化学还原法合成Cu纳米粒子分析

Synthesis of Cu Nanoparticles by Chemical Reduction Method

通过在室温下化学还原以简单的途径合成了铜纳米粒子,分别用硼氢化钠和聚乙烯吡咯烷酮还原并稳定了Cu^2+离子。评估了还原剂/前体盐(RA/PS)比的变化对CuNPs尺寸和形态的影响。合成材料通过紫外可见(UV-Vis)光谱,X射线衍射(XRD),扫描电子显微镜(SEM)和透射电子显微镜(TEM)。UV-Vis光谱显示在569nm处有一个CuNPs等离子体激元峰,在485nm处有另一个Cu_2O峰。XRD分析表明,fcc-Cu相含有少量的fcc-Cu2O化合物。SEM和TEM研究表明,当RA/PS比值是2.6的时候,获得的粒径大概是7nm半球形CuNPs,得到较大粒径多面体形Cu2O颗粒,最大的粒径为150nm。除此以外,于RA/PS比是1.66的时候,获得在其尖端具备量子限域效应的星形Cu2O粒子。

Copper nanoparticles were synthesized in a simple way by chemical reduction at room temperature,and Cu2+ions were reduced and stabilized with sodium borohydride and polyvinylpyrrolidone,respectively.The effect of changes in reducing agent/precursor salt(RA/PS)ratio on the size and morphology of Cu NPs was evaluated.The synthetic materials passed UV-Vis spectroscopy,X-ray diffraction(XRD),scanning electron microscope(SEM)and transmission electron microscope(TEM).UV-Vis spectrum showed a Cu NPs plasmon peak at 569nm and another Cu2O peak at 485nm.XRD analysis showed that the fcc-Cu phase contained a small amount of fcc-Cu2O compounds.SEM and TEM studies show that when the RA/PS ratio is 2.6,the obtained particle size is about 7nm hemispherical Cu NPs,and large-diameter polyhedral Cu2O particles are obtained with a maximum particle size of 150nm.In addition,when the RA/PS ratio is 1.66,star-shaped Cu2O particles having a quantum confinement effect at the tip are obtained.