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Nano-Oxides and Hydroxides  With Low Dimension Structures for Application in Optoelectronic and Biomedical Engineering

Giang K. Lam 1Huong T. Tran 1Huong T. Nguyen 1Tuyen D. Le 1Trung T. Duong 1Binh T. Nguyen 1Anh K. Tran 1Strek Wieslaw 2Hui David 4Minh Q. Le 1,3

1. Institute of Materials Science (IMS), 18 Hoang Quoc Viet, Hanoi 8404, Viet Nam
2. Institute of Low tempearature and Structure, Polish Academy of Science, Wrocław 50-950, Poland
3. University of Technology, Vietnam National University, Hanoi 8404, Viet Nam
4. UNO-Laboratory of Composite, University of New Orleans, New Orleans 1234, United States


In this paper we present and review the effective route for synthesize the oxides and hydroxides  of nano-particles, -colloid, -rod, -tube from Y, Eu, Tb, Gd and Ti, Fe. The hydroxides and oxides of the above elements have been synthesized by using a polymer as soft template or derived from sol gel process via complexion.

The nanoparticles of Y2O3, Eu2O3, Tb4O7 and Gd2O3 have been prepared by using diethylene glycol. Nanoparticles of TiO2 derived from sol gel process via complexion. The nanocolloid of Fe3O4 obtained by co precipitation of Fe(II) and Fe(III) in starch or methylpolyethylenglycol.

The (Y,Tb) hydroxides nanorod, and tube have been prepared by using polyethylene glycol with the different molecular weights. The (Y,Tb) oxides nanotubes and rodes can be obtained by calcination of the hydroxides at 8000C. TiO2 nanorod and tubes have been obtained from complexion synthesis with tri(propylene glycol)diacrylate by using the sol gel process.

The methods of XRD, FESEM, TEM, EDS, and thermogravimetry have been employed to characterize these nanomaterials. The growth mechanism of  the above nanostructures could be curiously affected by a solution-solid process, anisotropic nanocrystal structures and incorporated with complexion agent or polymer conformation. Especially the transformation from nanorod to tube in reaction process has been observed well in the case of Y(OH)3 and TiO2.

The BET surface area data for Y(OH)3 nanotube,  139,26 m2/g, for TiO2 nanotube, 244,69 m2/g are much larger than that of nanoparticle or -rod, indicating that their hollow and tubular characteristics.

The magnetization and colloidal properties of (Fe,Gd) nanosuspensions were characterized to biocompatible materials for contrast enhancements in medical MRI.

The optical, spectroscopic, and  emission  of some nanophores: Y(OH)3: Eu, Tb ; Y2O3: Eu, Tb; Eu2O3; Tb4O7  as particles, colloid, rod and tube have been investigated for display, waveguide devices and active materials in coding card.


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Presentation: Invited at E-MRS Fall Meeting 2007, Acta Materialia Gold Medal Workshop, by Minh Q. Le
See On-line Journal of E-MRS Fall Meeting 2007

Submitted: 2007-07-02 17:04
Revised:   2009-06-07 00:44