Chemically Tailoring Coal to Fluorescent Carbon Dots with Tuned Size and Their Capacity for Cu(II) Detection
Chemically Tailoring Coal to Fluorescent Carbon Dots with Tuned Size and Their Capacity for Cu(II) Detection
复制标题
通过化学方法将煤定制为尺寸可调的荧光碳点及其用于 Cu(II) 检测的能力
DOI：
10.1002/smll.201401328
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发表时间：
2014-12-10
期刊：
影响因子：
13.3
通讯作者：
Qiu, Jieshan
中科院分区：
文献类型：
--
作者：
Hu, Chao;Yu, Chang;Qiu, Jieshan
对荧光碳点的尺寸、结构和光学性质的控制对于理解荧光机制和探索其潜在应用至关重要。本文报道了一种自上而下的策略，通过碳化和酸性氧化蚀刻的组合方法将廉价的煤化学定制为荧光CD。通过控制起始前体中石墨微晶的结构来调节所制得的CD的尺寸和光学性质。煤衍生的CD表现出两种不同的独特的发射模式，其中的短波长发射的强度显着增强的部分还原处理。电子结构的演化和表面态分析表明，两种不同类型的荧光中心，纳米尺寸的sp（2）碳域和表面缺陷，是负责所观察到的发射特性。还原的CD被证明是一种有效的荧光传感材料，可用于无标记和选择性检测铜（II）离子，检测限低至2.0纳米，在现实世界的传感器应用中显示出巨大的前景。
The desired control of size, structure, and optical properties of fluorescent carbon dots (CDs) is critical for understanding the fluorescence mechanism and exploring their potential application. Herein, a top-down strategy to chemically tailor the inexpensive coal to fluorescent CDs by a combined method of carbonization and acidic oxidation etching is reported. The size and optical properties of the as-made CDs are tuned by controlling the structures of graphitic crystallites in the starting precursor. The coal-derived CDs exhibit two different distinctive emission modes, where the intensity of the short-wavelength emission is significantly enhanced by partial reduction treatment. The evolution of the electronic structure and the surface states analysis show that two different types of fluorescence centers, nano-sized sp(2) carbon domains and surface defects, are responsible for the observed emission characteristics. The reduced CDs are demonstrated as an effective fluorescent sensing material for label-free and selective detection of Cu(II) ions with a detection limit as low as 2.0 nM, showing a great promise for real-world sensor applications.