Journal article Open Access

Formation of Nickel Nanoparticles and Magnetic Matrix in Nickel Phthalocyanine by Doping with Potassium

Aram S. Manukyan; Leon A. Avakyan; Anna E. Elsukova; Yan V. Zubavichus; Sergey N. Sulyanov; Armen A. Mirzakhanyan; Natalia A. Kolpacheva; Marina Spasova; Armen N. Kocharian; Michael Farle; Lusegen A. Bugaev; Eduard G. Sharoyan

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 (K2NiPc) 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.

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