Growth and formation mechanism of shape-selective preparation of ZnO structures: correlation of structural, vibrational and optical properties

Autor(es)

Montero-Munoz, M. ^[1] ; Ramos-Ibarra, J. E. ^{[1, 2]} ; Rodriguez-Paez, J. E. ^[3] ; Marques, G. E. ^[4] ; Teodoro, M. D. ^[4] ; Coaquira, J. A. H. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Brasilia, Inst Phys, BR-70910900 Brasilia, DF - Brazil

^[2] Univ Ctr Estacio Brasilia, BR-72035509 Brasilia, DF - Brazil

^[3] Univ Cauca, Dept Phys, Popayan Cauca 190002 - Colombia

^[4] Univ Fed Sao Carlos, Dept Phys, BR-13565905 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Physical Chemistry Chemical Physics; v. 22, n. 14, p. 7329-7339, APR 14 2020.
• Citações Web of Science: 6

Resumo

A shape-selective preparation method was used to obtain highly crystalline rod-, needle-, nut-, and doughnut-like ZnO morphologies with distinct particle sizes and surface areas. We study the nucleation and growth mechanism of those structures and the influence of physical-chemical parameters, such as the solvent and the pH of the solution, on the morphology, as well as the structural and optical properties. A clear correlation between the growth rate along the c-axis and surface defects was established. Our results suggest that the needle- and rod-like morphologies are formed due to the crystal growth orientation along the c-axis and the occurrence of crystalline defects, such as oxygen vacancies and interstitial Zn2+ located at the surface, whereas nuts and doughnuts are formed due to growth along all crystalline planes except those related to growth along the c-axis. Based on the experimental results, growth mechanisms for the formation of ZnO structures were proposed. We believe this synthetic route will be of guidance to prepare several materials whose shapes will depend on the desired applications. (AU)

• Processo FAPESP: 13/18719-1 - Dinâmica de portadores eletrônicos em nanoestruturas semicondutoras
• Beneficiário: Marcio Daldin Teodoro
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores
• Processo FAPESP: 14/19142-2 - Caracterização e processamento de nanoestruturas semicondutoras e aplicações como dispositivos
• Beneficiário: Gilmar Eugenio Marques
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 15/13771-0 - EMU concedido no processo 14/19142-2: criostato de ultra baixa vibração com campo magnético e microscópio confocal
• Beneficiário: Gilmar Eugenio Marques
• Modalidade de apoio: Auxílio à Pesquisa - Programa Equipamentos Multiusuários
• Processo FAPESP: 14/07375-2 - EMU concedido no projeto 2013/18719-1: sistema de medidas resolvidas no tempo
• Beneficiário: Marcio Daldin Teodoro
• Modalidade de apoio: Auxílio à Pesquisa - Programa Equipamentos Multiusuários