Fluorescence resonance energy transfer fluorescent polymer dots without conventional chromophores: Synthesis, emission mechanism and applications as Cu2+ probe and fluorescent ink
- 发表刊物：Chemical Engineering Journal Advances
- 关键字：Emission mechanism
Non-aromatic fluorescent materials
Ion probe
Fluorescence internal filter effect
Fluorescence resonance energy transfer
Electronic transition
- 摘要：Recently, the non-aromatic fluorescent materials without benzene rings in their structures have aroused
widespread interest. In this work, a citric acid functionalized polyethyleneimine oligomer, CA-PEI, was synthesized through acyl chloride method. In CA-PEI, the polyethyleneimine was bonded to citric acid molecule with a
molar ratio of 1:1 through an amide bond, which was confirmed by NMR, FTIR, GPC and XPS. The results indicated that CA-PEI had dual excitation and dual emission properties, and the two emission centers were derived
from n–��∗ and n–��∗ transition, respectively. CA-PEI was used to synthesize the light-emitting polymer dots NPDs through a hydrothermal reaction. Interestingly, compared with CA-PEI, N-PDs had dual excitation and single
emission properties, and its Stoke’s shift was as high as 193 nm. This can be attributed to the compact structure of
N-PDs, which promoted the fluorescence resonance energy transfer (FRET) process. Importantly, N-PDs can serve
as excellent probes in response to Cu2+, with a detection limit as low as 2.5 nmol L−1. The response mechanism
involves the formation of a copper amine complex between Cu2+ and the PEI part of N-PDs, which then quenches
the fluorescence emission of N-PDs through the fluorescence inner-filter effect. N-PDs as well were applied as an
encryptable fluorescent ink.
- 论文类型：SCI
- 是否译文：否
- 发表时间：2020-10-29
- 收录刊物：SCI
