Journal
APPLIED SURFACE SCIENCE
Volume 480, Issue -, Pages 404-409Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2019.02.097
Keywords
Hydrothermal; Tungsten oxide; Quantum dots; Photochromic; Oxygen-deficiency
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Funding
- National Natural Science Foundation of China [51572184, 51372160, 51402207]
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Tungsten oxide has attracted considerable attention as a typical photochromic material. Herein, a simple route for the synthesis of tungsten oxide quantum dots (WO3-x QDs) was demonstrated which was accomplished by the hydrothermal treatment of ammonium tungstate hydrate in the present of polyvinyl pyrrolidone (PVP). This photochromic material can rapidly undergo a color change reaction under the irradiation of ultraviolet or solar light. More importantly, the bleaching can be completed in a dark environment for 5 min and the cycle stability is excellent. The ultra-small size, existence of oxygen deficiency, and the surface modification by PVP are attribute to fast photochromic performance, excellent reversibility and cycling stability of WO3-x QDs.
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