Synthesis and Characterization of Titania-Graphene Nanocomposites

被引：376

作者：

Lambert, Timothy N. ^{[1
]}

Chavez, Carlos A. ^{[1
]}

Hernandez-Sanchez, Bernadette ^{[2
]}

Lu, Ping ^{[3
]}

Bell, Nelson S. ^{[4
]}

Ambrosini, Andrea ^{[1
]}

Friedman, Thomas ^{[5
]}

Boyle, Timothy J. ^{[2
]}

Wheeler, David R. ^{[6
]}

Huber, Dale L. ^{[7
]}

机构：

[1] Sandia Natl Labs, Dept Mat Devices & Energy Technol, Albuquerque, NM 87185 USA

[2] Sandia Natl Labs, Dept Ceram Proc & Inorgan Mat, Albuquerque, NM 87185 USA

[3] Sandia Natl Labs, Dept Mat Characterizat, Albuquerque, NM 87185 USA

[4] Sandia Natl Labs, Dept Nanostructured & Elect Mat, Albuquerque, NM 87185 USA

[5] Sandia Natl Labs, Dept Nanomat Sci, Albuquerque, NM 87185 USA

[6] Sandia Natl Labs, Dept Biosensors & Nanomat, Albuquerque, NM 87185 USA

[7] Sandia Natl Labs, Dept CINT Sci, Albuquerque, NM 87185 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2009年 / 113卷 / 46期

基金：

美国能源部;

关键词：

EXFOLIATED GRAPHITE OXIDE; CARBON NANOTUBES; AQUEOUS DISPERSIONS; SURFACE-AREA; NANOSTRUCTURES; COMPOSITES; REDUCTION; TIO2; DEPOSITION; NANOSHEETS;

D O I：

10.1021/jp905456f

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

In this work, the synthesis and physiochemical characterization of titanium oxide nanoparticle-graphene oxide (TiO2-GO) and titanium oxide nanoparticle-reduced graphene oxide (TiO2-RGO) composites was undertaken. TiO2-GO materials were prepared via the hydrolysis of TiF4 at 60 degrees C for 24 h in the presence of air aqueous dispersion of graphene oxide (GO). The reaction proceeded to yield an insoluble material that is composed of TiO2 and GO. Composites were characterized by powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HR-TEM), Raman spectroscopy, N-2 adsorption-desorption, and thermal gravimetric analysis/differential thermal analysis (TGA/DTA). This approach yielded highly faceted anatase nanocrystals with petal-like morphologies on and embedded between the graphene sheets. At higher GO concentrations with no stirring of the reaction media, a long-range ordered assembly for TiO2-GO sheets was observed due to self-assembly. GO-TiO2 composites formed colloidal dispersions at low concentrations (similar to 0.75 mg/mL) in water and ethanol but were not amenable to forming graphene papers via filtration through Anodisc membranes (0.2 mu M pore diameter) due to their high titania concentration. Zeta potential measurements and particle size distributions from dynamic light scattering (DLS) experiments on these materials explain the stability of the TiO2-GO colloidal solutions. Chemical and thermal methods were also used to reduce TiO2-GO to give TiO2-RGO materials.

引用

页码：19812 / 19823

页数：12

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