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Fabrication of core-shell Ge-GeO2 nanoneedles

Pei L. Z., Zhao H. S., Tan W., Yu H.Y., Zhang Q. F.

Materials Science Poland

2010

Vol. 28, No. 1

77--84

Core-shell Ge-GeO2 nanoneedles were prepared by a hydrothermal deposition using Ge and GeO2 as starting materials. The samples were characterized by scanning electron microscopy, energy dispersive X-ray spectroscopy, transmission electron microscopy and high-resolution transmission electron microscopy. The results demonstrate that the length of the samples with typical needle structure is higher than 10 žm. The obtained nanoneedles are composed of single crystalline Ge with diamond cubic structure and amorphous oxide outer layers. An explanation of the formation and growth of Ge nanoneedles is proposed, and is based on the metallic-catalyst vapour-liquid-solid and oxide-assisted growth mechanisms.

Silicon oxide nanowires and spheres grown by hydrothermal deposition

Pei L. Z.

Materials Science Poland

2009

Vol. 27, No. 1

339--347

Silicon oxide nanowires and spheres were prepared via a simple hydrothermal deposition using silicon powder as the starting material. Field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), energy dispersive spectra (EDS) and high-resolution transmission electron microscopy (HRTEM) were used to observe the structure and morphologies of the products. The results show that the average diameter of silicon oxide nanowires with an amorphous structure is about 500 nm, and that smooth silicon oxide spheres have a definite diameter distribution ranging from several hundred nanometers to several micrometers. The growth process of the silicon oxide nanowires and spheres is discussed.