Carbon Dots with Continuously Tunable Full-Color Emission and Their Application in Ratiometric pH Sensing
Carbon Dots with Continuously Tunable Full-Color Emission and Their Application in Ratiometric pH Sensing
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DOI：
10.1021/cm5003669
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发表时间：
2014-05-27
影响因子：
8.6
通讯作者：
Zhang, Sean Xiao-An
中科院分区：
文献类型：
--
作者：
Nie, Hui;Li, Minjie;Zhang, Sean Xiao-An
以氯仿和二乙胺为原料，通过温和的一锅法合成了两种不依赖于激发态的蓝光发射和依赖于激发态的全色发射的碳点。这一新的自下而上的合成策略导致了高度稳定的晶体C点，具有可调的表面功能，具有高重复性。通过对两种类型C点的详细表征和比较，具体证明了C=O和C=N等表面官能团可以有效地为电子跃迁引入新的能级，从而得到连续可调的全色发射。提出了一个简化的能级和电子跃迁图，以帮助理解表面官能团对发射性质的影响。通过利用独特的依赖于激发的全色发射，可以预期各种新的应用。本文以C点的两个发射波长为独立参照物，构建了比值pH传感器，以提高其可靠性和准确度，并将其应用于细胞内pH值的测量和癌症的诊断。
Two types of carbon dots (C dots) exhibiting respective excitation-independent blue emission and excitation-dependent full-color emissions have been synthesized via a mild one-pot process from chloroform and diethylamine. This new bottom-up synthetic strategy leads to highly stable crystalline C dots with tunable surface functionalities in high reproducibility. By detailed characterization and comparison of the two types of C dots, it is proved concretely that the surface functional groups, such as C=O and C=N, can efficiently introduce new energy levels for electron transitions and result in the continuously adjustable full-color emissions. A simplified energy level and electron transition diagram has been proposed to help understand how surface functional groups affect the emission properties. By taking advantage of the unique excitation-dependent full-color emissions, various new applications can be anticipated. Here, as an example, a ratiometric pH sensor using two emission wavelengths of the C dots as independent references has been constructed to improve the reliability and accuracy, and the pH sensor is applied to the measurement of intracellular pH values and cancer diagnosis.