AI Article Synopsis

  • Nanoflake-structured NiO nanoparticles were created using a microwave-assisted method, yielding a cubic phase confirmed through X-ray diffraction studies.
  • The transformation from hexagonal β-Ni(OH)2 to cubic NiO occurred around 350 °C, as noted in thermal analysis.
  • Analysis of size and morphology via transmission electron microscopy revealed that microwave powers of 600 W and 900 W produced uniform, flake-like NiO with enhanced magnetic properties and specific capacitance, indicating improved supercapacitor performance.

Article Abstract

Nanoflake-structured NiO were synthesized by a microwave assisted method without the use of additives. The cubic phase of NiO nanoparticles with increasing crystalline nature for higher microwave power is ascertained by X-ray diffraction studies. Previous reports revealed that hexagonally structured β-Ni(OH)2 was completely transferred into the cubic phase of NiO around 350 °C, confirmed by using thermal analysis (TG/DTA). In our present work, the size and morphology of nanoparticles are ascertained from transmission electron microscopy (TEM) analysis. Flake-like morphology with uniform size, shape and less agglomerated structure formation is obtained for 900 and 600 W of microwave power used for the synthesis of NiO samples. The effect of microwave power used for the synthesis of NiO nanoflakes was analyzed by studying the magnetic and electrochemical behavior of NiO nanoflakes. Room temperature magnetic measurements revealed the small ferromagnetic nature of NiO nanoparticles. It was observed that the samples synthesized at higher microwave power exhibited divergence behavior below 300 K in FC and ZFC measurements, which results superparamagnetic behavior. An enhanced supercapacitor performance with higher specific capacitance values was determined for NiO nanoflake samples synthesized at (25)600 W and 900 W of microwave power.

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Source
http://dx.doi.org/10.1039/c4dt03483jDOI Listing

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