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Dual-Emissive Carbon Quantum Dot-Tb Nanocomposite as a Fluorescent Indicator for a Highly Selective Visual Detection of Hg(II) in Water
ACS Omega ( IF 4.1 ) Pub Date : 2018-09-19 00:00:00 , DOI: 10.1021/acsomega.8b01159
Tapas Kumar Mondal 1 , Uttam Kumar Ghorai 2 , Shyamal K Saha 1
Affiliation  

We report very fast, green, and large-scale synthesis of amino-functionalized carbon quantum dots (CQDs) using a domestic microwave to investigate CQD-Tb-based dual emission for visual detection of toxic Hg2+. Citric acid and p-phenylenediamine are used as precursor materials to synthesize the CQD, which shows excitation-independent blue luminescence. To achieve the dual emission, Tb-containing CQD is synthesized in a very easy and cost-effective way. These dual-emissive fluorescent materials have been successfully used as a fluorescent indicator for visual detection of toxic Hg2+ metal ions. An instant color change from blue to green in the presence of a very low amount of Hg2+ under a UV lamp (λ365nm) is observed. The material is highly sensitive and selective toward detection of mercury ions in the presence of other metal ions. The photoluminescence quenching mechanism (photoinduced electron transfer process) has been explained using an electronic band diagram supported by zeta-potential and time-correlated single photon counting measurements.

中文翻译:

双发射碳量子点-Tb 纳米复合材料作为荧光指示剂,用于高选择性视觉检测水中的 Hg(II)

我们报告了使用家用微波炉非常快速、绿色和大规模合成氨基功能化碳量子点 (CQD),以研究基于 CQD-Tb 的双发射,用于视觉检测有毒 Hg 2+。以柠檬酸和对苯二胺为前驱体材料来合成 CQD,显示出与激发无关的蓝色发光。为了实现双重发射,以非常简单且经济有效的方式合成含Tb CQD。这些双发射荧光材料已成功用作荧光指示剂,用于目视检测有毒Hg 2+金属离子。在紫外灯(λ 365nm )下,在极少量的 Hg 2+存在下,观察到从蓝色到绿色的瞬间颜色变化。该材料对于在存在其他金属离子的情况下检测汞离子具有高度灵敏性和选择性。光致发光猝灭机制(光致电子转移过程)已通过 zeta 电位和时间相关单光子计数测量支持的电子能带图进行了解释。
更新日期:2018-09-19
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