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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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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]
Total Authors: 6
[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
Total Affiliations: 4
Document type: Journal article
Source: Physical Chemistry Chemical Physics; v. 22, n. 14, p. 7329-7339, APR 14 2020.
Web of Science Citations: 6

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)

FAPESP's process: 13/18719-1 - Electronic carriers dynamics in semiconductor nanostructures
Grantee:Marcio Daldin Teodoro
Support Opportunities: Research Grants - Young Investigators Grants
FAPESP's process: 14/19142-2 - Characterization and processing of semiconductor nanostructures and application as devices
Grantee:Gilmar Eugenio Marques
Support Opportunities: Research Projects - Thematic Grants
FAPESP's process: 15/13771-0 - Multi-User Equipment approved in grant 14/19142-2: ultra-low vibration cryostat with magnetic field and confocal microscope
Grantee:Gilmar Eugenio Marques
Support Opportunities: Multi-user Equipment Program
FAPESP's process: 14/07375-2 - Multi-user equipment approved in grant 2013/18719-1: time resolved measurement system
Grantee:Marcio Daldin Teodoro
Support Opportunities: Multi-user Equipment Program