| 초록 |
Drying of nanoparticle-containing dispersion is a versatile process in constructing self-assembled structure of nanoparticles, which are extensively studied for nanoscale devices. Here, we show liquid-phase TEM studies of nanoparticle self-assembly in real time under different conditions, including concentrations of the nanoparticle dispersion, types of nanoparticles, and types of substrates. The trajectories of individual nanoparticles was tracked to understand the formation mechanism of drying-mediated self-assembly at a single-particle level. The resulting trajectory consistently exhibit that a solvent boundary affects nanoparticle motions regardless of concentration of nanoparticles. The solvent boundary moves nanoparticles to construct 2D assembly through two pathways; dragging dispersed nanoparticles in lateral direction and flattening aggregated nanoparticles in vertical direction. |
