Structural phase transformations in radiolytically synthesized Al–Cu bimetallic nanoparticles

Farhad Larki, Alam Abedini, Md Shabiul Islam, Sahbudin Shaari, Sawal Hamid Md Ali, P. Susthitha Menon, Azman Jalar, Elias Saion, Jahariah Sampe, Burhanuddin Yeap Majlis

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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 languageEnglish
JournalJournal of Materials Science
DOIs
Publication statusAccepted/In press - 2 Apr 2015

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Paramagnetic resonance
Phase transitions
Nanoparticles
Gamma rays
Dosimetry
Fourier transform infrared spectroscopy
X ray diffraction
Field emission
Powders
Oxides
Copper
Energy dispersive spectroscopy
Particle size
Ions
Transmission electron microscopy
Scanning electron microscopy
Electrons

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 journalArticle

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AU - Islam, Md Shabiul

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AU - Ali, Sawal Hamid Md

AU - Susthitha Menon, P.

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