Pattern Shape-Controlled Self-Assembly of Bi_(0.90)Si_(0.10) Nanocrystallites

摘要

Nanometer-sized Bi_(0.90)Sb_(0.10) has been, for the first time, prepared using a high-temperature organic solution reducing method. With the presence of proper capping and stabilizing agents, we were able to produce Bi_(0.90)Sb_(0.10) nanoparticles as small as ～12 nm. Nearly monodisperse distributions were obtained through a size-selective post treatment. Transmission electron microscope characterization reveals that the as-prepared particles have a highly crystalline single rhombohedral phase. Self-assembled patterns of Bi_(0.90)Sb_(0.10) were successfully achieved upon evaporation of the solvent from the nanoparticle colloids. As a step toward possible applications of these particles in thermoelectric device structures, we have also demonstrated that we are able to control the pattern of Bi_(0.90)Sb_(0.10) self-assembly from 2D to 1D by employing different solvent systems with varying ratios of polar and non-polar components.