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

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Abstract

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
Volume21
Issue number1
DOIs
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

Fingerprint

Nanospheres
nanocrystals
Optical properties
optical properties
Nanocrystals
room temperature
synthesis
synthesis (chemistry)
transmission electron microscopy
x rays
diffraction
Temperature
spectroscopy
hollow
Transmission electron microscopy
heat measurement
X ray diffraction
ion beams
surfactants
Focused ion beams

Keywords

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

Cite this

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abstract = "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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author = "D. Nunes and L. Santos and P. Duarte and A. Pimentel and Pinto, {J. V.} and P. Barquinha and Carvalho, {P. A.} and E. Fortunato and R. Martins",
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AU - Barquinha, P.

AU - Carvalho, P. A.

AU - Fortunato, E.

AU - Martins, R.

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