Synthesis, growth mechanism, optical properties and catalytic activity of ZnO microcrystals obtained via hydrothermal processing
作者： Edgar Alves Araújo Júnior , Francisco Xavier Nobre , Giancarlo da Silva Sousa , Laécio Santos Cavalcante , Maria Rita de Morais Chaves Santos
DOI: 10.1039/C7RA03277C
关键词:
摘要: In the present study, typical ZnO microcrystals exhibiting wurtzite hexagonal crystal structure were produced successfully, characterized by a high degree of crystallinity, via hydrothermal processing at 120, 150 and 180 °C, assisted N-cetyl-N,N,N-trimethylammonium (CTAB). The samples characterised XRD, Raman infrared, FE-SEM, UV-Vis diffuse reflectance photoluminescence (PL). experimental results confirm that all hydrothermally synthesised crystallised into structure. crystals exhibit morphology columns in absence double presence CTAB. length average diameter microstructures decrease with increasing temperature. It is evident very similar profiles band positions PL emission spectra, an violet range approximately 400 nm, small peak UV 380 highly superposed intense bands between 440 750 nm (blue to red emission), maximum 610 nm. Furthermore, nucleation growth model was proposed explain formation microcrystals, based on conditions, preferably grown [001] direction. addition, exhibited excellent performance photocatalytic degradation rhodamine B (RhB) methyl orange (MO), achieving 97% 99% photodegradation RhB MO, respectively, when obtained 120 CTAB, used as catalyst.
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