Preparation of monodisperse SiO<sub>2</sub> nanorods with hollow structure and parameters affecting the length-diameter ratio
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Monodisperse SiO<sub>2</sub> nanorods with hollow structure were prepared using FeOOH as a template. Powder X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and nitrogen adsorption-desorption isotherms were utilized to characterize the products. With a FeCl<sub>3</sub> concentration of 0.1 M, the average length and width of the prepared hollow SiO<sub>2</sub> nanorods were 397 nm and 116 nm, respectively, and the average length-diameter ratio was calculated as 3.4. The average size of the nanopores of the amorphous SiO<sub>2</sub> shell were measured as 2.5 nm. Furthermore, increasing the concentration of Cl<sup>−</sup> ions improved length-diameter ratios of the FeOOH nanorod template and hollow SiO<sub>2</sub> nanorods.
