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Nearly Monodisperse Graphene Quantum Dots Fabricated By Amine-assisted Cutting And Ultrafiltration.
Qi Xue, He Huang, Liang Wang, Zhiwen Chen, Minghong Wu, Zhen Li, Dengyu Pan
Published 2013 · Materials Science, Medicine
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We report a novel procedure involving polyethylenimine-assisted hydrothermal cutting and subsequent ultrafiltration for fabricating nearly monodisperse graphene quantum dots with a uniform lateral size and confined layer number. The isolated monolayer quantum dots exhibit a sharp band-edge absorption feature and strong photoluminescence (quantum yield of 21%) independent of excitation wavelength and pH. Their preliminary application in bioimaging has been demonstrated.
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