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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25nm。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。
Under the action of ultrasonic field, chlorauric acid was used as a precursor, and sodium monoxide and tannic acid were used to reduce the monolayer of gold nanoparticle on the mica substrate. The prepared gold colloids were characterized by scanning probe microscopy, scanning electron microscopy and X-ray diffraction. The results show that the distribution of ultrasonic field and ultrasonic power have a great influence on the morphology of gold nanoparticles. The gold particles prepared in standing wave field are spindle-shaped. With the increase of ultrasonic power, the average aspect ratio of spindle-shaped gold particles decreases In the diffusion field, monodispersed spherical gold nanoparticles were obtained. The XRD and SEM measurements showed that the average grain size of gold was 25 nm. The gold nanoparticles can be assembled into a film before and after treatment, but the treated mica has a larger surface coverage.