One-Step Hydrothermal Formation of Bi2O3 Nanourchins with Radially Ultrathin Nanotubes

概要

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A novel Bi2O3 urchin-like microarchitecture with high-density radially oriented Bi2O3 nanotubes (NTs) was fabricated by a one-step hydrothermal approach without any template or surfactant at a relative low temperature of 90 °C. The radial Bi2O3 NTs on the surface of nanourchins (NUs) were 4–7 nm in diameter and ${\sim}1.7$ μm in length. The mean wall thickness of the NTs was as thin as 1.5 nm. Based on the time-dependent evolutions of morphology examined by scanning electron microscope (SEM), a “rolling-up mechanism” was demonstrated to explain the formation of the ultrathin Bi2O3 NTs. The ultrathin and long NTs bring on the high surface-to-volume ratios of the Bi2O3 urchin-like microarchitectures, which makes them great potential applications in gas sensors, photocatalysis, environmental purification, and solar energy conversion.
2010-09-15