Formation of nickel nanoparticles and magnetic matrix in nickel phthalocyanine by doping with potassium

Abstract

A method for synthesis of nickel nanoparticles in a magnetic nickel phthalocyanine anions matrix has been developed.The method is based on intercalation of potassium atoms to the nickel phthalocyanine (NiPc) polycrystalline powder at 300°C. The structure of (K 2 NiPc) was investigated by using high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD) and X-ray absorption fine structure (XAFS) spectroscopes. Magnetic properties were studied by SQUID magnetometry and magnetic resonances methods. It is revealed that the resultant compound contains of 1 wt% Ni nanoparticles with the average size of 15 nm. The measured values of the magnetization and absorption of the ferromagnetic resonance considerably exceed the magnetism which can be attributed to metallic Ni nanoparticles. The obtained results indicate the presence of room temperature molecular ferromagnetism caused by anionic molecules of NiPc.

Ni Nanoparticles on Ni Core/N-Doped Carbon Shell Heterostructures for Electrocatalytic Oxygen Evolution

“…The Ni foil and bulk NiO were also displayed for comparison. In the R -space range of 1.0–3.0 Å, the Ni foil showed a peak centered at 2.48 Å, corresponding to the first coordination shell (Ni–Ni) of hcp Ni, − while bulk NiO exhibited two peaks centered at 2.09 and 2.95 Å, corresponding to the first (Ni–O) and second (Ni–Ni 2 ) coordination shells of the rock salt structure of NiO, respectively. , On the contrary, the Ni K-edge R-space EXAFS spectra of the Ni-NC-2 sample were quite different from those of the Ni foil and bulk NiO. Except for the first coordination shell at 2.05 Å, other scattering EXAFS paths could not be observed at all.…”

Atomic Dual‐Site Ni/Co‐Decorated Carbon Nanofiber Paper for Efficient O2 Electrocatalysis and Flexible Zn‐Air Battery

“…As shown in Figure 3a, the absorption threshold of the Ni K edge of Ni 1 Co 1 ‐CNF is located between Ni foil and NiO, and is relatively close to NiPc, which means that the Ni species in Ni 1 Co 1 ‐CNF has a positive valence state [16] . detected the fingerprint peak corresponding to the planar Ni‐N 4 species of NiPc at ∼8339 eV, further indicating that the possible coordination environment of the Ni species in Ni 1 Co 1 ‐CNF is planar Ni‐N 4 , but there is a distortion in the structure [17] . The main peak of Ni 1 Co 1 ‐CNF detected in R space is concentrated in ca.…”

“…[16] detected the fingerprint peak corresponding to the planar Ni-N 4 species of NiPc at ~8339 eV, further indicating that the possible coordination environment of the Ni species in Ni 1 Co 1 -CNF is planar Ni-N 4 , but there is a distortion in the structure. [17] The main peak of Ni 1 Co 1 -CNF detected in R space is concentrated in ca. 1.6 Å, the closest to NiPc (Figure 3b), indicating that its Ni species are mainly composed of the NiÀ N coordination pathway.…”

Optimization of Epoxidation Palm-Based Oleic Acid to Produce Polyols

“…For NiNPs with the average diameter of 4 nm zero field cooled (ZFC) and field cooled (FC) magnetization versus temperature displayed magnetic interaction effect at approximately 5 K, indicating the super paramagnetic behavior. 48 Magnetic anisotropic constant was estimated to be 4.62•10 5 erg/cm 3 , and coercive field was 168 Oe at 3 K. 49 NiNPs were synthesized in a magnetic Ni phthalocyanine anions matrix based on intercalation between potassium atoms and Ni phthalocyanine (NiPc) at 573 K. It was found that K 2 NiPc had approximately 1 wt% of NiNPs with the average diameter of 15 nm and with fcc structure. The measured values of magnetization and absorption of ferromagnetic resonance considerably predominated the magnetism which could be attributed to pure NiNPs.…”