Li Shengjie, Ouyang Tianwen, Guo Xue, Dong Wenyue, Ma Zhihua, Fei Teng
School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun 130022, China.
Chongqing Research Institute, Changchun University of Science and Technology, Chongqing 401135, China.
Materials (Basel). 2023 Sep 28;16(19):6458. doi: 10.3390/ma16196458.
The cross-linked conjugated polymer poly(tetraphenylethene--biphenyl) (PTPEBP) nanoparticles were prepared by Suzuki-miniemulsion polymerization. The structure, morphology, and pore characteristics of PTPEBP nanoparticles were characterized by FTIR, NMR, SEM, and nitrogen adsorption and desorption measurements. PTPEBP presents a spherical nanoparticle morphology with a particle size of 56 nm; the specific surface area is 69.1 m/g, and the distribution of the pore size is centered at about 2.5 nm. Due to the introduction of the tetraphenylethene unit, the fluorescence quantum yield of the PTPEBP nanoparticles reaches 8.14% in aqueous dispersion. Combining the porosity and nanoparticle morphology, the fluorescence sensing detection toward nitroaromatic explosives in the pure aqueous phase has been realized. The Stern-Volmer quenching constant for 2,4,6-trinitrophenol (TNP) detection is 2.50 × 10 M, the limit of detection is 1.07 μM, and the limit of quantification is 3.57 μM. Importantly, the detection effect of PTPEBP nanoparticles toward TNP did not change significantly after adding other nitroaromatic compounds, indicating that the anti-interference and selectivity for TNP detection in aqueous media is remarkable. In addition, the spike recovery test demonstrates the potential of PTPEBP nanoparticles for detecting TNP in natural environmental water samples.
通过铃木微乳液聚合制备了交联共轭聚合物聚（四苯乙烯 - 联苯）（PTPEBP）纳米粒子。采用傅里叶变换红外光谱（FTIR）、核磁共振（NMR）、扫描电子显微镜（SEM）以及氮气吸附 - 脱附测量对PTPEBP纳米粒子的结构、形态和孔隙特征进行了表征。PTPEBP呈现出粒径为56 nm的球形纳米粒子形态；比表面积为69.1 m²/g，孔径分布集中在约2.5 nm。由于四苯乙烯单元的引入，PTPEBP纳米粒子在水分散体中的荧光量子产率达到8.14%。结合孔隙率和纳米粒子形态，实现了在纯水性相中对硝基芳香族炸药的荧光传感检测。用于检测2,4,6 - 三硝基苯酚（TNP）的斯特恩 - 沃尔默猝灭常数为2.50×10⁴ M⁻¹，检测限为1.07 μM，定量限为3.57 μM。重要的是，添加其他硝基芳香族化合物后，PTPEBP纳米粒子对TNP的检测效果没有明显变化，表明其在水性介质中对TNP检测的抗干扰性和选择性显著。此外，加标回收率测试证明了PTPEBP纳米粒子用于检测天然环境水样中TNP的潜力。
