期刊
ACS APPLIED MATERIALS & INTERFACES
卷 8, 期 22, 页码 14019-14028出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b04115
关键词
photochromism; tungsten oxide; cation self-diffusion; sol-gel; xerogel
资金
- Japan Society for the Promotion of Science (JSPS) [24750069, 16K05817]
- Grants-in-Aid for Scientific Research [24750069, 16K05817] Funding Source: KAKEN
depended exclusively on a variety of alkali-metal cations present in the hybrid xerogel system. Furthermore, a detailed analysis of the self-diffusion mechanism confirmed that the alkali-metal cations electrostatically interact with a layer of unreacted silanol groups on the TESPMA/TEOS matrix surface,and subsequently pass through the interconnected pore network of the hybrid xerogel. More interestingly, in the context of an Arrhenius analysis, we found a good coincidence between the activation energies for alkali-metal cation self-diffusion and UV-induced coloration in the WO3/TESPMA/TEOS hybrid xerogel system containing the corresponding alkali-metal sulfate. It is experimentally obvious that the photochromic properties are dominated by the diffusion process of alkali-metal cations in the WO3/TESPMA/TEOS hybrid xerogel system. Such hybrid materials with cation controlled photochromic properties will show promising prospects' in applications demanding energy-efficient smart windows and smart glasses. Silicon oxycarbide/silica composites with well-dispersed tungsten(VI) oxide (WO3) nanoparticles were obtained as transparent hybrid xerogels via an acid-catalyzed sol gel process (hydrolysis/condensation polymerization) of 3-(triethoxysilyl)propyl methacrylate (TESPMA) and tetraethoxysilane (TEOS). The self-diffusion mechanism of alkali-metal cations and the kinetics of the photochromic-coloration process in WO3/TESPMA/TEOS hybrid xerogel systems have-been, systematically investigated. Under continuous UV. illumination, a gradual color change (colorless -> blue) corresponding to the reduction of W6+ into W5+ states in WO3 nanoparticles can be confirmed from the WO3/TBSPMA/TEOS hybrid xerogels containing alkali-metal sulfates, although:no coloration of the hybrid xerogel without alkali-metal sulfate was observed. The coloration behavior
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