writer：F. Geng,* Z. Zhao, J. Geng, H. Cong, H. Cheng,
keywords：hydrothermal synthesis
source：期刊
specific source：Mater. Lett. 2007, 61, 4794-4796
Issue time：2007年

Tubular α-FeOOH was synthesized via hydrothermal reaction at 120 °C. X-ray diffraction (XRD) pattern indicates that the as-prepared sample is the pure orthorhombic phase α-FeOOH. Fourier transform infrared (FT-IR) analysis further confirms the formation of orthorhombic phase α-FeOOH. The morphology and structure of the as-obtained product were characterized by transmission electron microscopy (TEM) techniques. TEM images show a high degree of contrast between the bright central part and the darker edges, demonstrating the hollow core of the product. The obtained tubular α-FeOOH was ～10 nm in outer diameter and ～6 nm in inner diameter, respectively. High-resolution TEM image of one single nanotube shows the clearly resolved interplanar spacing of about 4.18 ?, which corresponds to the spacing between (110) planes of the orthorhombic-type α-FeOOH crystal. The room-temperature UV–Vis absorption spectrum of the tubular α-FeOOH nanostructures is presented