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首页> 外文期刊>Chemistry: A European journal >Seed-mediated synthesis of Au nanocages and their electrocatalytic activity towards glucose oxidation
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Seed-mediated synthesis of Au nanocages and their electrocatalytic activity towards glucose oxidation

机译：种子介导的金纳米笼的合成及其对葡萄糖氧化的电催化活性

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摘要

We report a modified seedmediated approach for the synthesis of uniform Au nanocages (AuNCs). HAuCl4 was reduced in an aqueous mixture of hexamethylenetetramine (HMT), poly(N-vinyl-2-pyrrolidone) (PVP), and AgNO _3. The nanocages were (54.6 ± 13.3) nm in outer-edge length and about 12 nm in wall thickness. The structure of the AuNCs was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), Fourier-transform infrared (FTIR) spectroscopy, and X-ray photoelectron spectroscopy (XPS). Morphological changes associated with the seed-mediated growth of Au nanoparticles (AuNPs) in the absence of HMT or PVP were examined. The results demonstrate that both PVP and HMT play important roles in the formation of the nanocage structure. The function of AgNO_3 was also studied. A possible formation mechanism for the AuNCs was investigated by monitoring TEM images of the Au nanostructures formed at various reaction times. The electrocatalytic activity of the AuNCs towards the oxidation of glucose was explored, and a nonenzymatic glucose sensor with high sensitivity and good stability was further fabricated. To the best of our knowledge, this is the first report of the preparation of AuNCs by a seed-mediated strategy and of the application of AuNCs in the electrocatalytic oxidation of glucose. Our results should facilitate the creation of novel nanomaterials with various morphologies and the exploration of their applications in nanotechnological, optical, catalytic, and materials science fields.
机译：我们报告了改良的种子介导的方法，用于合成均匀的Au纳米笼（AuNCs）。 HAuCl4在六亚甲基四胺（HMT），聚（N-乙烯基-2-吡咯烷酮）（PVP）和AgNO_3的水性混合物中还原。纳米笼的外边缘长度为（54.6±13.3）nm，壁厚约为12 nm。 AuNCs的结构通过扫描电子显微镜（SEM），透射电子显微镜（TEM），X射线能量色散光谱（EDS），X射线衍射（XRD），傅里叶变换红外（FTIR）光谱和X射线光电子能谱（XPS）。在没有HMT或PVP的情况下，检查了与种子介导的Au纳米颗粒（AuNPs）生长相关的形态学变化。结果表明，PVP和HMT在纳米笼结构的形成中都起着重要作用。还研究了AgNO_3的功能。通过监测在不同反应时间形成的Au纳米结构的TEM图像，研究了AuNCs可能的形成机理。探索了AuNCs对葡萄糖氧化的电催化活性，并进一步制备了具有高灵敏度和良好稳定性的非酶葡萄糖传感器。据我们所知，这是首次通过种子介导的策略制备AuNCs以及AuNCs在葡萄糖的电催化氧化中的应用的首次报道。我们的结果应有助于创建具有各种形态的新型纳米材料，并探索它们在纳米技术，光学，催化和材料科学领域的应用。

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