In-situ heating study on the structural change of surfactant-templated germanium oxide mesostructure Article

Chen, X, Cai, Q, Wang, W et al. (2008). In-situ heating study on the structural change of surfactant-templated germanium oxide mesostructure . 112(39), 12297-12303. 10.1021/jp803407a



cited authors

  • Chen, X; Cai, Q; Wang, W; Mo, G; Jiang, L; Zhang, K; Chen, Z; Wu, Z; Wu, Z

fiu authors

abstract

  • Mesostructured germanium oxide has been well-synthesized by using a surfactant-templated approach under basic hydrothermal conditions. The cationic surfactant cetyltrimethylammonium bromide (CTAB) has formed nanotubes with uniform diameter of about 3.2 nm. Blanket-like morphology of the as-prepared sample has been observed with transmission electron microscopy (TEM). High-resolution TEM image reveals that the nanotubes are connected with inorganic germanium oxide and have self-assembled into periodic mesostructure. In-situ heating X-ray diffraction (XRD) patterns confirm that the germanium oxide is in amorphous phase in the temperature range from room temperature (RT) to 700 °C. In-situ heating small-angle X-ray scattering (SAXS) presents the mesostructural change with temperature. The local atomic structures around germanium atom have been obtained with in-situ heating X-ray adsorption fine structure (XAFS) techniques. The stability of this mesostructure has been determined to be correlated with the cationic surfactant CTAB. The structural evolution from the GeO2/NaOH aqueous solution, the as-prepared sample to the sample heated at 700 °C, has been described, and the formation mechanism of mesostructured germanium oxide has been discussed. © 2008 American Chemical Society.

publication date

  • October 2, 2008

Digital Object Identifier (DOI)

start page

  • 12297

end page

  • 12303

volume

  • 112

issue

  • 39