Electrical, Magnetic, and Optical Properties in Highordered Nanoparticle Supercrystals

Abstract

Recently, about nanoparticle research, control and applications of materials’ properties have been studied actively with developing synthesis skill and systematic advances such as controllable nanoparticles’ shapes, growth mechanism, monodispersity, and stoichiometry. However, the most established one was limited singular nanoparticle property research only and simple nanoparticles spread on the substrates. Here, we will introduce the new concept of materials or elements which show different properties from individuals using superlattices; periodically stacked or assembled by monodiserse nanoparticles. Each electrical, magnetic and optical properties was measured using PbS, CoFe2O4, and CdSe nanoparticles made by hot-injection method. In this paper, we will show results of the artificial 3D nano-structures self-assemble structure, which can be controlled by solvent evaporation ratio, surface control of nanoparticles, and so on. Also, we have studied the effect of nanoparticles’ stoichiometry, size, and shape for superlattice growth, and compared electrical, magnetic, and optical properties of superlattices with one of individual. ⓒ 2014 DGIST