纳米金属铜与纳米氧化锌之间相互作用的EPR和XPS研究

由于纳米材料独特的表面效应、电子效应及量子尺寸效应 ,已被广泛应用于各个领域 .有关纳米材料研究的报道很多 1～ 7] ,大部分是关于纳米材料的制备1～ 4 ] 及其特性研究 .对于纳米金属及纳米氧化物之间相互作用的研究迄今尚未见报道 .本文采用超声分散和机械研磨法物理混合纳米金属铜粉和纳米氧化锌 ,借助 EPR和 XPS技术对样品进行了表征 ,发现混合体系出现了 Cu2 + 的顺磁信号 ,Zn L3M4 5M4 5俄歇动能和 O1s的电子结合能亦发生了变化 ,表明纳米 Cu0 和纳米 Zn O之间存在相互作用 ,作用形式为 Cu— O—Zn.1　实验部分1 .1　样品…

Studies on the Interaction Between Cu Nanoparticles and ZnO Nanoparticles with EPR and XPS

The mixtures of Cu nanoparticles and ZnO nanoparticles were obtained with some physical methods, such as grinding and ultrasionic dispersion and characterized by EPR and XPS. The EPR results showed that no signal could be observed in the Cu EPR spectrum and only a signal g=1.961 appeared in the ZnO spectrum before they were mixed. After they were mixed, a special signal that could be attributed to Cu2+ was observed in the spectrum. The XPS results showed that the values of the kinetic energy of ZnL3M45M45 and O1s changed in the XPS spectrum of the mixture, indicating that Zn valance decreased. We could also find that a new O species appeared in the mixture. These results showed that there was some interaction between Cu nanoparticles and ZnO nanoparticle, and the model would be Cu—O—Zn.