稀土镧对薄膜中银纳米粒子的细化作用  

Miniaturization of lanthanum on silver nanoparticles in thin films

作　　者：许北雪[1] 吴锦雷[1] 邵庆益[1] 张兆祥[1] 刘惟敏[1] 薛增泉[1] 吴全德[1] 

机构地区：[1]北京大学电子学系,北京100871

出　　处：《物理学报》2002年第5期1103-1107,共5页Acta Physica Sinica

基　　金：国家自然科学基金 (批准号 :6 0 0 710 17);北京自然科学基金 (批准号 :2 992 0 19)资助的课题~~

摘　　要：通过更换基底材料 ,证实了稀土镧对Ag BaO薄膜中银纳米粒子的细化作用 .用Lewis Campbell的薄膜理论分析表明 ,稀土镧对银纳米粒子的细化作用机理是 ,基底吸附稀土镧增强了基底对银原子的等效吸附能和基底表面徙动激活能 ,使镧和银结合形成的复合小银粒子在基底表面的徙动扩散运动受到削弱 ,进而减少了相互团聚所致 .基底表面徙动激活能增量在 0 .0 4— 0 .0 7eV之间 ,相应的基底对银原子的等效吸附能增量在 0 .0 8— 0 .The Miniaturization of lanthanum on silver nanoparticles in Ag-BaO thin films has been confirmed by a change of material of substrate. Analysis based on the theory of Lewis-Campbell shows that, with the adsorption of lanthanum, the adsorption energy and activation energy for surface diffusion of the substrate increases, and the moving and diffusion of the composite nanoparticles of lanthanum, and silver are decreased. Thus the growth of nanoparticles via colliding and coalescing are decreased. The increment of activation energy for surface diffusion of the substrate is 0.04-0.07eV, and that of adsorption energy is 0.08-0.42eV.

关 键 词：稀土 粒度 镧 薄膜 银纳米粒子 细化作用 

分 类 号：O484[理学—固体物理] TB383[理学—物理]