Liang Han-Pu, Wan Li-Jun, Bai Chun-Li, Jiang Li
Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China.
J Phys Chem B. 2005 Apr 28;109(16):7795-800. doi: 10.1021/jp045006f.
Uniform gold hollow nanospheres with tunable interior-cavity sizes were fabricated by using Co nanoparticles as sacrificial templates and varying the stoichiometric ratio of starting material HAuCl4 over the reductants. The formation of these hollow nanostructures is attributed to two subsequent reduction reactions: the initial reduction of HAuCl4 by Co nanoparticles, followed by the reduction by NaBH4. In addition, a thick layer of silica was successfully coated onto the gold hollow nanospheres. These nanostructures are extensively characterized by TEM, XRD, HRTEM, SEM, electron diffraction, energy-dispersive X-ray analysis, and UV-visible absorption spectroscopy. It is evident that the SPR peak locations corresponding to these hollow nanospheres are shifted over a region of more than 100 nm wavelength due to changes of shell thickness, which make these optically active nanostructures of great interest in both fundamental research and practical applications.
以钴纳米颗粒为牺牲模板，并改变起始原料四氯合金酸（HAuCl4）与还原剂的化学计量比，制备出了具有可调内腔尺寸的均匀金空心纳米球。这些空心纳米结构的形成归因于两个相继的还原反应：首先是钴纳米颗粒对四氯合金酸（HAuCl4）的还原，随后是硼氢化钠（NaBH4）的还原。此外，在金空心纳米球上成功包覆了一层厚厚的二氧化硅。通过透射电子显微镜（TEM）、X射线衍射（XRD）、高分辨透射电子显微镜（HRTEM）、扫描电子显微镜（SEM）、电子衍射、能量色散X射线分析和紫外可见吸收光谱对这些纳米结构进行了广泛表征。显然，由于壳层厚度的变化，这些空心纳米球对应的表面等离子体共振（SPR）峰位置在超过100nm波长的区域内发生了移动，这使得这些光学活性纳米结构在基础研究和实际应用中都备受关注。
