摘要
通过修正的Mie理论分别对单金属Ag、单金属Cu和Cu核Ag壳纳米颗粒/玻璃复合材料的吸收光谱进行了理论计算。计算结果表明,对单金属Ag纳米颗粒/玻璃复合材料,Ag的吸收峰位于425nm左右,不随颗粒尺寸变化而发生偏移;对单金属Cu纳米颗粒/玻璃复合材料,Cu的吸收峰也不随尺寸变化发生偏移但强度较弱;对Cu核Ag壳纳米颗粒/玻璃复合材料,随着Ag壳厚度的增加,Ag的吸收峰有明显的红移现象,而Cu的吸收峰位不变。此外,采用离子交换法制备了双金属Ag-Cu纳米颗粒/玻璃复合材料,实验结果表明,在后续热处理条件相同的情况下,延长Ag离子交换时间,Ag纳米颗粒尺寸增大,吸收峰红移,与理论计算结果很好的吻合。
The optical absorption spectra of Ag nanoparticles/silicate glass composites,Cu nanoparticles/silicate glass composites and Ag-Cu nanoparticles/silicate glass composites were theoretically calculated respectively by modified Mie theory.The results show that the surface plasmon resonance（SPR） peak of Ag nanoparticles locates at 425nm in Ag nanoparticles/silicate glass composites,which does not shift with the size of Ag nanoparticles changing.In addition,although the SPR peak of Cu nanoparticles in Cu nanoparticles/silicate glass composites is weak,it does not shift.In Cu-Ag core-shell nanoparticles/silicate glass composites,however,the SPR peak of Ag nanoparticles is red-shifted with the thickness of Ag shell increasing,while the SPR peak of Cu nanoparticles does not shift yet.In addition,Ag-Cu bimetallic nanoparticles/silicate glass composite materials were fabricated by two-step ion-exchange,experimental results show that as the size of Ag nanoparticles increases during ion-exchanged process under the same thermal treatment condition,the SPR peaks are red-shifted which agrees well with the calculated results.
出处
《功能材料与器件学报》
CAS
CSCD
北大核心
2011年第1期114-119,共6页
Journal of Functional Materials and Devices
基金
国家自然科学基金资助(No.50672069)
上海市科委基础研究重点项目(No.08JC1419000)
