Specific Solvent Produces Specific Phase Ni Nanoparticles: A Pulsed Laser Ablation in Solvents
Abstract
In this paper, we present a simple and controllable preparation of face centered cubic (fcc) and hexagonal close-packed (hcp) Ni nanoparticles by a pulsed Nd:YAG laser ablation method in the following four solvents: deionized water, methanol, hexane, and acetonitrile. We generated Ni/NiO, fcc, and/or hcp Ni nanoparticles by primary ablation to a Ni plate submerged in various solvents, followed by secondary ablation to the colloidal solutions. Interestingly, the phases of Ni nanoparticles prepared via a pulsed laser ablation in liquid (PLAL) show a strong dependence on the solvents used in the ablation processes. Ni/NiO, pure fcc, and a mixture of fcc and hcp Ni nanoparticles were generated in DI water, methanol, and hexane or acetonitrile, respectively. After secondary ablation, however, pure fcc Ni nanoparticles were generated in methanol and hexane, while pure hcp Ni was formed in acetonitrile. We think that the solvent dependence on the phase of Ni nanocrystals is related to the specific heat of solvents which plays an important role kinetically and thermodynamically in the process of cooling the plasma plume where the nanoparticles nucleate and coalesce to a specific phase. The Ni nanoparticles prepared from PLAL were analyzed by X-ray diffraction (XRD) measurement, X-ray photoelectron spectroscopy (XPS), field emission-scanning electron microscopy (FE-SEM), high resolution-transmission electron microscopy (HR-TEM), selected area electron diffraction (SAED), and fast Fourier transform (FFT) analysis.
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Our research group found that PLA of Ni in DI water and methanol produced fcc Ni/NiO and pure fcc Ni NPs, respectively, while a mixture of fcc/hcp Ni phases was obtained in both hexane and ACN.
“Interestingly, it was identified that the specific solvents resulted in specific Ni NP phases; fcc Ni/NiO and pure fcc Ni NPs were obtained in DI water and methanol medium, respectively, while a mixture of fcc/hcp Ni phases was obtained in both hexane and ACN.”
From Fundamentals and comprehensive insights on pulsed laser synthesis of advanced materials for diverse photo- and electrocatalytic applications (2022) · cites this paper as [32]
The NP size is reduced upon second irradiation, resulting in fragmentation of formed NPs in primary ablation and renucleation into smaller sizes.
“Furthermore, the NP size is reduced upon second irradiation, resulting in the fragmentation of the formed NPs in the primary ablation and renucleation into smaller sizes.”
From Fundamentals and comprehensive insights on pulsed laser synthesis of advanced materials for diverse photo- and electrocatalytic applications (2022) · cites this paper as [32]
The cooling rate mainly depends on specific heats of solvents; those with lower specific heat cool the plasma plume efficiently and produce the metastable phase of hcp Ni NPs.
“Thus, the cooling rate mainly depends on the specific heats of solvents; those with lower specific heat cool the plasma plume efficiently and produce the metastable phase of hcp Ni NPs (specific heats: ACN (2.2 J kg−1) < hexane (2.3 J kg−1) < methanol (2.5 J kg−1) < DI water (4.2 J kg−1)).”
From Fundamentals and comprehensive insights on pulsed laser synthesis of advanced materials for diverse photo- and electrocatalytic applications (2022) · cites this paper as [32]
NP formation during PLA is strongly dependent on the solvent medium; specific heats of different solvents produce distinct phases of Ni NPs.
“The observed results indicated that NP formation during the PLA process is strongly dependent on the solvent medium; as a result, the specific heats of different solvents produce the distinct phases of Ni NPs.”
From Fundamentals and comprehensive insights on pulsed laser synthesis of advanced materials for diverse photo- and electrocatalytic applications (2022) · cites this paper as [32]
Secondary laser irradiation for another 20 min caused no changes in DI water and methanol samples, but pure fcc Ni and hcp Ni phases were obtained in hexane and ACN, respectively.
“We further performed secondary laser irradiation for the obtained colloidal solution for another 20 min and noticed that there were no changes in DI water and methanol samples; however, pure fcc Ni and hcp Ni phases were obtained in hexane and ACN, respectively, and the resulting XRD pattern is shown in Fig. 6.”
From Fundamentals and comprehensive insights on pulsed laser synthesis of advanced materials for diverse photo- and electrocatalytic applications (2022) · cites this paper as [32]
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In situ Observations of Catalyst Dynamics during Surface-Bound Carbon Nanotube Nucleation
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Laser Synthesis and Processing of Colloids: Fundamentals and Applications
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Self-citation
- Authors
- Jung, H. J., & Choi, M. Y.
- Affiliations
- Gyeongsang National University (KR)
- Corresponding author
- Choi, Myong Yong
- Venue
- The Journal of Physical Chemistry C
- Publisher
- American Chemical Society (ACS)
- Published
- 2014-06-23
- Volume
- 118
- Issue
- 26
- Pages
- 14647-14654
- ISSN
- 1932-7447 (ISSN-L)
- 1932-7455
- OpenAlex
- W2329628056
- Cited by
- 93
- References
- 4
- Citations by year
- 2026: 10 · 2025: 11 · 2024: 12 · 2023: 13 · 2022: 9 · 2021: 8 · 2020: 6 · 2019: 2 · 2018: 7 · 2017: 9 · 2016: 2 · 2015: 4
- FWCI
- 2.60
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- The Journal of Physical Chemistry C (publishedVersion)
- Topics
- Physical Sciences › Engineering › Biomedical Engineering › Laser-Ablation Synthesis of Nanoparticles
- Physical Sciences › Materials Science › Electronic, Optical and Magnetic Materials › Gold and Silver Nanoparticles Synthesis and Applications
- Physical Sciences › Engineering › Computational Mechanics › Laser Material Processing Techniques
- Keywords
- nickel nanoparticles, pulsed laser ablation in liquid, solvent effects, crystal phase control, face-centered cubic nickel
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