一步生长合成具有催化活性的银花状球

One-Step Synthesis of Flower-like Silver Sphere with Catalytic Activity

通过改变加入硝酸的量在水溶液中一步生长合成银花状球。采用扫描电镜、X射线衍射、紫外可见吸收光谱对其进行分析表征。结果表明,所制得的银花状球结构由交错的微纳米片构成,且花状球结构的平均直径可在400 nm^1.5μm之间调节。研究发现,加入酸的量对产物的尺寸和形貌有决定性作用并基于此提出其生成机理。对比实验表明,银花状球对对硝基苯酚和硼氢化钠的反应具有催化活性,速率常数为369.8 s^(-1)·g^(-1)。

Flower-like Ag sphere structure was synthesized via a one-step reaction in aqueous solution by changing the amount of nitric acid added, and characterized by scanning electron microscope （SEM）, X-ray diffraction （XRD） and ultraviolet-visible （UV-Vis） spectroscopy. The results showed that the product was composed of staggered silver nanoplates and the average diameter could be adjusted accurately from 400 nm to 1.5 μm. The amount of nitric acid had crucial effect on the size and morphology of the flower-like Ag sphere structure and accordingly a plausible formation mechanism was proposed. Contrast experiments revealed that flower-like Ag sphere diaplayed catalytic activity in the reaction of p-nitrophenol with sodium borohydride at a rate constant of 369.8 s^-1·g^-1.