Nanostructured WO 3 films synthesized on mica substrate with novel photochromic properties
Journal of Alloys and Compounds(2016)
摘要
Herein, it is reported that ordered tungsten oxide WO3 films have been prepared on the natural mica substrate by a simple hydrothermal method. Under the mild hydrothermal environment, the mica substrate can still induce a WO3 compact layer with good epitaxial texture. The influence of precursor concentrations on the films are further discussed that changing precursor concentrations doesn't change the films' composition, but makes a great influence on the films' morphologies and photochromic properties. The XRD result reveals that the films are hexagonal WO3. As the precursor concentration (Cp) increases from 0.01 M to 0.14 M, the morphology of the films changes from six-pointed star nanostructure to lush grass nanostructure, irregular nanorods nanostructure, finally granule nanostructure and uneven flaky particles. The samples obtained with Cp = 0.10 M and Cp = 0.14 M absorb almost 100% of the incident UV light. Interestingly, a kind of novel absorption in the NIR range of 800–850 nm is observed with Cp = 0.10 M. The absorption range moves to the vis–NIR range of 680–850 nm when increases the Cp to 0.14 M. In this process, the sample obtained with Cp = 0.14 M exhibits the optimized photochromic performance due to the high crystallinity and huge exposed surface area.
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关键词
WO3 films,Mica substrates,Dual-wavelength excitation,Precursor concentrations
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