Cetyltrimethyl ammonium mediated enhancement of the red emission of carbon dots and an advanced method for fluorometric determination of iron(III),Microchimica Acta

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Cetyltrimethyl ammonium mediated enhancement of the red emission of carbon dots and an advanced method for fluorometric determination of iron(III)
Microchimica Acta ( IF 5.3 ) Pub Date : 2019-11-16 , DOI: 10.1007/s00604-019-3933-4
Te Li ₁ , Lianwu Xie ₂ , Ruiqing Long ₁ , Chaoying Tong ₁ , Ying Guo ₃ , Xia Tong ₁ , Shuyun Shi _{1,

2,

3} , Qinlu Lin ₂

Affiliation

Red-emissive carbon dots (CDs) were synthesized by one-step hydrothermal technique using citric acid (CA), and urea in N,N-dimethylformamide (DMF) solution. The CDs has an average diameter of 2.3 nm, excitation/emission maxima at 553/606 nm, and a low photoluminescence quantum yield (4%). Fluorescence is weakly quenched by the ions Fe3+, Hg2+, Cu2+, Co2+, Zn2+, Ca2+, Ni2+, and Pb2+. After addition of cetyltrimethyl ammonium ion (CTAB), electrostatic interaction between negatively charged CDs and CTAB causes the CDs to self-aggregate. The formation of CD/CTAB increases the average particle diameter to around 13 nm and enhances the quantum yield to 24%. The hydrophobic segments of CTAB twined into a network structure can selectively trap Fe3+ and then interact with surface groups of the CDs to cause quenching. The CD/CTAB nanoprobe enables fluorometric determination of Fe3+ with a linear response in the 0.10–10 μM concentration range and a 0.03 μM limit of detection. The probe was utilized for determination of Fe3+ in human serum samples, and satisfactory results were obtained. Graphical abstract Schematic representation of fluorometric analysis of Fe(III) ion by cetyltrimethyl ammonium ion (CTAB) mediated red emission carbon dots (CDs). The hydrophobic segments of CTAB twined into a network structure can selectively trap Fe(III) and then interact with surface groups of the CDs to cause quenching. Schematic representation of fluorometric analysis of Fe(III) ion by cetyltrimethyl ammonium ion (CTAB) mediated red emission carbon dots (CDs). The hydrophobic segments of CTAB twined into a network structure can selectively trap Fe(III) and then interact with surface groups of the CDs to cause quenching.

中文翻译：

十六烷基三甲基铵介导的碳点红色发射增强和铁（III）荧光测定的先进方法

使用柠檬酸 (CA) 和尿素在 N,N-二甲基甲酰胺 (DMF) 溶液中通过一步水热技术合成了红色发射碳点 (CD)。CD 的平均直径为 2.3 nm，最大激发/发射波长为 553/606 nm，光致发光量子产率低（4%）。荧光被 Fe3+、Hg2+、Cu2+、Co2+、Zn2+、Ca2+、Ni2+ 和 Pb2+ 离子弱淬灭。添加十六烷基三甲基铵离子 (CTAB) 后，带负电荷的 CDs 和 CTAB 之间的静电相互作用导致 CDs 自聚集。CD/CTAB 的形成将平均粒径增加到 13 nm 左右，并将量子产率提高到 24%。CTAB 的疏水链段缠绕成网络结构可以选择性地捕获 Fe3+，然后与 CD 的表面基团相互作用以引起淬火。CD/CTAB 纳米探针可在 0.10–10 μM 浓度范围内以线性响应和 0.03 μM 检测限对 Fe3+ 进行荧光测定。将该探针用于人血清样品中Fe3+的测定，取得了满意的结果。图形摘要通过十六烷基三甲基铵离子 (CTAB) 介导的红色发射碳点 (CD) 对 Fe(III) 离子进行荧光分析的示意图。CTAB 的疏水链段缠绕成网络结构可以选择性地捕获 Fe(III)，然后与 CD 的表面基团相互作用以引起淬灭。通过十六烷基三甲基铵离子 (CTAB) 介导的红色发射碳点 (CD) 对 Fe(III) 离子进行荧光分析的示意图。

更新日期：2019-11-16

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