教師資料查詢 | 類別: 期刊論文 | 教師: 莊程豪 CHENG-HAO CHUANG (瀏覽個人網頁)

標題:The effect of thermal reduction on the photoluminescence and electronic structures of graphene oxides
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學期
出版(發表)日期2014/04/10
作品名稱The effect of thermal reduction on the photoluminescence and electronic structures of graphene oxides
作品名稱(其他語言)
著者CHENG-HAO CHUANG
單位
出版者
著錄名稱、卷期、頁數Scientific Reports 4, p.4525
摘要Electronic structures of graphene oxide (GO) and hydro-thermally reduced graphene oxides (rGOs) processed at low temperatures (120–180°C) were studied using X-ray absorption near-edge structure (XANES), X-ray emission spectroscopy (XES) and resonant inelastic X-ray scattering (RIXS). C K-edge XANES spectra of rGOs reveal that thermal reduction restores C = C sp2 bonds and removes some of the oxygen and hydroxyl groups of GO, which initiates the evolution of carbonaceous species. The combination of C K-edge XANES and Kα XES spectra shows that the overlapping π and π* orbitals in rGOs and GO are similar to that of highly ordered pyrolytic graphite (HOPG), which has no band-gap. C Kα RIXS spectra provide evidence that thermal reduction changes the density of states (DOSs) that is generated in the π-region and/or in the gap between the π and π* levels of the GO and rGOs. Two-dimensional C Kα RIXS mapping of the heavy reduction of rGOs further confirms that the residual oxygen and/or oxygen-containing functional groups modify the π and σ features, which are dispersed by the photon excitation energy. The dispersion behavior near the K point is approximately linear and differs from the parabolic-like dispersion observed in HOPG.
關鍵字
語言英文
ISSN2045-2322
期刊性質國外
收錄於
產學合作
通訊作者
審稿制度0
國別英國
公開徵稿
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