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.
| Language | English |
|---|---|
| Pages | 108-119 |
| Number of pages | 12 |
| Journal | Microscopy and Microanalysis |
| Volume | 21 |
| Issue number | 1 |
| DOIs | |
| State | Published - 20 Jun 2015 |
| Event | 47th Annual Congress of the Portuguese Society for Microscopy - Monte da Caparica, Portugal Duration: 9 Dec 2013 → 10 Dec 2013 Conference number: 47th |
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Keywords
- cathodoluminescence
- cuprous oxide
- nanospheres
- photoluminescence
- precursor effect
- thermal behavior
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Room Temperature Synthesis of Cu2O Nanospheres: Optical Properties and Thermal Behavior. / Nunes, D.; Santos, L.; Duarte, P.; Pimentel, A.; Pinto, J. V.; Barquinha, P.; Carvalho, P. A.; Fortunato, E.; Martins, R.
In: Microscopy and Microanalysis, Vol. 21, No. 1, 20.06.2015, p. 108-119.Research output: Contribution to journal › Article
TY - JOUR
T1 - Room Temperature Synthesis of Cu2O Nanospheres: Optical Properties and Thermal Behavior
AU - Nunes,D.
AU - Santos,L.
AU - Duarte,P.
AU - Pimentel,A.
AU - Pinto,J. V.
AU - Barquinha,P.
AU - Carvalho,P. A.
AU - Fortunato,E.
AU - Martins,R.
N1 - The work was supported by the Fundacao para a Ciencia e a Tecnologia, through the scholarship BPD/84215/2012 and the projects EXCL/CTM-NAN/0201/2012, PEst-C/CTM/LA0025/2013-14, and PEST-OE/CTM-UI0084/2011, as well as the European project CEOPS with the grant Agreement No. 309984, and by the European Research Council regarding the ERC 2008 Advanced Grant (INVISIBLE Contract No. 228144).
PY - 2015/6/20
Y1 - 2015/6/20
N2 - 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.
AB - 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.
KW - cathodoluminescence
KW - cuprous oxide
KW - nanospheres
KW - photoluminescence
KW - precursor effect
KW - thermal behavior
UR - http://www.scopus.com/inward/record.url?scp=84925306296&partnerID=8YFLogxK
U2 - 10.1017/S1431927614013348
DO - 10.1017/S1431927614013348
M3 - Article
VL - 21
SP - 108
EP - 119
JO - Microscopy and Microanalysis
T2 - Microscopy and Microanalysis
JF - Microscopy and Microanalysis
SN - 1431-9276
IS - 1
ER -