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Advanced Materials

Self-Assembly of SiO2 Nanowires and Si Microwires into Hierarchical Heterostructures on a Large Scale


  • This work was performed through the Special Coordination Funds for Promoting Science and Technology from MEXT, Japan. Supporting Information is available online at Wiley InterScience or from the author.


Novel hierarchical heterostructures made of Si core microwires covered by dense, aligned SiO2 nanowires that form multiple junctions to the cores, have been synthesized on a large scale (see Figure). The Si wires are single crystals with a diameter of ∼ 1–3 μm, whereas the SiO2 nanowires are amorphous with a diameter of ∼ 30–80 nm. The materials are envisaged as becoming important for optical fibers, low-dimensional waveguides, scanning near-field optical microscopes, and high-bandwidth optical signal processing devices.

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