ZnO nanowires on (100)Si [Elektronische Daten] [P. Prete, N. Lovergine, L. Tapfer] We report the structural and morphological properties of well-aligned ZnO nanowires grown at 750°C on Au-deposited and annealed (100)Si substrates using carbo-thermal evaporation. As-grown nanowires are made of wurtzite ZnO, have cylindrical shape and carry droplet-like nanoparticles (NPs) at their tips, as expected for vapour-liquid-solid (VLS) growth. Grazing incidence X-ray diffraction measurements demonstrate that the NPs are made of pure fcc Au. No secondary Au/Zn alloy phases were detected. Bragg diffraction patterns confirmed that the nanowires were grown with their crystal c-axes parallel to the [100] direction of Si (i.e. normal to the substrate surface), while Au NPs are mostly (111)-oriented. The diameter distribution of ZnO nanowires mimics that of the Au NPs at their tips. A quantitative study of the nanostructure size distribution after sequential annealing and growth steps evidences the occurrence of three nanoscale processes: (i) Ostwald ripening and/or coalescence of Au NPs before nanowire nucleation, (ii) Au-catalysed VLS nucleation and axial growth of ZnO nanowires and (iii) radial growth of nanowires by a vapour-solid process. These processes originate the NP and nanowire size evolution during the experiments. The present findings are interpreted in terms of Zn vapour pressure changes during carbo-thermal evaporation. Springer-Verlag, 2007 Prete P. Unità di Lecce, Istituto per la Microelettronica e Microsistemi (IMM) del CNR, Via Arnesano, 73100, Lecce, Italy aut Lovergine N. CNISM, Unità di Lecce, and Dipartimento di Ingegneria dell'Innovazione, Università di Lecce, Via Arnesano, 73100, Lecce, Italy aut Tapfer L. Dipartimento di Tecnologie Fisiche e Nuovi Materiali (FIM), Centro Ricerche di Brindisi, Ente per le Nuove Tecnologie, l'Energia e l'Ambiente (ENEA), Strada Statale 7 ‘Appia', km 713 + 700, 72100, Brindisi, Italy aut Applied Physics A Springer-Verlag 88/1(2007-07-01), 21-26 0947-8396 88:1<21 2007 88 339 https://doi.org/10.1007/s00339-007-3946-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00339-007-3946-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Prete P. Unità di Lecce, Istituto per la Microelettronica e Microsistemi (IMM) del CNR, Via Arnesano, 73100, Lecce, Italy aut NATIONALLICENCE 700 1- Lovergine N. CNISM, Unità di Lecce, and Dipartimento di Ingegneria dell'Innovazione, Università di Lecce, Via Arnesano, 73100, Lecce, Italy aut NATIONALLICENCE 700 1- Tapfer L. Dipartimento di Tecnologie Fisiche e Nuovi Materiali (FIM), Centro Ricerche di Brindisi, Ente per le Nuove Tecnologie, l'Energia e l'Ambiente (ENEA), Strada Statale 7 ‘Appia', km 713 + 700, 72100, Brindisi, Italy aut NATIONALLICENCE 773 0- Applied Physics A Springer-Verlag 88/1(2007-07-01), 21-26 0947-8396 88:1<21 2007 88 339 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer