Hydrothermal synthesis of nitrogen-doped carbon quantum dots from microcrystalline cellulose for the detection of Fe3+ ions in an acidic environment
Hydrothermal synthesis of nitrogen-doped carbon quantum dots from microcrystalline cellulose for the detection of Fe3+ ions in an acidic environment
复制标题
微晶纤维素水热合成氮掺杂碳量子点用于酸性环境中 Fe3 离子的检测
DOI：
10.1039/c7ra08400e
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发表时间：
2017-01-01
期刊：
影响因子：
3.9
通讯作者：
Liu, Shouxin
中科院分区：
文献类型：
--
作者：
Wu, Peng;Li, Wei;Liu, Shouxin
以微晶纤维素为碳源，乙二胺为氮掺杂剂，采用水热法合成了氮掺杂碳量子点（NCQD）。通过 FT-IR、TEM、XPS、UV-vis、XRD 和荧光发射光谱对合成的 NCQD 进行了表征。研究发现氮物质被有效地掺杂到 CQD 的碳骨架中。所得NCQD为平均直径为3.2nm的球形颗粒。此外，与 CQD 相比，NCQD 在酸性溶液中表现出更好的荧光发射性能和更高的量子产率。当用作荧光探针通过荧光猝灭检测Fe3+时，具有较高的选择性和灵敏度，在酸性环境中Fe3+的检测限低至0.21 nM。通过荧光衰减时间分析证明Fe3+对NCQDs的猝灭过程是动态猝灭。
Nitrogen-doped carbon quantum dots (NCQDs) have been synthesized by the hydrothermal method with microcrystalline cellulose as carbon source and ethylenediamine as nitrogen dopant. The synthesized NCQDs were characterized by FT-IR, TEM, XPS, UV-vis, XRD and fluorescence emission spectroscopy. It was found that nitrogen species were efficiently doped into the carbon framework of the CQDs. The obtained NCQDs were spherical particles with an average diameter of 3.2 nm. Furthermore, the NCQDs showed better fluorescence emission properties and higher quantum yield in acidic solution than CQDs. When used as a fluorescent probe for Fe3+ detection via fluorescent quenching, high selectivity and sensitivity were achieved, and the limit of detection of Fe3+ was as low as 0.21 nM in the acidic environment. The quenching process of NCQDs by Fe3+ was proved to be a dynamic quenching by using fluorescence decay times analysis.