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 resolutiontransmission electron microscopy (HR-TEM), selected area electron diffraction (SAED), and fast Fourier transform (FFT) analysis.

Solvent Acting as a Precursor: Synthesis ofAgCNFromAgNO3inN,N‐DMFSolvent by Laser Ablation

“…Furthermore, the extremely confined conditions induced by PLAL, such as high temperature and pressure, favor the formation of unusual metastable phases . Thus, the synthesis of metastable materials, e.g ., hexagonal close‐packed Ni nanoparticles and anatase TiO 2, has been accomplished easily compared with the conventional wet‐chemical synthesis.…”

“…In recent years, many studies have been actively conducted on the generation of metal nanoparticles or carbon compounds in organic solvents by a pulsed laser ablation in liquid (PLAL) method . There are several advantages of using this “simple and clean” synthesis, PLAL.…”

“…5,6 In recent years, many studies have been actively conducted on the generation of metal nanoparticles or carbon compounds in organic solvents by a pulsed laser ablation in liquid (PLAL) method. [7][8][9] There are several advantages of using this "simple and clean" synthesis, PLAL. One of them includes that the final product is usually obtained without any by-products, meaning that no further purification is needed and it is environmentally friendly.…”

Perspective of Surfactant‐Free Colloidal Nanoparticles in Heterogeneous Catalysis

“…Au � 1:7 3.3-6.6 [28,54,129] (12) [130] Pt � 1:2 20-40 [78,131] (42-73) [132] Pd � 0:85 71 [51] Ag � 0:8 80-84 [133] Ni � À 0:23 100 [56,134] [a] @pH = 0 j vs. NHE [128]; [b] (XPS) Reviews manganese, etc. leads to the partial or complete oxidation of the generated nanoparticles.…”

Synthesis of Ni Nanoparticles by Femtosecond Laser Ablation in Liquids: Structure and Sizing

“…21 Jung and Choi have worked with a Q-switched Nd:YAG laser at its fundamental wavelength to ablate Ni target in different solvents and have studied their final crystallographic phase, concluding that it is related to the thermodynamic factors of the laser-induced plasma plume and to the specific heat of the solvents. 22 Musaev et al 4 fabricated colloids of Ni in water by laser ablation with a nitrogen laser of 10 ns pulse duration and determined its composition using X-ray diffraction (XD). 23 However, there are no works reporting on the fabrication and characterization of colloids obtained using fs-regime laser ablation of Ni in liquids.…”