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首页> 外文期刊>Materials science & engineering >Deciphering the interaction of solvents with dual emissive carbon dots: A photoluminescence study and its response for different metal ions
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Deciphering the interaction of solvents with dual emissive carbon dots: A photoluminescence study and its response for different metal ions

机译：解读溶剂与双发射碳点的相互作用：光致发光研究及其对不同金属离子的响应

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摘要

Carbon-based fluorescent quantum dots exhibited tunable photoluminescence (PL) property which is mainly dependent on its excitation wavelength which is an important factor required for optoelectronic and sensing applications. Here, we have established a microwave-based synthesis of dual emissive carbon quantum dots (CDs) using mixed-acid (H3PO4 + H2SO4) and mono/disaccharides as carbon precursor. In aqueous medium, CDs showed dual emission peaks at 434 nm and 518 nm, which exhibited excitation independent fluorescence property with particle size in the range of 4-7 nm. Furthermore, its photophysical properties were explored in different solvents. The astonishing bathochromic shift was observed in its emission wavelengths with the decrease in polarity of the solvents. Moreover, the metal sensing efficacy of CDs was explored in these solvent systems. It exhibited utmost selectivity for Fe(III) ions in both the organic and aqueous medium with maximum and minimum detecting limit of 1 mu M and 0.4 mu M respectively. These experimental results were also validated through real samples (Ferric citrate tablets 200 mg) and it showed excellent metal ion sensing accuracy for CDs in different media. The fundamental motive of this work was to explain the role of the mixed acid for the development of dual emissive CDs using a single precursor. The solvatochromic and sensing properties of CDs were explored in various solvents, which could be useful for sensing applications.
机译：碳基荧光量子点表现出可调节的光致发光（PL）特性，该特性主要取决于其激发波长，这是光电和传感应用所需的重要因素。在这里，我们已经建立了使用混合酸（H3PO4 + H2SO4）和单糖/二糖作为碳前体的双发射碳量子点（CD）的微波合成方法。在水性介质中，CD在434 nm和518 nm处显示双发射峰，显示出与激发无关的荧光特性，粒径在4-7 nm范围内。此外，在不同溶剂中探索了其光物理性质。随着溶剂极性的降低，在其发射波长上观察到了惊人的红移。此外，在这些溶剂系统中还探索了CD的金属感测功效。它在有机和水性介质中对Fe（III）离子都表现出最大的选择性，最大和最小检测限分别为1μM和0.4μM。这些实验结果也通过真实样品（柠檬酸铁片200 mg）进行了验证，对于不同介质中的CD，其金属离子传感精度也很高。这项工作的基本动机是解释混合酸在使用单一前体开发双发射CD方面的作用。在各种溶剂中探索了CD的溶剂化和感测特性，这可能对感测应用有用。

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