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Open AccessArticle

Melting and Recrystallization of Copper Nanoparticles Prepared by Microwave-Assisted Reduction in the Presence of Triethylenetetramine

1
Department of Chemical and Materials Engineering, National Kaohsiung University of Science & Technology, 415 Chien-Kuo Rd., Kaohsiung 80782, Taiwan
2
Department of Chemical and Materials Engineering, National Yun-Lin University of Science and Technology, Yun-Lin 64002, Taiwan
3
Department of Photonics, National Sun Yat-sen University, 70 Lienhai Rd., Kaohsiung 80424, Taiwan
4
Taiwan Textile Research Institute, 20, Kejia Rd., Douliou City, Yun-Lin 64057, Taiwan
*
Authors to whom correspondence should be addressed.
Materials 2020, 13(7), 1507; https://doi.org/10.3390/ma13071507 (registering DOI)
Received: 18 January 2020 / Revised: 15 March 2020 / Accepted: 23 March 2020 / Published: 26 March 2020
(This article belongs to the Special Issue Properties of Amorphous Materials and Nanomaterials)
The small sized copper nanoparticles (Cu-NPs), prepared in the presence of triethylene tetramine (TETA) and assisted with microwave irradiation, have an extremely low melting temperature. Melting of the small sizezd Cu-NPs can be triggered by the heat generated from the e-beam irradiation during SEM and TEM image construction. The dispersed Cu atoms around the agglomerated big Cu particles can undergo recrystallization immediately due to the strong driving force of the huge temperature difference to normal melting temperature (Tm = 1085 °C). Some of the Cu-NPs with bigger sizes also recrystallize and agglomerate into dense, big particles. According to X-ray diffraction patterns, these particles can agglomerate into compact, ordered Cu crystals in less than five minutes at 60 °C. The melting and recrystallization related endothermic and exothermic phase transitions of Cu-NPs can be found from differential scanning calorimeter (DSC) thermograms and optical microscopic pictures. View Full-Text
Keywords: microwave-assisted; nanocopper; triethylene tetramine; melting; recrystallization; chelation microwave-assisted; nanocopper; triethylene tetramine; melting; recrystallization; chelation
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MDPI and ACS Style

Jheng, L.-C.; Wang, Y.-Z.; Huang, W.-Y.; Ho, K.-S.; Tsai, C.-H.; Huang, C.-T.; Tsai, H.-S. Melting and Recrystallization of Copper Nanoparticles Prepared by Microwave-Assisted Reduction in the Presence of Triethylenetetramine. Materials 2020, 13, 1507.

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