Au-Cu有序纳米颗粒阵列的构筑及其光学性能  

Fabrication of Au-Cu Ordered Metallic Nanoparticle Arrays and Their Optical Properties

作　　者：马洪伟 张洪华[2] 方继恒 刘曦 王塞北[1] 谢明[1] Ma Hongwei;Zhang Honghua;Fang Jiheng;Liu Xi;Wang Saibei;Xie Ming(Sate Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metal,Kunming Institute of Precious Metals,Kunming 650106,China;Jiangxi Key Laboratory of Materials Surface Engineering,angxi Science and Technology Normal University,Nanchang 330013,China)

机构地区：[1]昆明贵金属研究所稀贵金属综合利用新技术国家重点实验室,云南昆明650106 [2]江西科技师范大学江西省材料表面工程重点实验室,江西南昌330013

出　　处：《稀有金属》2020年第9期919-926,共8页Chinese Journal of Rare Metals

基　　金：国家重点研发计划项目(2017YFB0305700);国家自然科学基金项目(U1602275,U1602271,51707087);云南省重大科技专项项目(2018ZE011,2018ZE012,2018ZE022,2018ZE026)资助。

摘　　要：使用单层胶体晶体模板技术,结合物理气相沉积,热处理等方法,制备大面积(平方厘米量级)的二元合金Au-Cu纳米颗粒阵列。通过气-液界面自组装法在载玻片上制备单层聚苯乙烯(PS)胶体晶体球模板;使用SiO2片、石英片(5 mm×5 mm,10 mm×10 mm)打捞PS球模板;通过溅射沉积的方法,在单层PS球模板上沉积生长Au薄膜,沉积时间为80 s。然后在1100℃(空气氛围)温度下进行热处理获得单层有序非密排Au纳米颗粒阵列;以此为模板,同样方法依次沉积生长20,30,60,120 s的Cu薄膜,在900℃(N2+H2混合气氛)温度下进行热处理;从而得到大面积的球状单层有序非密排Au-Cu纳米颗粒阵列,再使用场发射扫描电镜(SEM)及附带的能谱仪(EDS)来分析阵列形貌及组分;通过X射线衍射仪(XRD)来分析物质的晶体结构和材料组成;最后利用紫外可见分光光度计分析合金组元与等离激元共振峰的峰位及强度的关联性。结果发现:随着合金组元成分Cu的增加,使得二元合金Au-Cu纳米颗粒的局域表面等离子体共振(LSPR)峰位红移,峰强逐渐削弱,其主要原因是Cu的介电常数与Au相比较高。因此,可以通过调节合金种类及组分来调控LSPR峰位,以满足其在不同领域使用的需求。Large-scale ordered binary alloyed Au-Cu nanoparticles arrays were fabricated by physical vapor deposition technology and heat treatment based on monolayer colloidal crystal template. Monolayer polystyrene(PS)colloidal crystal template were prepared by self-assembly method at gas-liquid interface,and then transferred to SiO2 and quartz wafer(5 mm × 5 mm,10 mm × 10 mm),followed by depositing Au film for 80 s onto them by sputtering deposition method. Ordered non-close-packed Au nanoparticles arrays were obtained after annealing at 1100 ℃(air atmosphere)for 2 h. The Au-Cu nanoparticles arrays were obtained using Au nanoparticles arrays described above as secondary template for depositing Cu film for different time,such as 20,30,60,120 s,by sputtering deposition method,followed by heat treatment at 900 ℃(N2+H2 mixed atmosphere). The morphology and phase structure of the Au-Cu nanoparticles arrays film were characterized by scanning electron microscope(SEM)and energy dispersive spectroscopy(EDS),respectively. The analysis of the crystal structure and material composition of a substance was conducted by X-ray diffraction(XRD),Finally,the relationship between the peak position as well as intensity of local surface plasmon resonance(LSPR)of the alloyed nanoparticles arrays was analyzed by ultraviolet visible spectrophotometer. The results showed that the position of LSPR became redshift with increase of Cu contents ascribed to the higher dielectric constant of Cu than that of Au. Therefore,it was possible to control the LSPR peak position by adjusting the kinds and components of the alloy to meet their applications in different fields.

关 键 词：单层胶体晶体模板 Au-Cu 热处理 磁控溅射沉积 有序非密排纳米阵列 局域表面等离子共振 

分 类 号：TK91[动力工程及工程热物理]