Simultaneous Synthesis of WO3-x Quantum Dots and Bundle-Like Nanowires Using a One-Pot Template-Free Solvothermal Strategy and Their Versatile Applications

作者：Wang, Yao; Wang, Xiaoxia; Xu, Yuanhong^*; Chen, Tao; Liu, Mengli; Niu, Fushuang; Wei, Shuang; Liu, Jingquan^*

来源：Small, 2017, 13(13): 1603689.

DOI：10.1002/smll.201603689

• ELECTROMAGNETIC-WAVE ABSORPTION
• NEAR-INFRARED ABSORPTION
• TUNGSTEN-OXIDE NANOWIRES
• GAS-SENSING PROPERTIES
• HYDROTHERMAL SYNTHESIS
• FACILE PREPARATION
• W18O49 NANOWIRES
• LARGE-SCALE
• PERFORMANCE
• GRAPHENE

Tungsten oxide (WO3-x), 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 WO3-x 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 WO3-x nanostructures including fluorescent quantum dots (QDs) and bundle-like nanowires simultaneously. The as-prepared WO3-x 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 WO3-x nanowires is found to be about 27.5 nm as manifested by the scanning electron microscope images. The generation mechanism for these two WO3-x nanostructures are systematically studied and proposed. The WO3-x QDs have been successfully applied in efficient fluorescent staining and specific ferric ion detection. Moreover, the WO3-x nanowires can be utilized as effective dielectric materials for electromagnetic wave absorption.

• 出版日期2017-4-4
• 单位青岛大学