NiO Nanoparticle Synthesis Using a Triblock Copolymer: Enhanced Magnetization and High Specific Capacitance of Electrodes Prepared from the Powder

Nickel oxide nanoparticles of diameter ∼21 nm were prepared by a sol–gel method using the triblock copolymer poly­(ethylene glycol)-b-(propylene glycol)-b-(ethylene glycol). X-ray photoelectron spectroscopy analysis showed the presence of Ni2+ and Ni3+ ions in the material. The electrical conductivi...

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Veröffentlicht in:ACS omega 2017-01, Vol.2 (1), p.283-289
Hauptverfasser: Chatterjee, Soumi, Maiti, Ramaprasad, Miah, Milon, Saha, Shyamal Kumar, Chakravorty, Dipankar
Format: Artikel
Sprache:eng
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Zusammenfassung:Nickel oxide nanoparticles of diameter ∼21 nm were prepared by a sol–gel method using the triblock copolymer poly­(ethylene glycol)-b-(propylene glycol)-b-(ethylene glycol). X-ray photoelectron spectroscopy analysis showed the presence of Ni2+ and Ni3+ ions in the material. The electrical conductivity of this material was due to small polaron hopping between Ni2+ and Ni3+ sites. The magnetization shown by these nanoparticles was much higher than that reported in the literature. This is ascribed to the presence of Ni3+ ions with uncompensated spin moments. Spin-glass behavior was exhibited by the material at 10.7 K. The electrochemical characterization of electrodes comprising of these NiO nanoparticles using cyclic voltammetric measurements showed a specific capacitance value of 810 F/g, the highest reported for this material. These materials will thus form one of the useful multifunctional systems.
ISSN:2470-1343
2470-1343
DOI:10.1021/acsomega.6b00384