2013年11月7日
Size-Dependent Luminescence Properties of Chromatographically-Separated Graphene Quantum Dots
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- 記述言語
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- 機関テクニカルレポート，技術報告書，プレプリント等
We studied the photoluminescence (PL) properties of graphene quantum dots<br />
(GQDs) separated by size-exclusion high performance liquid chromatography. The<br />
size separation of GQDs was confirmed by transmission electron microcopy<br />
images. PL excitation maps of chromatographically-separated GQDs show four<br />
distinct emission peaks at 330, 440, 520, and 600 nm, respectively. The<br />
dominant luminescence features of the separated GQDs show discrete change<br />
depending on the overall size of GQDs, indicating that PL variation occurs<br />
because of differences in density, shape, and size of sp2 fragments available<br />
in the GQDs. On the basis of the experimental results of PL peak wavelength and<br />
pH dependence, the emission is attributed to quasi-molecular PL from the<br />
fragments composed of a few aromatic rings with oxygen containing functional<br />
groups.
(GQDs) separated by size-exclusion high performance liquid chromatography. The<br />
size separation of GQDs was confirmed by transmission electron microcopy<br />
images. PL excitation maps of chromatographically-separated GQDs show four<br />
distinct emission peaks at 330, 440, 520, and 600 nm, respectively. The<br />
dominant luminescence features of the separated GQDs show discrete change<br />
depending on the overall size of GQDs, indicating that PL variation occurs<br />
because of differences in density, shape, and size of sp2 fragments available<br />
in the GQDs. On the basis of the experimental results of PL peak wavelength and<br />
pH dependence, the emission is attributed to quasi-molecular PL from the<br />
fragments composed of a few aromatic rings with oxygen containing functional<br />
groups.
- ID情報
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- arXiv ID : arXiv:1311.1684