Coal-derived nitrogen, phosphorus and sulfur co-doped graphene quantum dots: A promising ion fluorescent probe
Coal-derived nitrogen, phosphorus and sulfur co-doped graphene quantum dots: A promising ion fluorescent probe
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煤源氮、磷、硫共掺杂石墨烯量子点：一种有前途的离子荧光探针
DOI：
10.1016/j.apsusc.2018.03.156
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发表时间：
2018
影响因子：
6.7
通讯作者：
Cao Yan
中科院分区：
文献类型：
--
作者：
Xu Ying;Wang Shengnan;Hou Xiaoyan;Sun Zhe;Jiang Yong;Dong Zhongbing;Tao Quanbao;Man Jun;Cao Yan
以无烟煤为原料，采用湿化学加透析法一步法制备了N、P、S共掺杂石墨烯量子点。这种简易的氧化过程同时合成了石墨烯量子点，并在边缘掺杂了N，P和S原子或形成了GQD的官能团。X射线光电子能谱(XPS)证明了相关杂原子被成功地掺杂到GQD上。在X射线光电子能谱检测中，N、P和S在GQD上的局域掺杂量分别高达5.6%、3.7%和3.7%(原子)。拉曼光谱表明，在煤块向纳米GQD转变的过程中，所制备的GQD的缺陷或无序数量增加。不同煤种的石墨化度对GQD形成的影响表明，石墨化度过高或过低的原煤都不利于形成高质量的GQD。所制备的NPS-GQD具有良好的激发依赖荧光和对某些痕量金属的猝灭性能。因此，NPS-GQD用于去离子水和多元素分析基质中Pb2+的检测，具有较宽的线性检测范围(1-20 μM)和0.75 μM的检出限。
N, P, S co-doped graphene quantum dots (NPS-GQDs) were prepared via a one-step wet chemical plus dialysis method directly using anthracite coal as raw material. This facile oxidation process simultaneously synthesized graphene quantum dots (GQDs) and doped N, P and S atoms on edges or forming functional groups of GQDS. X-ray photoelectron spectroscopy (XPS) proved that the involved heteroatoms were successfully doped on GQDs. The local doping of N, P and S on GQDs can reach high levels as 5.6%, 3.7% and 3.7% (by atomic) during XPS detection, respectively. Raman spectra showed that the amount of defects or disorders of prepared GQDs increased during the transition of the coal hunk toward the nano-GQDs. The effect of graphitizing degree of applied coals (varied coal ranks) on the formation of GQDs implied that raw coals with too high or too low graphitizing degree were not optimizing for the formation of high-quality GQDs. The prepared NPS-GQDs showed excellent properties on the excitation-dependent fluorescence and the quench by some trace metals. Thus, the NPS-GQDs were applied to detect of Pb2+in both a DI water and a multi-elements analysis matrix, exhibited wide linear detection range (1–20 μM) and a detection limit of 0.75 μM.