教師資料查詢 | 類別: 期刊論文 | 教師: 董崇禮 CHUNG-LI DONG (瀏覽個人網頁)

標題:Operando x-ray spectroscopic observations of modulations of local atomic and electronic structures of color switching smart film
學年105
學期2
出版(發表)日期2017/04/19
作品名稱Operando x-ray spectroscopic observations of modulations of local atomic and electronic structures of color switching smart film
作品名稱(其他語言)
著者Y. R. Lu; T. Z. Wu; H. W. Chang; J. L. Chen; C. L. Chen; D. H. Wei; J. M. Chen; W. C. Chou; C. L. Dong
單位
出版者
著錄名稱、卷期、頁數Physical Chemistry Chemical Physics 19, p.14224-14229
摘要Smart windows, which change color in response to external stimuli, are extensively studied owing to their potential technological applications in sensors and their ability to reduce the energy consumed by buildings. Most related studies focus on the optical properties of smart color switching films that can control the transmission of light and that of heat independently. This study examines the vanadium pentoxide thin film as a model system of a color switchable window. A gasochromic thin film of V2O5 is fabricated using sol–gel spin coating. In operando soft X-ray absorption spectroscopy (XAS) at the V L-edge is used to determine the evolutions of the electronic and atomic structures of V2O5 thin film under gasochromic color switching. Analysis of the V K-edge with respect to crystalline structural symmetry and valence requires many reference samples, whereas the V L-edge, which involves V 3d orbitals of various symmetries, can provide information about the atomic/electronic structures without many reference samples. A new gas reaction in situ cell was developed to collect the total-electron-yield XAS. The total-electron-yield signal can provide more accurate information about atomic and electronic structures than can the fluorescence-yield signal, which typically exerts a saturation effect. Analytical results reveal that the gasochromic reaction changes the charge state and causes a local atomic structural deformation of the film. The suggestion has been made that in the reaction, the central vanadium atom within the octahedron moves closer to the basal plane such that the apical V–O bond becomes more symmetrical than the film before gasochromic coloration. Unlike the cell that is used for hard XAS, and for which only cation sites can be studied, this in situ gas cell enables the real-time studies of atomic/electronic structures at gas–solid interfaces from viewpoints of both cation and anion sites.
關鍵字
語言英文
ISSN
期刊性質國外
收錄於SCI;
產學合作
通訊作者
審稿制度
國別中華民國
公開徵稿
出版型式,電子版,紙本
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