Effect of particle size on the photochromic response of PWA/SiO2 nanocomposite
學年 99
學期 1
出版（發表）日期 2010-10-01
作品名稱 Effect of particle size on the photochromic response of PWA/SiO2 nanocomposite
作品名稱（其他語言）
著者 Huang, Feng-Hsi; Chen, Ching-Chung; Lin, Dar-Jong; Don, Trong-Ming; Cheng, Liao-Ping
單位 淡江大學化學工程與材料工程學系
出版者 Dordrecht: Springer Netherlands
著錄名稱、卷期、頁數 Journal of Nanoparticle Research 12(8), pp.2941-2950
摘要 A series of photochromic phosphotungstic acid (PWA)/SiO2 composites were synthesized using the sol-gel method. Depending on the feeding schedule of PWA during synthesis, the size of the formed PWA/SiO2 particles varied considerably from as small as 1.2 nm to ca. 10 nm. With decreasing silica particle size, the total contact area/interaction between SiO2 and PWA increases, as revealed by FT-IR and solid-state 29Si-NMR analyses. Particularly, when the size of PWA/SiO2 is ~1 nm, crystallization of PWA is inhibited, and PWA presents as amorphous molecular entities distributing uniformly in the SiO2 host, which is in evidence in the XRD spectroscopy and HR-TEM imaging. In contrast, substantial crystallization of PWA takes place when PWA/SiO2 particles are as large as 10 nm, in which case less amount of surface free Si-OH is available for PWA to make bonds with. Photochromism occurs activated by ultraviolet light irradiation. The rate of coloration/bleaching is found to depend strongly on the particle size of PWA/SiO2; specifically, the rate increases twice when the particle size is reduced from 10 nm to 1.2 nm.
關鍵字 Photochromism; Nanocomposite; Phosphotungstic acid; Silica; Crystallization; Optical display; Smart windows
語言 en
ISSN 1388-0764; 1572-896X
期刊性質 國外
收錄於 SCI
產學合作
通訊作者 Cheng, Liao-Ping
審稿制度
國別 NLD
公開徵稿
出版型式 紙本
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