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Study on the fluorescence of double-emission carbon quantum dots by improved intercept method
Methods and Applications in Fluorescence ( IF 3.2 ) Pub Date : 2021-01-09 , DOI: 10.1088/2050-6120/abcbec
ZhiKun Gao 1 , Tongfan Hao 1 , Qunxiang Fang 1 , Changchun Wu 1 , Zhiping Zhou 1
Affiliation  

The fluorescence mechanism of dual-emission carbon quantum dots (DCQDs) is investigated by the improved intercept method, of which the DCQDs with high quantum yield are synthesized by hydrothermal method by using the precursor of sulfadiazine. The research of the morphology, chemical properties and fluorescence properties on DCQDs, shows that DCQDs have graphene-like structure and well-resolved lattice fringes, and that DCQDs fluorescence emission as well intensity has reversibility between acid and alkaline. Based on the ultraviolet absorption spectrum (UV–vis) of the DCQDs, the band gap of DCQDs is estimated by the improved intercept method. Then, the change law of DCQDs emission wavelength at different excitation wavelengths is studied by using the estimated band gap. It is found that the improved intercept method is well consisted with the emission change law of DCQDs at different excitation wavelengths. In addition, the influence of different concentration of Fe3+ on the estimated band gap of DCQDs shows that the Fe3+ has big influence on the band gap of 3.99 eV and 3.06 eV but almost no effect on band gap of 4.93 eV and 3.67 eV. It indicates that the quenching of Fe3+ to DCQDs may be due to the band gap caused by surface defect is changed by Fe3+. Also, DCQDs are used as probe to detect Fe3+ and used as spray ink. Thereby, the improved intercept method may provide a new direction for researching the fluorescence mechanism of carbon quantum dots.



中文翻译:

改进截距法研究双发射碳量子点的荧光

采用改进的截距法研究了双发射碳量子点(DCQDs)的荧光机理,其中以磺胺嘧啶为前驱体,采用水热法合成了具有高量子产率的DCQDs。对DCQDs的形貌、化学性质和荧光性质的研究表明,DCQDs具有类石墨烯结构和良好分辨的晶格条纹,并且DCQDs的荧光发射和强度在酸碱之间具有可逆性。基于DCQDs的紫外吸收光谱(UV-vis),通过改进的截距法估计DCQDs的带隙。然后,利用估计的带隙研究了DCQDs发射波长在不同激发波长下的变化规律。发现改进的截距法与DCQDs在不同激发波长下的发射变化规律吻合较好。此外,不同浓度Fe的影响DCQDs估计带隙的3+表明,Fe 3+对3.99 eV和3.06 eV的带隙影响很大,但对4.93 eV和3.67 eV的带隙几乎没有影响。这表明Fe 3+淬灭为DCQDs 可能是由于Fe 3+改变了表面缺陷引起的带隙。此外,DCQD 用作检测 Fe 3+的探针并用作喷墨。因此,改进的截取方法可为研究碳量子点的荧光机理提供新的方向。

更新日期:2021-01-09
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