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Covalent conjugation of carbon dots with Rhodamine B and assessment of their photophysical properties

机译：碳点与罗丹明B的共享缀合，并评估它们的光物理性质

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摘要

The unique photoluminescent properties of carbon dots (CDs) continue to encourage a great interest in their development for a wide range of applications in energy conversion, optoelectronics or sensing. Engaging carbon dots in resonance energy transfer processes with organic dyes could enable the design of functional materials to greatly enhance the performance of solar cells and other optoelectronic devices, or to create new types of sensors. In this work, CDs were functionalized with Rhodamine B (RhB) isothiocyanate, (CD-PEG(1500N)-Rh) via a simple procedure after surface modification of bare carbon nanoparticles with poly(ethylene glycol) bis(3-aminopropyl) (PEG(1500N)). The morphology of CD-PEG(1500N) was ascertained using HR-TEM while the covalent linkage of Rhodamine B at the surface of PEG(1500N) capped CDs was proved by spectroscopic analysis. The overlap between the emission spectra of CDs and the absorption spectrum of RhB molecules favoured fluorescent (Forster) resonance energy transfer (FRET) from the CDs to the dye molecules. The FRET mechanism was firstly demonstrated by steady-state fluorescence measurements and its efficiency was estimated by photoluminescence lifetime measurements, using the time correlated single photon counting (TCSPC) method with the excitation of picosecond pulse lasers. The synthetic accessibility and the transfer efficiency of these conjugates make them reliable candidates for fluorescent materials to be later used in FRET based sensing platforms and photovoltaic devices.
机译：碳点（CDS）的独特的光致发光性质继续鼓励它们发展为广泛的能量转换，光电或传感应用了极大的兴趣。在与有机染料共振能量转移过程啮合碳点可以使功能性材料的设计，以极大地提高太阳能电池和其他光电器件的性能，或产生新的类型的传感器。在这项工作中，光盘用若丹明B（罗丹明B）异硫氰酸酯官能化的，（CD-PEG（1500N）-Rh）通过与聚（乙二醇）裸的碳纳米颗粒的表面改性后的简单过程双（3-氨基丙基）（PEG （1500N））。 CD-PEG（1500N）的形态使用HR-TEM，而在PEG（1500N）封端的CD的表面若丹明B的共价键是由光谱分析证实确定。 CD的发射光谱和罗丹明B分子的吸收光谱之间的重叠青睐从光盘荧光（福斯特）共振能量转移（FRET）的染料分子。该FRET机制首先通过稳态荧光测量表明其效率是由光致发光寿命测量估计，使用与相关皮秒脉冲激光的激发单光子计数（TCSPC）方法的时间。合成可达性和这些共轭物的转印效率使它们可靠候选荧光材料在基于FRET传感平台和光伏器件以后使用。

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  • 来源
    《RSC Advances》 |2015年第95期|共8页
  • 作者

    Diac Andreea; Focsan Monica; Socaci Crina; Gabudean Ana-Maria; Farcau Cosmin; Maniu Dana; Vasile Eugeniu; Terec Anamaria; Veca L. Monica; Astilean Simion;

  • 作者单位

    Univ Babes Bolyai Fac Chem &

    Chem Engn Cluj Napoca 400084 Romania;

    Univ Babes Bolyai Laser Microspect &

    Nanobiophoton Ctr Interdisciplinary Res Inst Bionanosci Cluj Napoca 400084 Romania;

    Univ Babes Bolyai Fac Chem &

    Chem Engn Cluj Napoca 400084 Romania;

    Univ Babes Bolyai Laser Microspect &

    Nanobiophoton Ctr Interdisciplinary Res Inst Bionanosci Cluj Napoca 400084 Romania;

    Univ Babes Bolyai Laser Microspect &

    Nanobiophoton Ctr Interdisciplinary Res Inst Bionanosci Cluj Napoca 400084 Romania;

    Univ Babes Bolyai Laser Microspect &

    Nanobiophoton Ctr Interdisciplinary Res Inst Bionanosci Cluj Napoca 400084 Romania;

    Univ Politehn Bucuresti Fac Appl Chem &

    Mat Sci Dept Sci &

    Engn Oxide Mat &

    Nanomat Bucharest 011061 Romania;

    Univ Babes Bolyai Fac Chem &

    Chem Engn Cluj Napoca 400084 Romania;

    IMT Bucharest Natl Inst Res &

    Dev Microtechnol Bucharest 077190 Romania;

    Univ Babes Bolyai Laser Microspect &

    Nanobiophoton Ctr Interdisciplinary Res Inst Bionanosci Cluj Napoca 400084 Romania;

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