Self-Assembled NiWO4 Nanoparticles into Chain-like Aggregates on DNA Scaffold with Pronounced Catalytic and Supercapacitor Activities

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• 作者：U. Nithiyanantham ; Sivasankara Rao Ede ; S. Anantharaj ; Subrata Kundu
• 刊名：Crystal Growth & Design
• 出版年：2015
• 出版时间：February 4, 2015
• 年：2015
• 卷：15
• 期：2
• 页码：673-686
• 全文大小：811K
• ISSN：1528-7505

文摘

We report a new route for the self-assembled NiWO₄ nanoparticles (NPs) in chain-like aggregates on a DNA scaffold by the reaction of nickel(II) acetate with sodium tungstate under continuous stirring and heating at 60 掳C within 90 min of reaction. The size of the individual NiWO₄ particles was found to be 鈭?0鈥?0 nm and the diameter of the aggregates was in the 鈭?20 卤 30 nm range. The probable growth mechanisms of DNA鈥揘iWO₄ chain-like aggregates were elaborated. The potential of the NiWO₄ chain-like aggregates was tested in catalytic reaction and in electrochemical supercapacitor studies. Catalysis study revealed that the NiWO₄ aggregated structure acts as a suitable catalyst for the conversion of K₃[Fe(CN)₆] to K₄[Fe(CN)₆] in the presence of Na₂S₂O₃ under UV-light illumination within a short time. Supercapacitor study signified that different morphologies of NiWO₄ show different specific capacitance (C) values, and the highest C value of 173 F g^鈥? at a scan rate of 5 mV s^鈥? was observed while chain diameter was less. The supercapacitor study also revealed an excellent long cycle life along with 90% retention of C value even after 1000 consecutive times of cycling. The exploitation for the synthesis of mixed metal oxide on DNA scaffold might generate a new avenue for the successful formation of other oxides and can be useful for organic catalysis reactions and in future energy storage devices.