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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Synthesis and characterization of DNA fenced, self-assembled SnO2 nano-assemblies for supercapacitor applications
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Synthesis and characterization of DNA fenced, self-assembled SnO2 nano-assemblies for supercapacitor applications

机译：用于超级电容器的DNA栅栏式自组装SnO2纳米组件的合成与表征

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Self-assembled, aggregated, chain-like SnO2 nano-assemblies were synthesized at room temperature by a simple wet chemical route within an hour in the presence of DNA as a scaffold. The average size of the SnO2 particles and the chain diameter were controlled by tuning the DNA to Sn(II) molar ratio and altering the other reaction parameters. A formation and growth mechanism of the SnO2 NPs on DNA is discussed. The SnO2 chain-like assemblies were utilized as potential anode materials in an electrochemical super-capacitor. From the supercapacitor study, it was found that the SnO2 nanomaterials showed different specific capacitance (C-s) values depending on varying chain-like morphologies and the order of C-s values was: chain-like (small size) > chain-like (large size). The highest C-s of 209 F g(-1) at a scan rate of 5 mV s(-1) was observed for SnO2 nano-assemblies having chain-like structure with a smaller size. The long term cycling stability study of a chain-like SnO2 electrode was found to be stable and retained ca. 71% of the initial specific capacitance, even after 5000 cycles. A supercapacitor study revealed that both morphologies can be used as a potential anode material and the best efficiency was observed for small sized chain-like morphology which is due to their higher BET surface area and specific structural orientation. The proposed route, by virtue of its simplicity and being environmentally benign, might become a future promising candidate for further processing, assembly, and practical application of other oxide based nanostructure materials.
机译：自组装的，聚集的，链状的SnO2纳米组装体在室温下，通过简单的湿化学途径，在一小时内在以DNA为骨架的存在下合成。通过调整DNA与Sn（II）的摩尔比并更改其他反应参数，可以控制SnO2颗粒的平均大小和链的直径。讨论了SnO2 NPs在DNA上的形成和生长机理。 SnO2链状组件被用作电化学超级电容器中的潜在阳极材料。从超级电容器研究中发现，SnO2纳米材料根据链状形态的变化显示出不同的比电容（Cs）值，并且Cs值的顺序为：链状（小尺寸）>链状（大尺寸） 。对于具有较小链状结构的SnO2纳米组件，在5 mV s（-1）的扫描速率下观察到209 F g（-1）的最高C-s。发现对链状SnO2电极的长期循环稳定性研究是稳定的，并保留了约。初始比电容的71％，即使经过5000次循环也是如此。超级电容器研究表明，这两种形态都可以用作潜在的阳极材料，并且由于其较高的BET表面积和特定的结构取向，对于小型链状形态，可以观察到最佳效率。所提出的路线，由于其简单性和环境友好性，可能成为其他基于氧化物的纳米结构材料的进一步加工，组装和实际应用的未来有希望的候选者。

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