One-pot synthesis of nanoscale carbon dots-embedded metal–organic frameworks at room temperature for enhanced chemical sensing
One-pot synthesis of nanoscale carbon dots-embedded metal–organic frameworks at room temperature for enhanced chemical sensing
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DOI：
10.1039/c6ta06403e
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发表时间：
2016-10
影响因子：
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通讯作者：
Longhua Xu;Guo-zhen Fang;Jifeng Liu;M. Pan;Ran Wang;Shuo Wang
中科院分区：
文献类型：
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作者：
Longhua Xu;Guo-zhen Fang;Jifeng Liu;M. Pan;Ran Wang;Shuo Wang
金属有机骨架材料以其独特的结构和性能，在许多领域有着广泛的应用前景。MOFs与其他材料的结合不仅使单相MOFs的力学和电学性能得到进一步的提高，而且令人惊讶地带来了许多新的功能，因此，这一领域引起了越来越多的研究兴趣，并开发了各种复合材料，包括MOFs-多孔碳，MOFs-碳纳米管，MOFs-石墨或氧化石墨烯，以及MOFs-碳纤维。在这项研究中，我们报告了一个高度发光的碳点嵌入金属有机框架（CDs@MOF）材料。通过将具有高量子产率的碳量子点（CD）引入到沸石咪唑酯骨架-8（ZIF-8）生长培养基中，经由简单的一锅法路线合成了CD @MOF复合物，这允许在反应期间将CD直接掺入骨架中。在本文中，ZIF-8被处理为吸收剂以选择性地捕获和富集靶分析物，并且CD被用作表面活性剂以选择性地和灵敏地感测ZIF-8与靶分子之间的键合相互作用，并进一步将这些化学事件标记为可检测的荧光信号。因此，所得的CD @ZIF-8对源自掺入的高荧光CD的槲皮素（QCT）表现出优异的荧光选择性和灵敏度，并且显示出对源自明确限定的微孔M0 F组分的QCT的富集，这进一步增加了荧光灵敏度。此外，QCT可在0.01-50.0 μM的宽浓度范围内检出，LOD低至3.5 nM。
Metal–organic frameworks (MOFs) with their unique features have attracted considerable attention as promising candidates for diversified applications. The integration of MOFs and other materials not only leads to further enhancement of single-phase MOFs in mechanical and electrical property, but also surprisingly brings out a number of new functionalities; therefore, increasing research interest has been aroused in this area, and a variety of composites, including MOF-porous carbon, MOF-carbon nanotube, MOF-graphite or graphene oxide, and MOF-carbon fiber, have been developed. In this study, we report a highly luminescent carbon dots-embedded metal–organic framework (CDs@MOF) material. The CDs@MOF composite was synthesized via a facile one-pot route by introducing carbon dots (CDs) with a high quantum yield into a zeolitic imidazolate framework-8 (ZIF-8) growth medium, which permitted the incorporation of CDs directly into the framework during the reaction. Herein, ZIF-8 was treated as absorbents to selectively capture and enrich the target analyte, and CDs were employed as a tentacle to selectively and sensitively sense the bonding interactions between ZIF-8 and target molecules and further transduce these chemical events to detectable fluorescence signals. Therefore, the resulting CDs@ZIF-8 exhibited excellent fluorescence selectivity and sensitivity toward quercetin (QCT) derived from the incorporated highly fluorescent CDs and showed enrichment for QCT that originated from the well-defined microporous MOFs component, which further increased the fluorescence sensitivity. Moreover, QCT could be detected in a wide concentration range of 0.01–50.0 μM with a low LOD of 3.5 nM.