金银纳米粒子—稀土氧化物复合薄膜的光吸收特性  

Photoabsorption Properties of the Thin Films Composed of Ag/Au Nanometer Particles and Rare-earth Oxides

作　　者：吴锦雷[1] 刘盛[1] 

机构地区：[1]北京大学电子学系,北京100871

出　　处：《贵金属》2003年第3期1-6,16,共7页Precious Metals

基　　金：国家自然科学基金资助项目 (60 0 710 17);国家 973资助项目 (2 0 0 1CB610 5 0 3 )

摘　　要：在真空中用蒸发沉积的方法制备了埋藏有Ag或Au纳米粒子的稀土氧化物复合薄膜 :Ag -La2 O3、Ag -Nd2 O3、Ag -Sm2 O3、Au -La2 O3、Au -Nd2 O3和Au -Sm2 O3。通过光吸收实验研究 ,发现这些薄膜都在光波长 31 0～ 1 2 0 0nm内出现吸收峰 ,Ag纳米粒子 -稀土氧化物薄膜和Au -Sm2 O3薄膜的光吸收峰位置随Ag或Au粒子粒径和数量的增加产生红移 ;而Au -La2 O3和Au -Nd2 O3薄膜的光吸收随Au量的增大变为金属性光吸收。分析表明 ,Ag或Au粒子与稀土氧化物之间的相互作用是影响光吸收峰位置的主要原因。The composite thin films, Ag-La_2O_3, Ag-Nd_2O_3, Ag-Sm_2O_3, Au-La_2O_3, Au-Nd_2O_3 and Au-Sm_2O_3, in which Ag/Au nanometer particles were embedded in rare-earth oxides, were deposited by vacuum evaporation. There were optical absorption peaks from the photoabsorption spectrograph in the range of the wavelength 310 ～1200nm. The optical absorption peaks shifted to the long wavelengths with increasing the amount and size of Ag/Au particles for the thin films composed of Ag particles and rare-earth oxides and Au-Sm_2O_3. While the optical absorption was changed to the metal optical absorption with increasing the Au amount for Au-La_2O_3 and Au-Nd_2O_3. We suggest that the absorption peak change results mainly from the interaction between the rare-earth oxide and the Ag/Au particles.

关 键 词：金 银 纳米粒子 稀土氧化物 复合薄膜 光吸收特性 功能材料 光电发射 

分 类 号：TB43[一般工业技术] TB34