Supercritical synthesis of organic-monolayer modified nanocrystals and organic-inorganic hybrid nanomaterials

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(1) Mechanism and kinetics of hydrothermal reaction We analyzed the rate and equilibrium constant of chemical reaction between organic molecules and metal ions. The results are 1) Organic molecules and metal ions exist in the single phase, 2) Nucleation of metal oxide nanoparticle occurs due to reduced solubility, 3) Capping of the surface of metal oxide nanoparticles results in the growth rate of the nanoparticles, and 4) Surface-modified metal oxide nanoparticles are synthesized. We also found that the reaction of surface modification was controlled by the balance between the surface potential of metal oxide nanoparticles and the ionization of surface modifiers.(2) Development of supercritical synthesis of surface-modified metal oxide nanoparticles. We developed the supercritical synthesis of surface-modified metal oxide nanoparticles to produce surface-modified metal oxide nanoparticles. We separated the nanoparticle production step and the surface-modification step to optimize the degree of surface modification, size and shape of surface-modified metal oxide nanoparticles. We also elaborated the way of mixing the reactants supercritical water and successfully produced smaller nanoparticles.(3) Characterization of organic-inorganic interaction We evaluated the bonding mechanism of organic molecule and metal oxide nanoparticles. Thermogravimetry is used to evaluate the bonding energy, distance and coverage. The dynamics light scattering measurement was used to elucidate the degree of dispersion of surface-modified metal oxide nanoparticles.(4) Synthesis of organic-inorganic hybrid material We characterized the synthesized hybrid nanomaterials. and studied the effect of size and surface modification on the properties of metal oxide nanoparticles. Based on the above discussion, we proposed the guiding principles of hybrid-nanomaterials.