SUPERCRITICAL HYDROTHERMAL SYNTHESIS OF ORGANIC-INORGANIC HYBRID NANOPARTICLES

摘要

We have de ve loped supercritic a l h ydrotherm al syn thesis method of nanopartic les. In th emethod, metal salt aqueous solution is mixed with high temperature water to rapidly increase thetem p er atu r e of th e metal sa lt solution an d thus redu ce th e r eaction s an d cr ys ta lli zat ion s during th eheating up period. By using this method, we succeeded in the continuous and rapid production ofnanocrystals.In this paper, we propose a new method to synthesize organic-inorganic fused materialsbased on the methods of supercritical hydrothermal synthesis. By introducing organic materials in areaction atmosphere of supercritical hydrothermal synthesis, nanoparticles whose surface wasmodified w ith or ga n i c materials were s ynthesized. In s up e r c r itica l sta te, water an d or ga n i c materialsform a homogeneous phase, which provides an excellent reaction atmosphere for the organicmodification of nanoparticles. Modification with bio-materials including amino acids was alsopossible. By changing organic modifiers, particle morphology and crystal structure were changed.This organic surface modification provides a various unique characteristics for thenanoparticles: Dispersion of nanoparticles in aqueous solutions, organic solvents or in liquidpolymers can be controlled by selecting hydrophilic or hydrophobic modifiers. Polymer-likematerials can be formed for the amino acid modified nanoparticles probably by the self-assembly ofamino acid.