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Synthesis of au/co hollow microspheres via galvanic replacement reaction in organic solvent

机译:在有机溶剂中通过电置换反应合成au / co空心微球

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摘要

Cobalt/gold hollow microspheres were successfully prepared through galvanic replacement in an organic solvent. The diameters of these hollow microspheres ranged from 800 nm to 1 μm. However, the surface of the hollow microsphere was very rough. Nanospikes of various lengths from about 40 to 100 nm were grown on the surface of these spheres. Initially, particles with "island-like" rough surfaces were found with the addition of 4 ml chloroauric acid (HAuCl_4). When the volume of HAUCl_4 increased from 4 to 5 ml, microspheres with a hollow structure were formed. Some broken microspheres were observed when HAuCl_4) was further increased to 6 ml. X-ray diffraction results showed a high-intensity sharp peak of gold when the HAuCl_4 in the sample increased. After the galvanic replacement reaction, the cobalt content in the sample decreased meanwhile the gold content increased. This can be seen from energy dispersive X-ray analysis spectroscopy and also evident from the thermo gravimetric analysis result. The hollow Au/Co microspheres showed two broad plasmonic peaks in the ultraviolet-visible measurement. The plasmonic peaks at longer wavelengths shifted to the near-infrared region with the addition of HAUCl_44.
机译:钴/金空心微球是通过在有机溶剂中经电取代成功制备的。这些空心微球的直径范围为800 nm至1μm。但是,中空微球的表面非常粗糙。在这些球的表面上生长了约40至100 nm的各种长度的纳米钉。最初,通过添加4 ml氯金酸(HAuCl_4)发现具有“岛状”粗糙表面的颗粒。当HAUCl_4的体积从4ml增加到5ml时,形成具有空心结构的微球。当HAuCl_4)进一步增加至6 ml时,观察到一些破裂的微球。 X射线衍射结果显示,当样品中的HAuCl_4升高时,金的高强度尖峰出现。电流置换反应后,样品中钴含量下降,而金含量上升。这可以从能量色散X射线分析光谱中看出,也可以从热重分析结果中看出。中空的Au / Co微球在紫外可见测量中显示出两个宽的等离子体峰。添加HAUCl_44后,较长波长的等离激元峰移至近红外区域。

著录项

  • 来源
    《Military operations research》 |2012年第6期|493-500|共8页
  • 作者单位

    School of Materials and Mineral Resources Engineering, Engineering campus, Universiti Sains Malaysia, 14300 Nibong Tebal, Penang, Malaysia;

    School of Materials and Mineral Resources Engineering, Engineering campus, Universiti Sains Malaysia, 14300 Nibong Tebal, Penang, Malaysia;

    School of Materials and Mineral Resources Engineering, Engineering campus, Universiti Sains Malaysia, 14300 Nibong Tebal, Penang, Malaysia;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    cobalt; gold; bimetallic; hollow microsphere;

    机译:钴;金;双金属空心微球;

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