Supercritical hydrothermal synthesis of organic-inorganic hybrid nanoparticles

Mousavand Tahereh; Seiichi Takami; Satoshi Ohara; Mitsuo Umetsu; Tadafumi Adschiri

doi:10.1117/12.601504

28 April 2005 Supercritical hydrothermal synthesis of organic-inorganic hybrid nanoparticles (Invited Paper)

Mousavand Tahereh, Seiichi Takami, Satoshi Ohara, Mitsuo Umetsu, Tadafumi Adschiri

Proceedings Volume 5705, Nanobiophotonics and Biomedical Applications II; (2005) https://doi.org/10.1117/12.601504
Event: SPIE BiOS, 2005, San Jose, CA, United States

Abstract

We have developed supercritical hydrothermal synthesis method of nanoparticles. In the method, metal salt aqueous solution is mixed with high temperature water to rapidly increase the temperature of the metal salt solution and thus reduce the reactions and crystallizations during the heating up period. By using this method, we succeeded in the continuous and rapid production of nanocrystals. In this paper, we propose a new method to synthesize organic-inorganic fused materials based on the methods of supercritical hydrothermal synthesis. By introducing organic materials in a reaction atmosphere of supercritical hydrothermal synthesis, nanoparticles whose surface was modified with organic materials were synthesized. In supercritical state, water and organic materials form a homogeneous phase, which provides an excellent reaction atmosphere for the organic modification of nanoparticles. Modification with bio-materials including amino acids was also possible. By changing organic modifiers, particle morphology and crystal structure were changed. This organic surface modification provides a various unique characteristics for the nanoparticles: Dispersion of nanoparticles in aqueous solutions, organic solvents or in liquid polymers can be controlled by selecting hydrophilic or hydrophobic modifiers. Polymer-like materials can be formed for the amino acid modified nanoparticles probably by the self-assembly of amino acid.

Citation Download Citation

Mousavand Tahereh, Seiichi Takami, Satoshi Ohara, Mitsuo Umetsu, and Tadafumi Adschiri "Supercritical hydrothermal synthesis of organic-inorganic hybrid nanoparticles (Invited Paper)", Proc. SPIE 5705, Nanobiophotonics and Biomedical Applications II, (28 April 2005); https://doi.org/10.1117/12.601504

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