Acid-assisted hydrothermal synthesis of red fluorescent carbon dots for sensitive detection of Fe(III)
Acid-assisted hydrothermal synthesis of red fluorescent carbon dots for sensitive detection of Fe(III)
复制标题
酸辅助水热合成红色荧光碳点用于灵敏检测 Fe(III)
DOI：
10.1039/c7ra06223k
复制
发表时间：
2017-01-01
期刊：
影响因子：
3.9
通讯作者：
He, Sailing
中科院分区：
文献类型：
--
作者：
Tan, Chunlin;Su, Xiuya;He, Sailing
以对苯二胺（p-PD）水溶液为原料，在硝酸（HNO3）的辅助下，在200℃、2 h的条件下水热反应合成了红发碳点（C-dots）。不同的酸体系，如HNO3、H3PO4和HF都可以直接合成发红的c点，并且可以通过增加酸的强度来增强荧光。在稀HNO3中制备的平均尺寸为3.46 nm的N-CDs C-dots，产量率为15.8%，在红光区（600 nm和680 nm）具有独特的、与激发波长无关的发射，具有较宽的可见激发带。c点表面的羧基、酯基和羟基直接导致红色发射。N-CDs对Fe3+检测具有一定的选择性特异性，线性范围为10 ~ 300 nmol L-1，检测限为1.9 nmol L-1。
Red-emitting carbon dots (C-dots) were synthesized from p-phenylenediamine (p-PD) aqueous solution with nitric acid (HNO3) assistance by hydrothermal reaction at 200 degrees C for 2 h. p-PD aqueous solution can be transferred to C-dots (or poly(p-PD)) with (or without) the addition of acid. Different acid systems, such as HNO3, H3PO4 and HF, can directly synthesize red-emitting C-dots, and the fluorescence can be enhanced by increasing the strength of acids. N-CDs, 3.46 nm-average-sized C-dots, prepared in dilute HNO3, have a quantum yield of 15.8% with unique, excitation-wavelength independent emission in the red region (600 and 680 nm) and a broad visible excitation band. Carboxyl, ester and hydroxyl groups on the C-dots surface directly lead to red emission. N-CDs have a certain selective specificity for Fe3+ detection and the linear range is 10-300 nmol L-1 with a limit of determination of 1.9 nmol L-1.