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以六氯环三磷腈和4,4’-二羟基二苯砜为单体,通过一步沉淀聚合制备了环交联型聚磷腈荧光纳米纤维(PZS-NF),对其化学结构、形貌、热稳定性及荧光特性进行了表征;进一步以PZS-NF为荧光化学传感器,研究了其检测液相中苦味酸(PA)的性能,并探讨了检测机理.结果表明:PZS-NF的平均直径为80 nm,高度交联的有机-无机杂化结构赋予了其优异的热稳定性;纳米纤维在369 nm紫外光的激发下,在433 nm具有显著的荧光特性,对液相中的PA表现出了高灵敏、高效和高选择性的荧光猝灭响应;优异的检测性能缘于PZS-NF结构中具有大量富电子的氮原子,通过酸碱相互作用将PA分子富集到纳米纤维表面,从而有效促进了PZSNF与PA之间形成非荧光基态配合物,同时有利于PZS-NF向PA发生激发态能量转移.
Cycloconjugated polyphosphazene fluorescent nanofibers (PZS-NF) were prepared via one-step precipitation polymerization using hexachlorocyclotriphosphazene and 4,4’-dihydroxydiphenylsulfone as monomers. The chemical structure, Appearance, thermal stability and fluorescence characteristics of PZS-NF were studied.The PZS-NF was used as a fluorescence chemical sensor to study the detection of picric acid (PA) in the liquid phase and to explore the detection mechanism.The results showed that PZS-NF The mean diameter is 80 nm, and the highly cross-linked organic-inorganic hybrid structure gives its excellent thermal stability. The nanofibers have significant fluorescence properties at 433 nm under the excitation of 369 nm UV light, PA showed a highly sensitive, efficient and highly selective fluorescence quenching response; excellent detection performance due to a large number of electron-rich nitrogen atoms in the PZS-NF structure, PA molecules are enriched to nanofibers through acid-base interaction Surface, thus effectively promoting the formation of non-fluorescent ground state complexes between PZSNF and PA, and at the same time it is beneficial to the excited state energy transfer of PZS-NF to PA.