Tungsten oxide (WO ), a new alternative to conventional semiconductor material, has attracted numerous attentions owning to its widespread potential applications. Various methods have been reported for the synthesis of WO nanostructures such as nanowires or nanodots. However, templates or surfactants are often required for the synthesis, which significantly complicate the process and hinder the broad applications. Herein, one-pot template/surfactant-free solvothermal method is proposed to synthesize the WO nanostructures including fluorescent quantum dots (QDs) and bundle-like nanowires simultaneously. The as-prepared WO QDs can be well dispersed in aqueous medium, exhibit excellent photoluminescent properties, and show an average size of 3.25 ± 0.25 nm as evidenced by transmission electron microscopy. Meanwhile, the diameter of the WO nanowires is found to be about 27.5 nm as manifested by the scanning electron microscope images. The generation mechanism for these two WO nanostructures are systematically studied and proposed. The WO QDs have been successfully applied in efficient fluorescent staining and specific ferric ion detection. Moreover, the WO nanowires can be utilized as effective dielectric materials for electromagnetic wave absorption.

Titanium dioxide (TiO2) has been densely investigated owing to its low cost, benign nature and strong photocatalytic ability. Thus, TiO2 has broad applications including photocatalysts, Li-ion batteries, solar cells, medical...

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