Identifying the fluorescence of graphene oxide
Identifying the fluorescence of graphene oxide
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DOI：
10.1039/c2tc00234e
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发表时间：
2013-01
影响因子：
6.4
通讯作者：
H. R. Thomas;C. Vallés;R. Young;I. Kinloch;N. Wilson;J. Rourke
中科院分区：
文献类型：
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作者：
H. R. Thomas;C. Vallés;R. Young;I. Kinloch;N. Wilson;J. Rourke
用氢氧化钠处理氧化石墨烯（GO）将材料分离成两种组分：无色但高度荧光的氧化碎片和含有石墨烯样片的较暗的非荧光材料。所产生的GO显示出弱的、宽的光致发光，而氧化碎片发出更强烈的荧光，相对于所产生的GO蓝移，随着激发波长降低，色散发射分布向较低波长偏移。这种激发波长相关的光致发光是纳米尺寸的碳基荧光团的集合的特征。相比之下，对所产生的氧化石墨烯的荧光作为激发波长的函数的分析显示出单个非色散峰，这与来自石墨烯片内的单个物质而不是量子点系综的发射的加宽一致。
Treatment of graphene oxide (GO) with sodium hydroxide separates the material into two components: a colourless, but highly fluorescent, oxidative debris and a darker non-fluorescent material containing the graphene-like sheets. The as-produced GO shows a weak, broad photo-luminescence while the oxidative debris fluoresces more intensely, blue-shifted relative to the as-produced GO, with a dispersive emission profile shifting to lower wavelength as the excitation wavelength is decreased. Such excitation wavelength dependent photoluminescence is characteristic of ensembles of nanometre-sized carbon based fluorophores. By contrast, analysis of the fluorescence as a function of excitation wavelength for as-produced graphene oxide shows a single non-dispersive peak, consistent with broadening of the emission from a single species rather than an ensemble of quantum dots within the graphene sheet.