Facile controlled synthesis of micro/nanostructure MCrO4 (M=Ba, Pb) by using Gemini surfactant C12-PEG-C12 as a soft template

Autor: Anjian Xie, Wengui Chang, Yuhua Shen, Xue Liu
Rok vydání: 2010
Předmět:
Zdroj: Applied Surface Science. 256:4292-4298
ISSN: 0169-4332
DOI: 10.1016/j.apsusc.2010.02.017
Popis: Gemini surfactants, double sodium α-sulfonic polyethylene glycol laurate (abbreviated C 12 -PEG-C 12 ), were prepared and applied as soft templates in the controlled synthesis of BaCrO 4 and PbCrO 4 micro/nanocrystals. The template effects were investigated by adjusting the length of the spacer, using PEG400 and PEG4000, of the Gemini surfactant. The results indicated that the size and morphology of BaCrO 4 and PbCrO 4 micro/nanocrystals varied with the change in spacer length of C 12 -PEG-C 12 , suggesting that the different lengths of the polyethylene glycol group spacers in the Gemini surfactants played a key role in determining the size and shape of the MCrO 4 micro/nanoparticles. The dynamic process of the formation of the novel morphology BaCrO 4 crystals showed that the morphology grew from a round-bar polyhedron, to regular polyhedron, to approximate octahedron to a uniform pistachio nut shape. The growth mechanism of the BaCrO 4 micro/nanocrystals was explained that C 12 -PEG-C 12 had a greater interfacial adsorption and would effectively control the shape evolution during the crystal growth, while PbCrO 4 could be explained that the Gemini surfactants can undergo liquid-crystalline phase transitions with long channels providing a soft template effect and derived the nanorods formation. Room temperature fluorescence spectra were studied and these showed that the pistachio-shaped BaCrO 4 microcrystals and PbCrO 4 nanorods possess photoactive luminescence properties with emission peaks at 470 and 549 nm, respectively.
Databáze: OpenAIRE
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