Hydrothermal method represents a soft chemical procedure with high potential impact in the synthesis of new nanomaterials due to its versatility, ability to control nucleation and growth mechanisms and possibility to get nanomaterials in one step with lower energy consumption and low environmental impact than other synthesis routes.

An important feature of the hydrothermal method is the high potential in producing a wide range of doped oxide nanomaterials with controlled compositional and structural homogeneity at the nano level.

The first part of the paper presents the thermodynamic methods enabling controlling the synthesis process of doped oxide nanomaterials.

In the second part some examples are discussed are discussed based on original results regarding the hydrothermal synthesis of some functional doped oxide materials based on zirconia, barium strontium titanate and zinc oxides. The advantages and problems related to the hydrothermal synthesis of such nanomaterials are finally discussed.

Acknowledgements: Romanian Ministry for Education and Research in the frame of National Programme for New Materials, Micro and Nanotechnologies-MATNANTECH, Prof. Claude Monty from CNRS-PROMES, Prof. Witold Lojkowski from UNIPRESS Warsaw, EGIDE-France and ESF-COST Programme for supporting the researches.

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