Seed-mediated synthesis of Au nanocages and their electrocatalytic activity towards glucose oxidation.
Seed-mediated synthesis of Au nanocages and their electrocatalytic activity towards glucose oxidation.
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DOI：
10.1002/chem.200903552
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发表时间：
2010-08
期刊：
影响因子：
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通讯作者：
Yue Zhang;Fugang Xu;Yujing Sun;Cun-Yue Guo;K. Cui;Yan Shi;Zhiwei Wen;Zhuang Li
中科院分区：
文献类型：
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作者：
Yue Zhang;Fugang Xu;Yujing Sun;Cun-Yue Guo;K. Cui;Yan Shi;Zhiwei Wen;Zhuang Li
我们报道了一种改进的种子介导法来合成均匀的Au纳米笼(AuNC)。在六亚甲基四胺(HMT)、聚N-乙烯-2-吡咯烷酮(PVP)和硝酸银(3)的水溶液中，HAuCl4被还原。纳米笼外缘长度为(54.6+/-13.3)nm，壁厚约为12 nm。用扫描电子显微镜、透射电子显微镜、X射线能谱、X射线衍射仪、傅立叶变换红外光谱、X射线光电子能谱等手段对其结构进行了表征。在没有HMT或PVP的情况下，研究了与种子介导的Au纳米颗粒(AuNPs)生长相关的形态变化。结果表明，PVP和HMT在纳米笼结构的形成中起着重要作用。并对AgNO(3)的作用进行了研究。通过监测不同反应时间形成的Au纳米结构的透射电子显微镜图像，探讨了Au纳米结构的可能形成机理。研究了AUNCs对葡萄糖氧化的电催化活性，并进一步制备了灵敏度高、稳定性好的非酶葡萄糖传感器。据我们所知，这是首次报道用种子介导法制备AuNCs，并将其应用于葡萄糖的电催化氧化。我们的结果将有助于创造具有不同形貌的新型纳米材料，并探索其在纳米技术、光学、催化和材料科学领域的应用。
We report a modified seed-mediated approach for the synthesis of uniform Au nanocages (AuNCs). HAuCl(4) 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.