TNTとTNPの識別のための新しい炭化ポリマードット設計戦略を開発（Researchers Develop New Design Strategy for Carbonized Polymer Dots to Discriminate Between TNT and TNP）

2025-04-22 中国科学院(CAS)

<関連情報>

• https://english.cas.cn/newsroom/research_news/chem/202504/t20250423_1041758.shtml
• https://www.sciencedirect.com/science/article/abs/pii/S030438942500860X?via%3Dihub

2,4,6-トリニトロトルエンと2,4,6-トリニトロフェノールの識別のための炭化ポリマードット Carbonized polymer dots for discrimination of 2,4,6-trinitrotoluene and 2,4,6-trinitrophenol

Ruiqi Qiao, Yingxing Li, Rongchao Zhu, Huazangnaowu Bai, Chuanfang Zhao, Baiyi Zu, Zhenzhen Cai
Journal of Hazardous Materials  Available online: 15 March 2025
DOI:https://doi.org/10.1016/j.jhazmat.2025.137944

Graphical Abstract

Highlights

• Regulation of the surface -NH₂ environments of CPDs to improve sensing performance.
• Fluorescent-colorimetric dual-mode discrimination of TNT and TNP from analogues.
• The synergy of FRET, PET and IFE triggered remarkable dual-mode responses.
• OPD/PEI CPDs (Wt_NH2=26.06 %) exhibited superior sensing performance for TNT and TNP.
• Paper sensor was explored for discriminating trace TNT and TNP particles and vapors.

Abstract

It is of great significance for the discrimination of 2,4,6-trinitrotoluene (TNT) and 2,4,6-trinitrophenol (TNP) from their analogues. Here, based on the electron-deficient properties of TNT and TNP, a series of o-phenylenediamine/polyethyleneimine carbonized polymer dots (OPD/PEI CPDs) with different densities and types of amine groups (-NH₂) on the surface were designed by modulating the ratio of the precursors OPD and PEI. The surface -NH₂ group of OPD/PEI CPDs could form a Meisenheimer complex with TNT, triggering the Forster resonance energy transfer, while forming hydrogen bonds with hydroxyl in TNP, triggering the charge transfer and spectral overlap to produce photoinduced electron transfer accompanied with inner filter effect. When the ratio of OPD to PEI is 1:1 and the surface -NH₂ content is 26.06 %, the OPD/PEI₁ CPDs demonstrated a more superior sensing performance toward targets, including a low limit of detection (TNT: 324 nM and 255 µM, TNP: 21.08 nM and 318.6 nM), a rapid response (<1 s), and a rather good selectivity in the presence of 20 interferents. Moreover, the practicality of the OPD/PEI₁ CPDs was further verified by an OPD/PEI₁ CPDs-based paper sensor, which is capable of discriminating TNT and TNP particles and vapors as low as pg-level and ppm-level respectively.