Luminescent graphene quantum dots fabricated by pulsed laser synthesis.
Luminescent graphene quantum dots fabricated by pulsed laser synthesis.
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DOI：
10.1016/j.carbon.2013.07.084
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发表时间：
2013-11
期刊：
影响因子：
10.9
通讯作者：
Morell G
中科院分区：
文献类型：
--
作者：
Habiba K;Makarov VI;Avalos J;Guinel MJ;Weiner BR;Morell G
石墨烯由于其独特的电学、光学和机械性能，近年来一直是人们研究的热点。此外，预计石墨烯的量子点将由于其结构和组成而进入设备，这些结构和组成统一了石墨烯和量子点的性质。石墨烯量子点（GQD）是具有几个原子层厚的平面纳米薄片，并且具有比相同尺寸的球形碳量子点（CD）更高的表面积与体积比。我们已经开发了一种脉冲激光合成（PLS）方法，用于合成可溶于水的GQD，其宽度为2-6 nm，厚度约为1-3层。它们在可见光区显示出很强的固有荧光。荧光的来源可以归因于各种因素，例如：量子限制、锯齿形边缘结构和表面缺陷。暴露于GQD的细菌的共聚焦显微镜图像显示其作为高对比度生物成像中的生物标志物和纳米探针的适用性。
Graphene has been the subject of intense research in recent years due to its unique electrical, optical and mechanical properties. Furthermore, it is expected that quantum dots of graphene would make their way into devices due to their structure and composition which unify graphene and quantum dots properties. Graphene quantum dots (GQDs) are planar nano flakes with a few atomic layers thick and with a higher surface-to-volume ratio than spherical carbon dots (CDs) of the same size. We have developed a pulsed laser synthesis (PLS) method for the synthesis of GQDs that are soluble in water, measure 2–6 nm across, and are about 1–3 layers thick. They show strong intrinsic fluorescence in the visible region. The source of fluorescence can be attributed to various factors, such as: quantum confinement, zigzag edge structure, and surface defects. Confocal microscopy images of bacteria exposed to GQDs show their suitability as biomarkers and nano-probes in high contrast bioimaging.