Abstract
The structural changes of radiolytically prepared aluminium–copper (Al–Cu) bimetallic nanoparticles by adjusting the precursors’ mole ratio and gamma radiation dose were investigated by transmission electron microscopy, field emission scanning electron microscopy/energy dispersive spectroscopy, X-ray diffraction, Fourier transform infrared spectroscopy (FTIR), and X-band continuous wave electron paramagnetic resonance (EPR). The EPR spectrum was also analysed through the simulation of the powder-like EPR spectra. The results note that in prepared samples with higher Al contents, formation of core–shell structure is dominant, whereas in Cu-rich samples, the final structures are primarily in alloy and oxide forms. According to the analysis of data obtained from X-ray diffraction, FTIR, and EPR, we found that the unpaired electron of the Cu2+ ion in various phases play the main role in structural phase transformation of Al–Cu nanoparticles. Additionally, based on the information extracted from simulated EPR peaks of Cu–Cu, the diameter of the Cu core in core–shell structures was obtained. We showed that by increasing the gamma radiation dose from 80 to 120 kGy, the overall size of nanoparticles decreases from 9.47 to 3.75 nm, but the contribution of copper core increases from 11 to 22 % of overall particle size.
| Original language | English |
|---|---|
| Journal | Journal of Materials Science |
| DOIs | |
| Publication status | Accepted/In press - 2 Apr 2015 |
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ASJC Scopus subject areas
- Materials Science(all)
- Mechanics of Materials
- Mechanical Engineering
Cite this
Structural phase transformations in radiolytically synthesized Al–Cu bimetallic nanoparticles. / Larki, Farhad; Abedini, Alam; Islam, Md Shabiul; Shaari, Sahbudin; Ali, Sawal Hamid Md; Susthitha Menon, P.; Jalar, Azman; Saion, Elias; Sampe, Jahariah; Majlis, Burhanuddin Yeap.
In: Journal of Materials Science, 02.04.2015.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Structural phase transformations in radiolytically synthesized Al–Cu bimetallic nanoparticles
AU - Larki, Farhad
AU - Abedini, Alam
AU - Islam, Md Shabiul
AU - Shaari, Sahbudin
AU - Ali, Sawal Hamid Md
AU - Susthitha Menon, P.
AU - Jalar, Azman
AU - Saion, Elias
AU - Sampe, Jahariah
AU - Majlis, Burhanuddin Yeap
PY - 2015/4/2
Y1 - 2015/4/2
N2 - The structural changes of radiolytically prepared aluminium–copper (Al–Cu) bimetallic nanoparticles by adjusting the precursors’ mole ratio and gamma radiation dose were investigated by transmission electron microscopy, field emission scanning electron microscopy/energy dispersive spectroscopy, X-ray diffraction, Fourier transform infrared spectroscopy (FTIR), and X-band continuous wave electron paramagnetic resonance (EPR). The EPR spectrum was also analysed through the simulation of the powder-like EPR spectra. The results note that in prepared samples with higher Al contents, formation of core–shell structure is dominant, whereas in Cu-rich samples, the final structures are primarily in alloy and oxide forms. According to the analysis of data obtained from X-ray diffraction, FTIR, and EPR, we found that the unpaired electron of the Cu2+ ion in various phases play the main role in structural phase transformation of Al–Cu nanoparticles. Additionally, based on the information extracted from simulated EPR peaks of Cu–Cu, the diameter of the Cu core in core–shell structures was obtained. We showed that by increasing the gamma radiation dose from 80 to 120 kGy, the overall size of nanoparticles decreases from 9.47 to 3.75 nm, but the contribution of copper core increases from 11 to 22 % of overall particle size.
AB - The structural changes of radiolytically prepared aluminium–copper (Al–Cu) bimetallic nanoparticles by adjusting the precursors’ mole ratio and gamma radiation dose were investigated by transmission electron microscopy, field emission scanning electron microscopy/energy dispersive spectroscopy, X-ray diffraction, Fourier transform infrared spectroscopy (FTIR), and X-band continuous wave electron paramagnetic resonance (EPR). The EPR spectrum was also analysed through the simulation of the powder-like EPR spectra. The results note that in prepared samples with higher Al contents, formation of core–shell structure is dominant, whereas in Cu-rich samples, the final structures are primarily in alloy and oxide forms. According to the analysis of data obtained from X-ray diffraction, FTIR, and EPR, we found that the unpaired electron of the Cu2+ ion in various phases play the main role in structural phase transformation of Al–Cu nanoparticles. Additionally, based on the information extracted from simulated EPR peaks of Cu–Cu, the diameter of the Cu core in core–shell structures was obtained. We showed that by increasing the gamma radiation dose from 80 to 120 kGy, the overall size of nanoparticles decreases from 9.47 to 3.75 nm, but the contribution of copper core increases from 11 to 22 % of overall particle size.
UR - http://www.scopus.com/inward/record.url?scp=84926182951&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84926182951&partnerID=8YFLogxK
U2 - 10.1007/s10853-015-8988-y
DO - 10.1007/s10853-015-8988-y
M3 - Article
JO - Journal of Materials Science
JF - Journal of Materials Science
SN - 0022-2461
ER -