Room Temperature Synthesis of Cu2O Nanospheres: Optical Properties and Thermal Behavior

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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.

Original languageEnglish
Pages (from-to)108-119
Number of pages12
JournalMicroscopy and Microanalysis
Issue number1
Publication statusPublished - 20 Jun 2015
Event47th Annual Congress of the Portuguese Society for Microscopy - Monte da Caparica, Portugal
Duration: 9 Dec 201310 Dec 2013
Conference number: 47th


  • cathodoluminescence
  • cuprous oxide
  • nanospheres
  • photoluminescence
  • precursor effect
  • thermal behavior


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