Madhukar Nikita, Adusumalli Venkata N K B, Koppisetti Heramba V S R M, Mondal Ayan, Ito Akitaka, Park Yong Ii, Mahalingam Venkataramanan
Graduate School Engineering, Kochi University of Technology, Kami, Kochi, 782-8502, Japan.
School of Chemical Engineering, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju, 61186, South-Korea.
Chem Asian J. 2024 Nov 18;19(22):e202400597. doi: 10.1002/asia.202400597. Epub 2024 Oct 16.
In this study, we have developed ligand-sensitized Ln-doped nanocrystals (NCs) for the selective sensing of CrO and MnO ions in nanomolar concentrations. This is accomplished with the gallic acid capped-CaF:Tb NCs. These NCs display bright green emission through an efficient energy transfer from surface functionalized gallic acid molecules to Tb ions upon UV light excitation. The luminescence from Tb ions are selectively quenched by the addition of CrO and MnO anions. The reduction in the luminescence intensity is found to be quite selective, as the addition of other strong oxidizing species (I, F, Br, Cl, PO , SO , VO , WO , IO , ClO ,) had minimal impact on the luminescence intensity of Tb ions. The calculated limit of detection from the experimental results (for the 3σ/slope criterion) is 77 nM and 55 nM for KCrO and KMnO respectively. The findings show that tuning the resonance energy transfer (RET) between analytes and Tb inside the NCs serves as a tool for the detection of dichromate and permanganate ions selectively.
在本研究中，我们开发了配体敏化的镧系掺杂纳米晶体（NCs），用于选择性检测纳摩尔浓度的CrO和MnO离子。这是通过没食子酸包覆的CaF:Tb NCs实现的。这些NCs在紫外光激发下，通过表面功能化的没食子酸分子向Tb离子的高效能量转移，发出明亮的绿色荧光。加入CrO和MnO阴离子后，Tb离子的发光被选择性猝灭。发现发光强度的降低具有很高的选择性，因为加入其他强氧化物种（I、F、Br、Cl、PO、SO、VO、WO、IO、ClO）对Tb离子的发光强度影响极小。根据实验结果（采用3σ/斜率标准）计算得出的检测限，对于KCrO和KMnO分别为77 nM和55 nM。研究结果表明，调节纳米晶体内分析物与Tb之间的共振能量转移（RET）可作为选择性检测重铬酸根和高锰酸根离子的一种手段。
