期刊
MICROSCOPY AND MICROANALYSIS
卷 21, 期 1, 页码 108-119出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S1431927614013348
关键词
cuprous oxide; nanospheres; photoluminescence; cathodoluminescence; precursor effect; thermal behavior
资金
- Fundacao para a Ciencia e a Tecnologia [BPD/84215/2012, EXCL/CTM-NAN/0201/2012, PEst-C/CTM/LA0025/2013-14, PEST-OE/CTM-UI0084/2011]
- European project CEOPS [309984]
- European Research Council [228144]
- Fundação para a Ciência e a Tecnologia [PEst-OE/CTM/UI0084/2011] Funding Source: FCT
The present work reports a simple and easy wet chemistry synthesis of cuprous oxide (Cu2O) nanospheres at room temperature without surfactants and using different precursors. Structural characterization was carried out by X-ray diffraction, transmission electron microscopy, and scanning electron microscopy coupled with focused ion beam and energy- dispersive X-ray spectroscopy. The optical band gaps were determined from diffuse reflectance spectroscopy. The photoluminescence behavior of the as-synthesized nanospheres showed significant differences depending on the precursors used. The Cu2O nanospheres were constituted by aggregates of nanocrystals, in which an on/off emission behavior of each individual nanocrystal was identified during transmission electron microscopy observations. The thermal behavior of the Cu2O nanospheres was investigated with in situ X-ray diffraction and differential scanning calorimetry experiments. Remarkable structural differences were observed for the nanospheres annealed in air, which turned into hollow spherical structures surrounded by outsized nanocrystals.
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