Ni Nanoparticles Stabilized by Hyperbranched Polymer: Does the Architecture of the Polymer Affect the Nanoparticle Characteristics and Their Performance in Catalysis?

• Published in: International journal of molecular sciences Vol. 23; no. 22; p. 13874
• Main Authors: Sorokina, Svetlana A, Kuchkina, Nina V, Ezernitskaya, Mariam G, Bykov, Alexey V, Vasiliev, Alexander L, Efimov, Nikolay N, Shifrina, Zinaida B
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 10-11-2022; MDPI
• Subjects: Catalysis; Catalysts; Catalytic activity; Chemical reactions; Controllability; Cross coupling; Decomposition; Energy dispersive X ray analysis; Heat; hyperbranched polymer; Magnetic measurement; magnetic properties; Magnetic separation; Microscopy, Electron, Scanning Transmission; Nanoparticles; Nanoparticles - chemistry; nickel nanoparticles; Oxidation-Reduction; Photoelectron spectroscopy; Photoelectrons; Polymers; Size distribution; Stabilizers (agents); Suzuki-Miyaura cross-coupling; Thermogravimetric analysis; Transmission electron microscopy; X ray analysis; X ray powder diffraction; X-ray diffraction; catalysis; magnetic properties; nickel nanoparticles; Suzuki-Miyaura cross-coupling; hyperbranched polymer
• ISSN: 1422-0067; 1661-6596; 1422-0067
• DOI: 10.3390/ijms232213874

Heat-up and hot-injection methods were employed to synthesize Ni nanoparticles (NPs) with narrow size distribution in the presence of hyperbranched pyridylphenylene polymer (PPP) as a stabilizing agent. It was shown that depending on the synthetic method, Ni NPs were formed either in a cross-linked polymer network or stabilized by a soluble hyperbranched polymer. Ni NPs were characterized by a combination of transmission electron microscopy (TEM), scanning TEM, thermogravimetric analysis, powder X-ray diffraction, X-ray photoelectron spectroscopy, energy dispersive X-ray analysis, and magnetic measurements. The architecture of polymer support was found to significantly effect Ni NPs characteristics and behavior. The Ni NPs demonstrated a high catalytic activity in a model Suzuki-Miyaura cross-coupling reaction. No significant drop in activity was observed upon repeated use after magnetic separation in five consecutive catalytic cycles. We believe that hyperbranched PPP can serve as universal platform for the controllable synthesis of Ni NPs, acting as highly active and stable catalysts.