Synthesis and optical properties of nitrogen and sulfur co-doped graphene quantum dots
Synthesis and optical properties of nitrogen and sulfur co-doped graphene quantum dots
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氮硫共掺杂石墨烯量子点的合成及光学性质
DOI：
10.1039/c4nj00965g
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发表时间：
2014-09-01
影响因子：
3.3
通讯作者：
Li, Xiao-Long
中科院分区：
文献类型：
--
作者：
Zhang, Ben-Xing;Gao, Hui;Li, Xiao-Long
以氧化石墨烯为原料，采用一步水热法制备了具有强蓝色发光的水溶性氮硫共掺杂石墨烯量子点（NS-GQD）。选择氨水和粉状硫作为氮源和硫源。分别结果表明，N和S原子均成功地嵌入到石墨烯的sp（2）杂化碳骨架中。在365 nm激发下，当N/S原子比为1：1.2时，可获得最大发射强度。与N掺杂的石墨烯量子点（N-GQD）相比，所制备的NS-GQD表现出更明亮的发光。S掺杂对提高NS-GQD的发光强度起着重要作用。此外，发光对高盐浓度具有特别的耐受性。由于这些优点，NS-GQD在生物成像、太阳能电池和离子检测方面有着广泛的潜在应用。
Strong blue luminescence and water-soluble nitrogen (N) and sulfur (S) co-doped graphene quantum dots (NS-GQDs) were fabricated via a one-step hydrothermal method using oxidized graphene. Ammonia and powdered S were selected as the source of N and S. respectively. The results indicated that both N and S atoms were successfully incorporated into the sp(2)-hybridized carbon framework of graphene. Under the excitation of 365 nm, the maximum emission intensity could be obtained with a 1:1.2 atomic ratio of N/S. The as-prepared NS-GQDs exhibited brighter luminescence compared with N-doped graphene quantum dots (N-GQDs). S-doping plays an important role in enhancing the emission intensity of NS-GQDs. In addition, the luminescence was exceptionally resistant to high salt concentration. Because of these virtues, there are extensive potential applications for NS-GQDs in bio-imaging, solar cells, and ion detection.