金纳米粒子在云母表面组装行为的研究

Research on Self-Assembly Behavior of Au Nanoparticles on Mica Surface

摘要:

在超声场作用下，以氯金酸为前驱物，经柠檬酸钠和单宁酸还原，在云母基底上组装分散均匀的金纳米粒子单层膜。利用扫描探针显微镜、扫描电子显微镜和X射线衍射等技术对制备的金胶体进行表征。结果表明：超声场分布和超声功率对金纳米粒子形貌影响较大，驻波场下制备的金粒子为纺锤形，而且随超声波功率的增大，纺锤形金粒子的平均长径比减小；而在扩散场中得到单分散的球形金纳米颗粒，XRD和SEM测试表明金的平均晶粒尺寸为25 nm。金纳米粒子在处理前后的云母表面均能组装成膜，但在处理后的云母表面覆盖度更大

Abstract:

Au nanoparticles prepared in ultrasonic field, were electrostatically assembled onto mica substrates treated with MnCl2 solution of certain concentration. Au nanoparticles were characterized by means of scan electron microscope (SEM), scan probe microscope (SPM) and X-ray diffraction (XRD). The results indicate that ultrasonic field distribution and power significantly influence the morphology of Au nanoparticles. Spindle Au nanoparticles were prepared in the standing wave field. The average aspect ratio decreases of the spindle Au nanoparticles with the ultrasonic power increasing. Monodispersed spherical Au nanoparticles were synthesized in the diffusion wave field. SEM and XRD results show that the average particle size is 25 nm. Au nanoparticals can self-assemble onto the mica surface with or without treatment, but they cover large areas on the treated mica