Aleksandrovic Vesna, Greshnykh Denis, Randjelovic Igor, Frömsdorf Andreas, Kornowski Andreas, Roth Stephan Volkher, Klinke Christian, Weller Horst
Institute of Physical Chemistry, University of Hamburg, Grindelallee 117, 20146, Germany.
ACS Nano. 2008 Jun;2(6):1123-30. doi: 10.1021/nn800147a.
The Langmuir-Blodgett technique was utilized and optimized to produce closed monolayers of cobalt-platinum nanoparticles over vast areas. It is shown that sample preparation, "dipping angle", and subphase type have a strong impact on the quality of the produced films. The amount of ligands on the nanoparticle's surface must be minimized, the dipping angle must be around 105 degrees , while the glycol subphase is necessary to obtain nanoparticle monolayers. The achieved films were characterized by scanning electron microscopy (SEM) and grazing incidence X-ray scattering (GISAXS). The electrical properties of the deposited films were studied by direct current (DC) measurements, showing a discrepancy to the variable range hopping transport from the granular metal model and favoring the simple thermal activated charge transport. SEM, GISAXS, as well as DC measurements confirm a narrow size distribution and high ordering of the deposited films.
利用并优化了朗缪尔-布洛杰特技术，以在大面积上制备钴-铂纳米颗粒的封闭单层膜。结果表明，样品制备、“浸渍角”和亚相类型对所制备薄膜的质量有很大影响。纳米颗粒表面的配体数量必须减至最少，浸渍角必须约为105度，而二醇亚相是获得纳米颗粒单层膜所必需的。通过扫描电子显微镜（SEM）和掠入射X射线散射（GISAXS）对所制备的薄膜进行了表征。通过直流（DC）测量研究了沉积薄膜的电学性质，结果表明其与颗粒金属模型中的可变范围跳跃输运存在差异，且有利于简单的热激活电荷输运。SEM、GISAXS以及DC测量证实了沉积薄膜具有窄尺寸分布和高有序性。
